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1997 Ford Explorer temperature adjustment

Tiny
WOOGLES
  • MEMBER
  • 1997 FORD EXPLORER
  • V8
  • AWD
  • AUTOMATIC
  • 177,850 MILES
The ac works on max ac but on ac or any other setiing there is nothing but hot air. I change the temperature adjustment switch, same problem. When in Max AC position "plunger" on hot water hose is out when in any other position ac heat vent defrost plunger is in
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Monday, April 26th, 2010 AT 6:49 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Hi:
When you use max AC, it is recirculating the air from in the car. This sounds like a problem with the blend door. Have you checked to make sure it is working?
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Monday, April 26th, 2010 AT 10:40 PM
Tiny
WOOGLES
  • MEMBER
  • 6 POSTS
The function select switch works, air goes out def. Floor vents, both etc. The valve on hot water line, that has a vacuum hose going to it, is in one position on max ac and on full in with all other functions. Is the blend door inside the dash? Is it possibly stuck? I guess my question is, does hot water flow regulate temp or air flow or a combonation of both? Thanks for your response!
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Tuesday, April 27th, 2010 AT 6:57 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
The blend door regulates the temp. In one direction it allows AC to enter. If it goes the other way, then heat enters. It is located under the dash near the heater core. (Not a fun job).
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Tuesday, April 27th, 2010 AT 12:15 PM

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