Why my heater blows cold air

heater blows cold air idle chrysler 300 Questions & Answers ...

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Find solutions to your heater blows cold air idle chrysler 300 question. ... blow warmair for a few mins then back to luke warm. i replaced thermostat ... HEAT BLOWSCOLD AIR WHEN IDLING ONLY GETS HOT WHEN START DRIVING ... About 15 minutes after driving the diver side vents start blowing straight cold air but the ...

Heater only works when pressing the gas? - DoItYourself.com ...

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Nov 3, 2011 - When I press the gas, the air from the vents is nice and hot. .... So am Idriving a car with a ton of problems, or could the power steering ... Just anotherquestion, when warmed up does the engine temperature ... When the heater is on and I'm not pressing the gas pedal, luke warm air blows from the vents.

Heater blows cool air when stopped and warm air while ...

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RedditFeb 12, 2014 - Heater blows cool air when stopped and warm air while driving 2008 Kia Spectra (self. ... just fine but appears to blow cool air when I was stopped at a stoplight. ... My temp gauge would also be pegged high when at idle / low RPM. ...thermostat only blocks coolant going to the radiator, and the heater core, ...Missing: 300m ‎luke

Why is My Car AC Blowing Hot Air? - BlueDevil Products

gobdp.com/blog/car-ac-blowing-hot-air/

the only way to make it colder is to set the thermostat colder in the evaporator or clean the muck out of the evaporator fins
Test the temperature at the vent by placing the thermometer in the vent and it should be around 10 degrees c
The temperature is not taken in the car as there is too much thermal efficiency lost form the vehicle
Remember that while air condition feels to produce cold air ,what is making you feel cool is the fact that the air conditioner is removing the humidity from the air in the car
Take it to an ac accredited service centre for testing as the TX valve may be partially blocked

the heater core needs replacing

I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital temperature on the climate control is not correct. When it states that it is below 30 degrees on the ext and it is warm outside the air wont be cold. Once it starts going above 30 degrees the air gets colder. Today the blower stop working all together. Was told it maybe the climate control unit was bad. You can hear the door opening/shutting when you switch the temp from cold to hot. But there was no heat blowing out whatsoever in the winter time. Could you please give me your opinion on whether or not it is the climate control unit or something else?

Normal reading is around 195 degrees F. Probably needs heater control valve or backflushing of heater core.

A thermostat stuck in the open position can cause both of these problems

You can put a higher temp thermostat and that should help, but it should at least have 170 degree air right now if it was working right. There are two other things you might check for, the diverter door make some sound when you switch from heat to cool and back, I can't tell you for sure if it is a manual, vacumn or electric but that would definitely cause it to blow cold air. There is also a valve which cuts off circulation to the heater core when your not using it. This valve will be in line with the heater hoses going to your heater core. I have seen some that were actually part of the heater core box. I feel pretty sure one of these will be your problem. Also if your car is low on coolant it would not heat properly. Hope this can help you!

remove heater core hose-jus 1, and blow air into it from an air compressor...WHATOUT for coolant,...ck'/flush/replace coolant--most the time this will work...try to buy only dealer or NAPA stats..kev-mn.

Check temperature heath controltemperature heather controlNTREPID Temperature/Heater Control 2000

Alot of the new fords have small radiator leaks.  If the truck is low on coolant or running above 190 degrees the heater wont work.  Top off coolant and put in some radiator stop leak.  heater should start working now that the engine will run cooler