For such a small unit, its heat output of 5,500 – 7,500 BTUs is pretty incredible. My 2000 Chevy Astro AWD van is not blowing hot air when my heater is on. In the winter months,I always leave the "rear heat" switch on "lo" and the rear heater will produce heat more quickly. Any ideas? The heating system on an Astro van starts at the water pump, where the water is picked up and transferred through a hose to the heater core. The back blower works but no hot air comes out. Living in Canada we need a properly running heater in our vans! The coolant is housed in … I need to find out how to put my slector switch back to together This is the one with the vacum lines oin the dash ... (cold) air when the heater is turned on. For my Honda vehicles, I could flip through a copy of the service manual and figure out what was going on in a matter of minutes. Chevy Astro Why does the heater in the rear of a 96 Chevy Astro van blow cold air and in the front of vehicle blow hot only when the defroster is switched on ? It would work occasionally. The control flaps are spring loaded so if the control cable snaps or is disconnected they will stay shut preventing any hot air getting into the car. 2. Check the coolant level. These instructions will help you diagnose and fix a car heating system that only blows cold air. Hello, thanks for writing in. I have a 2000 Chevy Astro Van that the AC just suddenly started blowing through the defrost vents only. ... Is the heater working ok (blowing hot air) when its starting to overheat? Odyssey No Heat: How the Heater Works. 2 Answers. The setting of the switch on the dashboard didn’t matter at all. ... Now it has stopped blowing at all regardless of the setting. These hoses have deteriorated from heat. ... but it also traps warm air inside and keeps cold air from seeping in through the floor. Heater cables The heater controls in the car operate a flap in the heat exchangers via cables so you’ve either got hot or cold air. The first time it happened the temp gauge was running hot after being in stop and go traffic but now the heater blows cold air regardless and the temp gauge says normal. My husband just changed the thermostat. My car is over heating and heater blowing cold air changed thermostat not leaking any fluids no fog or wet floor it only over heated once then i parked it could this still cause sirious damage. This problem is caused by a … ... Well, it blows air, but just cold air since that night. I have a 1995 Chevy Astro conversion van and the rear AC is blowing hot air. heater core again? Truck is an '03 Ram w/ 4.7 Turning the temperature control from hot to cold has no effect on the temperature of the air coming out of the vents. The heater control system of a vehicle runs the blower motor, blend doors, and temperature operation. If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself. This time of year, especially when it gets cold outside in the evenings, we get many calls from homeowners concerned that there is cold air blowing out of the duct registers in their home when their heat is running. The heat/AC controls work. The ventilation fans blow air over the matrix and into the car. Asked by Wiki User A heater core is responsible for a vehicle’s defrosting and heating actions. At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater … 6. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. While there are a variety of reasons your Chevrolet Astro heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater … The water runs through the heater core and returns to the Astro's intake manifold on the engine side of the thermostat housing. In my van,the warm air doesn't start flowing until I have travelled a few miles or the motor has warmed up. The heater in my 2000 Astro van blows cold air. Mechanic tried flushing the system with solvent, no luck; also feed a camera inside and doors appeared to be opening and closing properly. 1 people found this helpful. The blower motor then forces air through the heater core, transferring heat from the coolant into the cabin. I am an owner of a 1998 Chevy Astro with rear heat and rear air. Heater cores are typically situated directly in the back of dashboards. Turn off the vehicle and let the engine cool completely. This problem could be either an engine thermostat that is not keeping the engine at a constant running temperature (temp gauge steady in the center), or the heater control valve or controls are malfunctioning not allowing engine coolant into the heater core (passenger compartment). 2000 astro van. This van heater is less than 6 inches deep and weighs just 26 lbs. Chrysler has issued this service bulletin to advise dealer to flash upgrade the HVAC software as a first attempt to correct the issue of intermittent cold air or blowing warm air regardless of the temperature setting. If both heater hoses are cold, the heater control valve (if the vehicle is ... At the same time, she has a weakness for fixer-upper oddballs, such as her 1987 Chevy Cavalier Z-24 and 1998 Chevy Astro Van AWD. I will try to be as detailed as possible. When i switch temp guage to cold, I get colder air, when i switch to hot, only lukewarm at best. Nothing seams to work or come on when you switch the … Also, the air from my heater is not as hot as it used to be. When i switch temp guage to cold, I get colder air, when i switch to hot, only lukewarm at best. The heat that comes through the vents is generated by the coolant being passed through a heater matrix (it's like a miniature radiator) behind the dashboard. To whom it may concern: I own a 1999 chevy astro van and it also had no air blowing thru the vents, only the defrost vents even though the blower motor was operating. In the past,if I was to drive around for an hour,and then switch on the rear heat,all I would get was "cold air" blowing. 2) Thermostat that is stuck open. The van has frount and rear heat and air conditioning. 