Heater not blowing hot air

HOLLI WILLIAMS

MEMBER
1988 GMC TRUCK
4WD
AUTOMATIC
200 MILES

Heater blower is blowing cold air, but the control panel on the Inside of truck and all the lights are on and all the way across from cold to hot are lit up and it cuts off after a few minutes.

Wednesday, January 17th, 2018 AT 12:54 PM

3 Replies

CJ MEDEVAC

MECHANIC
11,004 POSTS

I may not be your answer, but surely someone else on my end may be, if they jump into this thread if I get stumped!

(our end may need this "initial" info regardless)

It blows cold air and then the blower stops blowing?

Do you still hear the fan running when the air stops blowing?

Or is it the fan that stops all together (thus the air quits too)?

Was this a sudden occurrence?

Anything else you might add may be helpful!

The Medic

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Wednesday, January 17th, 2018 AT 3:08 PM

JAMIECONWAY88

MEMBER
6 POSTS

There are four main cooling system problems that can cause a heater to blow cold:
- Stuck thermostat.
- Air in the cooling system.
- Plugged heater core.
- Coolant not flowing through the heater core.
It is a little more complicated than that in practice, but these are the most common issues that you will run into.
Try to check these things and maybe you can fix it. Hope this will be helpful for you someway!

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Wednesday, January 17th, 2018 AT 8:16 PM