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My 1998 Tahoe AC system is confusing to me. It appears to have one compressor
and a separate front and rear condensing unit. The rear AC is ice cold but the
front AC is nearer ambient temp. The condensing units both front and rear
produce a large amount of condensation. I'm guessing the front AC may be
allowing outside air in the unit when it should be recirculating. Maybe a damper
stuck or not functioning? Does anyone know where I could find a schematic of the
system? Any other suggestions on what it might be, or if I may be way off on my

Thanks, ChuckD

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Hey Chuck.
Yes, the truck has one compressor on the engine. It has two evaporators. One for the front, one for the rear. If the rear is cold, and the front is warm, the freon charge is good. Sounds like you have a problem in the front temperature door. The door has an electic actuator motor to contol the door to output warm or cold air- evaporator or heater core. If this motor failed, then the temp of the front air would always be warm or cold, depending on what position it was at when it failed. This is a pretty common problem.

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Meccboy, What should I look for in trying to locate this electrical actuated door? Is it easy to spot?

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Thanks Meccboy, I located the actuator just above and to the right of the gas pedal. It appeared to function fine so I traced out the heater hoses and found a vacuum hose split going to a inline valve on the heater hoses. Appears to have fixed it.
Chevy Silverado temperature actuator

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