Lift the hood, and look at the large black box on the left side of the engine. My 2000 Chevy Astro AWD van is not blowing hot air when my heater is on. asked by Kwabena A. on December 09, ... Heater blows warm air out drivers vents, cold air out @ psngr vents 2005 Scion TC. 6. ... Now it has stopped blowing at all regardless of the setting. 3) Plugged or leaking heater core. Turning the temperature control from hot to cold has no effect on the temperature of the air coming out of the vents. After many automotive appointments, the auto repair shops said they have no idea what it is. I have a 1995 Chevy Astro conversion van and the rear AC is blowing hot air. Nothing seams to work or come on when you switch the â¦ A heater core is responsible for a vehicleâs defrosting and heating actions. My car has an automatic transmission. At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater â¦ The back blower works but no hot air comes out. 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. The setting of the switch on the dashboard didnât matter at all. 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 ? Hello, thanks for writing in. Discussion Starter â¢ #1 â¢ Nov 10, 2016. It starts about one hour after driving and lasts for 30 to 50 minutes. I have hot air blowing on the driver's side and middle vents but all vents on passenger side blows cold. These hoses have deteriorated from heat. 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. 2006 Pontiac Torrent, the air blows but not heat. 3,184 Posts . 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. Service bulletin fix and car heater not â¦ 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. Heater cores are typically situated directly in the back of dashboards. In my van,the warm air doesn't start flowing until I have travelled a few miles or the motor has warmed up. 2000 astro van. Check the coolant level. 2 people found this helpful. These instructions will help you diagnose and fix a car heating system that only blows cold air. This van heater is less than 6 inches deep and weighs just 26 lbs. 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. When I make a stop like in traffic then it starts to blow cold air My car has 197000 miles. ... but it also traps warm air inside and keeps cold air from seeping in through the floor. 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. 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. The fan worked fine and the air was cold, I just couldnât direct it out the front air vents. The blower motor then forces air through the heater core, transferring heat from the coolant into the cabin. I checked all fuses, etc. 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. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. 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. Living in Canada we need a properly running heater in our vans! Several times since I've owned the 2014 Ford Edge our heater started blowing cold air. My husband just changed the thermostat. 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. 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