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Car Heater Blowing Cold Air

Category Cars
Car heater vent and controls.
This is a guide about car heater blowing cold air. When your car does not warm up with the heater on, the thermostat may be stuck or the coolant may be low.
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Questions

Ask a QuestionHere are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community or ask a new question.

By 0 found this helpful
December 8, 2009

I need help with the heater in my 1989 Mazda b 2600. The heater is not blowing hot and cab is staying cold. If anybody can help with suggestions it would be great.

By Jeff from Virginia Beach, VA

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Answer Was this helpful? Yes
December 8, 20090 found this helpful
Best Answer

Check coolant level first, next choice is a stuck thermostat which would need to be replaced.

Reply Was this helpful? Yes
December 10, 20090 found this helpful
Best Answer

You need a new thermostat. My car was doing the same thing.

Reply Was this helpful? Yes
December 10, 20090 found this helpful
Best Answer

IF you see a sudden abrupt change in the engine temp, or if you check under the hood and BOTH the upper and lower radiator hose are not hot at operating temperature (if one is cold and one is hot) then your thermostat is not functioning.

However, sounds like the heater core...harder to get to and more expensive, unfortunately. I would make sure that I purchase the Haynes or Chilton's manual for your vehicle (around 12 dollars) and you can trouble shoot it yourself. Also, find your friendliest parts store like Napa and beg for help! Good Luck!

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By 0 found this helpful
December 8, 2016

My heater blows hot air for 3 seconds then cold air, why? The blower works good and the AC works perfectly, but not my heater.

Answer Was this helpful? Yes
December 10, 20160 found this helpful
Best Answer

Check the hose connections in the engine to the heater, from the back of the dashboard, they may be loose.

Reply Was this helpful? Yes
December 27, 20160 found this helpful
Best Answer

Check the thermostat and does it have enough antifreeze/coolant?

Reply Was this helpful? Yes

By 0 found this helpful
January 2, 2017

My heater blows cold air on heat or AC.

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Answer Was this helpful? Yes
January 2, 20170 found this helpful

We have had several questions on that. My suggestion was to blow out the system so there is no air.

Reply Was this helpful? Yes
January 8, 20170 found this helpful

That happened to me once and it was a faulty thermostat. Once the engine has heated the water enough, the thermostat should let the hot water circulate. If it is very cold outside it may take a while for the engine to heat up. You can watch the heat dial. When mine goes from 6 o'clock to the 9 o'clock position, the heat comes on.

Reply Was this helpful? Yes
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