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. 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 ? If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. 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. These instructions will help you diagnose and fix a car heating system that only blows cold air. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. Also, the air from my heater is not as hot as it used to be. The heater in my 2000 Astro van blows cold air. These hoses have deteriorated from heat. 2 Answers. For such a small unit, its heat output of 5,500 – 7,500 BTUs is pretty incredible. 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. Truck is an '03 Ram w/ 4.7 98 Chevrolet Astro Van overheating - Not a great mechanic but tryn to troubleshoot cheap stuff before I take anywhere. The setting of the switch on the dashboard didn’t matter at all. My husband just changed the thermostat. Check the coolant level. Turning the temperature control from hot to cold has no effect on the temperature of the air coming out of the vents. When i switch temp guage to cold, I get colder air, when i switch to hot, only lukewarm at best. 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. 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. 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 … Living in Canada we need a properly running heater in our vans! My 2000 Chevy Astro AWD van is not blowing hot air when my heater is on. Heater cores are typically situated directly in the back of dashboards. Lift the hood, and look at the large black box on the left side of the engine. ... Well, it blows air, but just cold air since that night. heater core again? I am an owner of a 1998 Chevy Astro with rear heat and rear air. 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. 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. The back blower works but no hot air comes out. The solution is to replace 3 vacuum hose that are on the passenger side front of the vehicle, to the left of the radiator. Odyssey No Heat: How the Heater Works. Service bulletin fix and car heater not … After many automotive appointments, the auto repair shops said they have no idea what it is. ... but it also traps warm air inside and keeps cold air from seeping in through the floor. 2. hoses are hot, fluid is full. When i switch temp guage to cold, I get colder air, when i switch to hot, only lukewarm at best. ... Is the heater working ok (blowing hot air) when its starting to overheat? 2) Thermostat that is stuck open. Multi Message for Heaters not working etc. In my van,the warm air doesn't start flowing until I have travelled a few miles or the motor has warmed up. The ventilation fans blow air over the matrix and into the car. 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. This van heater is less than 6 inches deep and weighs just 26 lbs. 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. 2006 Pontiac Torrent, the air blows but not heat. It started to get warm, then went cold again. 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). 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. 2002 Dodge Grand Caravan, only get lukewarm air when on heat. Looking for help to help my mechanic. 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. Several times since I've owned the 2014 Ford Edge our heater started blowing cold air. 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 If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. The heat in our 2015 Transit XLT blows cold even though the engine is up to operating temperature. 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. Nothing seams to work or come on when you switch the … I have hot air blowing on the driver's side and middle vents but all vents on passenger side blows cold. Mechanic tried flushing the system with solvent, no luck; also feed a camera inside and doors appeared to be opening and closing properly. I checked all fuses, etc. Hello, thanks for writing in. 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. It starts about one hour after driving and lasts for 30 to 50 minutes. 2 people found this helpful. 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 water runs through the heater core and returns to the Astro's intake manifold on the engine side of the thermostat housing. 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. 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 have a 2000 Chevy Astro Van that the AC just suddenly started blowing through the defrost vents only. My car has an automatic transmission. 6. Turn off the vehicle and let the engine cool completely. 3,184 Posts . The blower motor then forces air through the heater core, transferring heat from the coolant into the cabin. 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. It would work occasionally. I have a 1995 Chevy Astro conversion van and the rear AC is blowing hot air. A heater core is responsible for a vehicle’s defrosting and heating actions. 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. The fan worked fine and the air was cold, I just couldn’t direct it out the front air vents. Mark helpful. Discussion Starter • #1 • Nov 10, 2016. I believe the 'AC' comes right off of the the front condenser or is 'Y'ed' off of it. My mom has a 1998 chevy astro van. In the winter months,I always leave the "rear heat" switch on "lo" and the rear heater will produce heat more quickly. The van has frount and rear heat and air conditioning. 3) Plugged or leaking heater core. This problem is caused by a … If the heater isn't blowing any air, skip to the next section. I will try to be as detailed as possible. asked by Kwabena A. on December 09, ... Heater blows warm air out drivers vents, cold air out @ psngr vents 2005 Scion TC. ... Now it has stopped blowing at all regardless of the setting. When I make a stop like in traffic then it starts to blow cold air My car has 197000 miles. Asked by Wiki User Also the frount blower does not come on at all, no air comes out of any frount vent. The coolant is housed in … The heat/AC controls work. The only seperate control for the rear is a fan speed switch up front. Any ideas? At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater … 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. Anyone know what this could be? My problem was only cold air out of the rear heat and only the defrost vents worked in the front only. 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. 1 people found this helpful. ... Heater is blowing cold air when sitting at idle. The heater control system of a vehicle runs the blower motor, blend doors, and temperature operation. 2000 astro van. Appointments, the auto repair shops said they have no idea what it is a 2000 Astro... €¢ # 1 • Nov 10, 2016 is the heater working ok ( blowing hot air ) when starting. Output of 5,500 – 7,500 BTUs is pretty incredible for such a small unit, its output... Output of 5,500 – 7,500 BTUs is pretty incredible driving and lasts for 30 to 50 minutes temperature.! 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