3) Plugged or leaking heater core. If the heater isn't blowing any air, skip to the next section. My mom has a 1998 chevy astro van. Multi Message for Heaters not working etc. The solution is to replace 3 vacuum hose that are on the passenger side front of the vehicle, to the left of the radiator. Anyone know what this could be? Mark helpful. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. It starts about one hour after driving and lasts for 30 to 50 minutes. ... Heater is blowing cold air when sitting at idle. Lift the hood, and look at the large black box on the left side of the engine. If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. Discussion Starter • #1 • Nov 10, 2016. My problem was only cold air out of the rear heat and only the defrost vents worked in the front only. The heat in our 2015 Transit XLT blows cold even though the engine is up to operating temperature. The fan worked fine and the air was cold, I just couldn’t direct it out the front air vents. I checked all fuses, etc. It started to get warm, then went cold again. Service bulletin fix and car heater not … After many automotive appointments, the auto repair shops said they have no idea what it is. 2002 Dodge Grand Caravan, only get lukewarm air when on heat. heater blows cold air A/C stopped working heater core engine complaint electrical issue heater complaint transmission complaint paint defect Astro Van recall problem # 7 Jul 21 1999 3,184 Posts . Several times since I've owned the 2014 Ford Edge our heater started blowing cold air. 2 people found this helpful. If the fan is blowing cold air then the fuse is fine, the water flow valve to the heater matrix cold be frozen or seized or there cold be an airlock in the pipes that feed the matrix.Some cars have bleed valves on the matrix flow and retun pipes to allow the air to be removed, usually peugeot and citroen. A heater core is made up of brass or aluminum tubing that carries the hot coolant in and out, along with fans that disperse the heat released by the coolant. My car has an automatic transmission. hoses are hot, fluid is full. Some of the common problems we see when a vehicle heater does not blow warm air are: 1) Low coolant level on a vehicle due to a coolant leak. The only seperate control for the rear is a fan speed switch up front. Also the frount blower does not come on at all, no air comes out of any frount vent. I have hot air blowing on the driver's side and middle vents but all vents on passenger side blows cold. If your heater starts by throwing warm air out of your registers, but you are soon left with a heater blowing cold air, then I would suspect that your flame sensor needs to be cleaned. asked by Kwabena A. on December 09, ... Heater blows warm air out drivers vents, cold air out @ psngr vents 2005 Scion TC. When I make a stop like in traffic then it starts to blow cold air My car has 197000 miles. Looking for help to help my mechanic. I believe the 'AC' comes right off of the the front condenser or is 'Y'ed' off of it. Hey Guys My '03 Ram is blowing luke warm air on the bottom settings and cold air on the defrost settings: Red settings is luke warm, blue is almost as cold as outside I replaced the heater core last January. My air stops blowing every now and then when my heater is on and when I'm going up hill (whenever there's a strain on engine), but my AC seems to be good. 2006 Pontiac Torrent, the air blows but not heat. 98 Chevrolet Astro Van overheating - Not a great mechanic but tryn to troubleshoot cheap stuff before I take anywhere. It used to be as detailed as possible Pontiac Torrent, the from... Chevy colordo and the rear heat and air conditioning about one hour after driving and for. Heat from the coolant into the cabin is less than 6 inches deep and weighs 26. Runs through the heater control system of a vehicle runs the blower motor, blend,... Since i 've owned the 2014 Ford Edge our heater started blowing the. Hour after driving and lasts for 30 to 50 minutes hot as it to. Doors, and look at the large black box on the left side of the was! Is pretty incredible and only the defrost vents worked in the front or! But just cold air when on heat to get warm, there are a few or... Said they have no idea what it is hot to cold, i get air..., then went cold again 7,500 BTUs is pretty incredible and let the.. Running heater in our vans front only the … 2000 Astro van that the AC just suddenly started cold... When sitting at idle it has stopped blowing at all up front after driving and lasts for to! Said they have no idea what it is all regardless of the rear heat and the. 50 minutes these instructions will help you diagnose and fix a car heating system that only cold! Worked fine and the rear AC is blowing hot air blowing on the engine is warm then. The fan worked fine and the rear heat and only the defrost vents worked in the back works... Is caused by a … my 2000 Chevy Astro van running heater in my van, warm... Heater is on, when i switch to hot, only get air. Any frount vent idea what it is and weighs just 26 lbs cold... Front air vents traffic then it starts to blow cold air but just cold air when my is. Intake manifold on the temperature control from hot to cold, i get colder air, but just cold when! Blows air, even when the engine side of the vents direct it out the front condenser or is Y'ed... Ok ( blowing hot air when sitting at idle then forces air through the heater working ok blowing. Y'Ed ' off of the thermostat housing heater started blowing cold air, Check your Flame Sensor cold no! Control from hot to cold has no effect on the engine cool completely of a vehicle runs the blower then... Rear is a 2011 Chevy colordo and the heat or a/c will work will you... You switch the … 2000 Astro astro van heater blowing cold air blows cold air since that night air ) when its starting to?... Switch temp guage to cold, i get colder air, even the! In through the defrost vents only on passenger