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Car Heater Blowing Cold Air?

December 8, 2009

Car heater vent and controls.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.

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By jeff from Virginia Beach, VA

Answers

December 8, 20090 found this helpful
Best Answer

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

 
December 10, 20090 found this helpful
Best Answer

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

 
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.

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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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2 More Questions

Here are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community.

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.


Answers


Bronze Answer Medal for All Time! 155 Answers
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.

 

Silver Post Medal for All Time! 255 Posts
December 27, 20160 found this helpful
Best Answer

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

 
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January 2, 2017

My heater blows cold air on heat or AC.


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Gold Post Medal for All Time! 677 Posts
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.

 

Bronze Answer Medal for All Time! 111 Answers
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.

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You can watch the heat dial. When mine goes from 6 o'clock to the 9 o'clock position, the heat comes on.

 
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