GMC Sonoma

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We have a 2001 GMC Sonoma that has a major heat problem.
All controls are in off position and windows are open, (we bought a thermometer to read the temp in the cab just like this),,,, highest temp 119F (48.5c) with the windows up and all controls in off position the highest temp we read was 109F (42c).
Now we found out the other day that if we have the control in the defrost setting it stops the heat.

We have taken it to 2 GM dealers and both say its normal, one service tech called the GM plant and they say its normal and there is nothing they can do about it.

Does anyone know of this problem and how did you deal with it??

posted by  kplourde

definantly doesnt sound normal, maybe they made a mistake when makin the connections to the unit and dont want to admit it lol
dont know what to say check everything

posted by  Neonlover04

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