I do not get hot air from the heater?

GELLE

MEMBER
1998 FORD FIESTA
4 CYL
FWD
MANUAL
64,300 MILES

I do not get hot air from the heater when I set the heater dial to the 'red' zone on the dial. The motor running temp is in the normal range and the heater fan operates properly, only cool air comes out of vents.

Saturday, April 4th, 2009 AT 2:20 AM

4 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Heater core may be clogged, try a radiator shop, and have them backflush the core. Check the temp of the two heater hoses going into the heater core, if one is cold, flush or replace the core.

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Saturday, April 4th, 2009 AT 6:32 AM

GELLE

MEMBER
2 POSTS

I have checked both heater core hoses and both were hot at running temp. Could there be a problem with the heat/cold setting dial?
Thank you for your support.

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Sunday, April 5th, 2009 AT 12:55 PM

MERLIN2021

MECHANIC
17,250 POSTS

Under the das the heater plenum, a black box with electrical and vacuum opered equipment on it, has the temperature blend door, when you turn the dial for more heat or less heat this door should move, if it's stuck, you will get whatever temp the unit was last set at. Look under the das as you turn the temp knob, anything sound like it's moving?

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Sunday, April 5th, 2009 AT 2:59 PM

GELLE