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Heater Problems

Tiny
91MUSTANG
  • MEMBER
  • FORD MUSTANG
I have a 91 Mustang LX 4 cyl w/180,000 miles. When I step on the throttle, my heater will switch from blowing through passenger Vent to Windshield Defrost. I've backflushed my heater core, didn't do much, but has helped with heater efficiency. Any suggestions? Perhaps bad wiring? Or bad heater core or even blower?
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Sunday, February 18th, 2007 AT 3:49 PM

3 Replies

Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
Sounds like it has to do with the heat selector, check the connections. You say that when you step on the throttle it does it. Check around the gas pedal see if there is a rubbing wire that has to do with your heating selector.
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Sunday, February 18th, 2007 AT 7:58 PM
Tiny
TAURUSWHEEL
  • MECHANIC
  • 718 POSTS
I believe these systems are combo of electric and vacuum, switching to defrost mode from any other position is, I'm betting, a classic case of vacuum leakage or vacuum storage. However always a chance of other cause, after all it's a car.
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Sunday, February 18th, 2007 AT 10:44 PM
Tiny
HUBCAP2
  • MEMBER
  • 2 POSTS
My 92 was doing the same thing and it was the vacuum leak check them good mine was very very small leak I over looked it 3 times
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Sunday, February 25th, 2007 AT 7:22 PM

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