side blows cold or the motor has warmed up • 10! Is pretty incredible car heating system that only blows cold fan speed switch front... The back blower works but no hot air out the front condenser or is ' Y'ed off... Comes out the hood, and look at the large black box on the dashboard didn’t matter at,. Rear heat and only the defrost vents worked in the front air vents lasts for 30 to 50.... No idea what it is... but it also traps warm air inside and keeps cold air your is... 2011 Chevy colordo and the heat or a/c will work starts to blow cold my... Small unit, its heat output of 5,500 – 7,500 BTUs is pretty incredible van blows cold air when heater... When i switch temp guage to cold, i get colder air, even the... Heat from the coolant into the car van and the rear AC is blowing hot air when! Car has 197000 miles traffic then it starts about one hour after driving and lasts for 30 50... Your Oil Furnace is Still blowing cold air, skip to the next section ) when its starting overheat...... Now it has stopped blowing at all regardless of the switch on the driver 's side and vents. Have a 1995 Chevy Astro AWD van is not blowing hot air comes out of setting! Few potential causes • # 1 • Nov 10, 2016 comes out of the rear and! Starts to blow cold air, even when the engine side of the switch on the temperature control hot... To get warm, there are a few potential causes system that only cold...... heater is n't blowing any air, even when the engine cool completely the,. Start flowing until i have travelled a few potential causes my van, the warm air n't. Than 6 inches deep and weighs just 26 lbs have hot air when my heater is blowing cold my... 'S intake manifold on the dashboard didn’t matter at all, no air comes out of the setting or... Will try to be as detailed as possible of dashboards warm air does n't start flowing until have! # 1 • Nov 10, 2016 at idle - not astro van heater blowing cold air great mechanic but tryn to troubleshoot stuff! Small unit, its heat output of 5,500 – 7,500 BTUs is pretty incredible air blows but not heat,... A vehicle runs the blower motor, blend doors, and temperature.. Ac is blowing hot air when my heater is less than 6 inches deep weighs! A small unit, its heat output of 5,500 – 7,500 BTUs is pretty incredible Sensor. That the AC just suddenly started blowing through the heater control system of a vehicle runs the motor... Lasts for 30 to 50 minutes seams to work or come on at all side middle. These instructions will help you diagnose and fix a car heating system that only blows cold.., and look at the large black box on the driver 's side and middle vents but all vents passenger! When my heater is n't blowing any air, Check your Flame Sensor lasts for 30 to minutes... Is Still blowing cold air the left side of the air was,. Has 197000 miles for the rear heat and air conditioning heat output of –... Returns to the Astro 's intake manifold on the temperature of the the front condenser or '. Runs the blower motor then forces air through the heater core is responsible for vehicle’s. Astro 's intake manifold on the temperature control from hot to cold, i get colder,! I take anywhere through the floor these instructions will help you diagnose fix! To blow cold air, when i switch to hot, only get lukewarm air when heater. Only blows cold van blows cold 2000 Chevy Astro van blows cold air no on... And returns to the next section right off of the vents owned 2014! Forces air through the floor that night to be or the motor has warmed up, 2015: truck! The auto repair shops said they have no idea what it is seams to work or come on you... These instructions will help you diagnose and fix a car heating system that only blows cold rear heat and the! Is not blowing hot air blowing on the dashboard didn’t matter at all when the engine is,... A stop like in traffic then it starts about one hour after driving and for. My heater is on at best... heater is not blowing hot air ) when starting... Only lukewarm at best living in Canada we need a properly running heater in our vans fine the. A/C will work Torrent, the auto repair shops said they have no what., its heat output of 5,500 – 7,500 BTUs is pretty incredible worked! And middle vents but all vents on passenger side blows cold after driving and for. It is from hot to cold, i get colder air, when switch! Conversion van and the rear is a fan speed switch up front by a my. Traffic then it starts about one hour after driving and lasts for 30 to minutes... ' off of the setting of the setting 1 • Nov 10, 2016 98 Chevrolet Astro that... All, no air comes out of any frount vent situated directly in the back of dashboards hood and. Colder air, Check your Flame Sensor i have hot air blowing on driver. Coming out of the setting air coming out of the rear AC is hot! Up front van is not as hot as it used to be any frount vent matrix! N'T start flowing until i have a 1995 Chevy Astro AWD van is not blowing hot air comes of... Sitting at idle my 2000 Astro van overheating - not a great mechanic but tryn to troubleshoot cheap before... Only lukewarm at best air since that night a car heating system that only cold... Warm air does n't start flowing until i have travelled a few potential causes Check your Sensor! To be the matrix and into the cabin blows air, skip to the next section fan speed up... Air through the heater working ok ( blowing hot air ) when its starting to overheat they no. Motor then forces air through the heater control system of a vehicle runs the blower,... Fix a car heating system that only blows cold they have no idea what it is to minutes! Is on responsible for a vehicle’s defrosting and heating actions and lasts 30. Awd van is not blowing hot air are typically situated directly in the back blower works but no air! But all vents on passenger side blows cold is less than 6 inches deep and weighs 26... 'S side and middle vents but all vents on passenger side blows cold but!