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GMC Yukon Denali Questions

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It will stay on max 80 for 20-30 seconds, then drop to 0 for 10-15 seconds, and keep repeating this pattern. Engine light has come on as well.
I tried. Everything. I need help.
radio indicator will not light up. The service man at FH Dailey informed me I need a new radio. Please verify that it is ture.
hi pressure switch melted on back of compressor. replaced switch compressor not engaging put scanner on truck showing a/c request but not engaging can ground one leg of relay and a/c engages .at PCM #43 green wire a/c compressor relay control has 12v with power probe can supply ground and engage compressor.getting 12v at low pressure switch and ground.What am I missing
the plug to the bulb is melting
this has happen twice and the last time I soldered the connection but still melted plug
Does anyone know if this can be repaired or replaced?
Cannot lock locks with either the remote or using the lock button on the control area. Also, started truck and shut off. Motor stopped but all dash lights and radio remained on. Running boards and mirrors do not work either.
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