heater fan issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cheyenne-man · 12-06-2019, 07:50 PM

folks ive got a issue with my 70 gmc jimmy . when I bought it , all of the ac system was gone, evaporator , heat and ac controls , etc. I rounded up all of the missing components and installed them, well when I turn on the heat and cut on the fan , it blows strong, but when I rev the engine all of the fan air goes away, you can barely feel it blow, when I go back to idle it get strong again . can anybody tell me whats wrong ?

12-06-2019, 07:50 PM	#1
cheyenne-man Registered User Join Date: Jul 2012 Location: henderson,nc Posts: 89	heater fan issues folks ive got a issue with my 70 gmc jimmy . when I bought it , all of the ac system was gone, evaporator , heat and ac controls , etc. I rounded up all of the missing components and installed them, well when I turn on the heat and cut on the fan , it blows strong, but when I rev the engine all of the fan air goes away, you can barely feel it blow, when I go back to idle it get strong again . can anybody tell me whats wrong ?



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