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Old 03-10-15, 06:58 PM   #1
Cthopkinsc
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Question A/C problem

What's up SC fans? Replaced outside air temperature sensor today. Correct outside temp now displayed. However a/c still only blows cold on max. When I adjust it to a warmer temp it blows hot. Check refrigerant level and all good. What's on the inside behind the 1'' square?
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Old 03-10-15, 11:11 PM   #2
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The cabin temp. sensor is behind that 1" square.

I would start by looking at the heater control valve and seeing if the actuator's rod is improperly moving through its full range of motion when you adjust the temperature just a bit. Another possibility would be the blend door, but I have no idea how to troubleshoot that.
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Old 03-12-15, 11:21 AM   #3
Cthopkinsc
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Red face Questions?

Could the cabin air temperature sensor be causing the a/c to change from ice cold to hot when I try to adjust the climate control ****? I'll be checking the heater when I get home.
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Old 03-12-15, 04:57 PM   #4
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There are diagnostic tests outlined in the factory service manual for the cabin temp. sensor, but be prepared for a major PITA getting it unplugged. I partially busted up the sensor's housing and nearly broke the dash panel, and the sensor ended up being fine...
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Old 03-13-15, 04:09 AM   #5
Cthopkinsc
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Default Location location

Where would the heater control valve be on the 95 Lex SC 4.0?
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Old 03-13-15, 07:02 AM   #6
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Quote:
Originally Posted by Cthopkinsc View Post
Where would the heater control valve be on the 95 Lex SC 4.0?
You'll find it on ... Google. Try harder, bud.
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Old 05-21-15, 04:59 AM   #7
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Default Max cool/Max heat problem

Did you ever resolve what was wrong with your system?

I have the same problem and have searched the archives for heater control valve, various sensors, air mix servomotor assembly and the climate control unit itself. I am leaning toward it being a problem with the air mix damper position/servomotor assembly. Maybe someone can share their experience with this problem.
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Old 04-22-16, 07:35 PM   #8
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i have the same prob. any advice?
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