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Ford Taurus | Mercury Sable | Ford Taurus SHO | 1986-2007 Forum for discussion of the Ford Taurus, Mercury Sable and Ford Taurus SHO. Covers vehicle years: 1986-2007

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post #1 of 1 (permalink) Old 09-28-11, 03:28 PM Thread Starter
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HVAC (A/C?) Issue - '92 Taurus

1992 Taurus SHO. I have a mysterious issue with the a/c-heating system.

The heating system has been struggling to get warm, I thought it might be something clogged in the heater hose/pipe system coming from the engine, but the other day - a sunny day so no heat needed - I had pushed the vent button and just out of curiousity I turned the temp up and felt the temp climb as I did this. Turned it back down and the temp went down. Then I pressed Def, and turned the temp up and and it stayed cool!

I do know that the A/C operates a little (off and on in short bursts to keep condensation down) in all positions except Vent. So what part of the system should I check to see what is happening? It seems like the a/c comes on in Def in particular and and then does not cycle off again, keeping the output too cool. I can turn it up to 90 deg. and the Def output still stays cool, in Vent it will turn up.


New heater core
A/C works well when it has to cool the car
all hoses checked for flow
Tested EATC unit, no codes


'89 F250 7.5L, '92 Taurus SHO w/exhaust mods (wow - a Taurus with a clutch!), '93 Taurus GL 3.0 daily driver w/ 305,000 miles and counting (very reliable after rebuilt trans. install).
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