Climate Control
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Instructor
Joined: Dec 2009
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From: Bowmanville ont
Climate Control
I have an 88 with the climate control(digital).What can the members tell me about this unit.Mine seems to want to stay on heat mode and sometimes the digital readout just dissapears.If I have to buy a new unit thats ok,but I would like to know more about this so I don't buy parts I don't need.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 7
From: Tampa Florida
Thread Starter
Instructor
Joined: Dec 2009
Posts: 107
Likes: 0
From: Bowmanville ont
Le Mans Master
Joined: Dec 2000
Posts: 7,839
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From: San Diego, Ca
For '88, the Display is the Processor and, but it sends signals to a postcard size device called a Programmer that controls vacuum/suction to 4 solenoids and power/ground to a motor that controls a Temp Door that controls air flow between the heater core and a/c evaporator. Those signals are dependent on what you dial in with input from the Outside (mounted on the Radiator) and Inside Temp Sensors (Rear hatch Bow above the driver's seat - Coupe). The Programmer is above and to the right of the accelerator. Remove the Hush Panel under the Dash on the Driver's side to access it. Three of the vacuum solenoids - Vent, Defrost and Heater - are on the lower/left side of the HVAC plenum, just to the right of the Programmer. A 4th solenoid is used for Recirc or Inside/Outside (below the windshield) air on the Passenger side Kick Panel. With your Controls on the fritz, that needs to be fixed first.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 7
From: Tampa Florida
SunCR knows his stuff glad he chimed in on this. 
If you turn the unit "off" (and the power doesn't drop out") and it turns back on in "heat" (orange "heat" LED illuminates as well) mode could be as simple as stuck button/contact pad inside the faceplate unit. Often times when you remove 12V from the unit the fan will turn "on" by default....this is normal. You may very well have mulitple problems - for me it is best to work on one problem at a time.
If you turn the unit "off" (and the power doesn't drop out") and it turns back on in "heat" (orange "heat" LED illuminates as well) mode could be as simple as stuck button/contact pad inside the faceplate unit. Often times when you remove 12V from the unit the fan will turn "on" by default....this is normal. You may very well have mulitple problems - for me it is best to work on one problem at a time.
