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Heater blows cold air at idle but works great above 25 MPH

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posted on Oct, 21 2017 @ 05:14 PM
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originally posted by: seattlerat
Thanks to all of you for the replies so far- I have some things to try and will get back with what (hopefully) worked!

To answer some of the questions:

* No water on the floor near heater core location
* Thermostat was NOT replaced and engine temperature is normal (gauge shows exactly the same as it always has just below halfway)
* I did try to bring rpm up while in park and it didn't seem to make a difference, I'll try this again today

I hope it doesn't have anything to do with water-pump. I've changed a thermostat before so I could try that if adding coolant and parking on hill technique doesn't solve the problem.

You guys are great!

Thermostat stuck in the open position




posted on Oct, 21 2017 @ 07:44 PM
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when my cars always did that most of the time i was low on antifreeze might just be that simple
edit on 03 08 2017 by TimHeller because: correction



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