my 1993 850GLT suddently has lost the hot air capability. Fan still run A/C (cooling) is ok when turn on but no hot air in winter time. Is somthing wrong with the Environmental Control Unit ? Also, I can only control driver side A/C not the passenger side. Anyone can help ?Thanks.

 

How's the thermostat working? Is that needle functioning correctly?

 

It is called Global Cooling[8D].

Yes most likely the thermostat has retired if you lost heat. As to the pax-side control not working, one of the damper motors may have retired or is out of calibration.

Pull codes & see what you find, then reset the system to see if the same code comes back.


JPN

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You have a 1993 so you can read codes under the hood. Read B1 and see what comes back. Chancesare it's your thermostat though.