Question about 1998 Pontiac Grand Am
Just rebuilt top end in Grand Am 3.1L "M" My son ran it hot which resulted in blown radiator, water pump, and head gaskets. It now runs awesome with no codes. Also had to replace reservoir cap when I noticed insufficient cooling system pressure. Now if I can just get the cooling fan to work correctly he can go back to driving the heck out of it! First, the fan itself is good. And the coolant temp sensor seems to display accurate readings on my scan tool. The relay is also good. And when I ground pin 32 from PCM the fan comes on as normal. I removed the PCM and checked continuity to the relay...good. So I went to the junk yard and grabbed an exact PCM (and a relay anyways). Got home and after swapping the PROM chip replaced them both. I was very dumb founded when the fan STILL doesn't come on at an appropriate temperature. Anyone have any insight on this?
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Posted on Jan 02, 2017
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