A/C problem

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Mar 10, 2015 | 06:58 PM

Cthopkinsc

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From: Florida

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?

Mar 10, 2015 | 11:11 PM

t2d2

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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.

Mar 12, 2015 | 11:21 AM

Cthopkinsc

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From: Florida

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.

Mar 12, 2015 | 04:57 PM

t2d2

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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...

Mar 13, 2015 | 04:09 AM

Cthopkinsc

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From: Florida

Location location

Where would the heater control valve be on the 95 Lex SC 4.0?

Mar 13, 2015 | 07:02 AM

t2d2

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Quote:

Originally Posted by Cthopkinsc

Where would the heater control valve be on the 95 Lex SC 4.0?

You'll find it on ... Google.

Try harder, bud.

May 21, 2015 | 04:59 AM

SMWallis

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From: NC

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.