Question about 1994 GMC Suburban
On a 1994 gmc suburban 5.7 engine 4 wheel drive recieving code 78 any ideas
Code 78 refers to the secondary fan relay circuit, I would start there, you might have a short in that circuit, or an open, or bad relay. Hope this helps, let me know
Posted on Dec 10, 2009
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Posted on Jan 02, 2017
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