temp gauge problems 91 f150
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Junior User
Joined: Jun 2014
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temp gauge problems 91 f150
finally got motor running ok after head job and re gasket motor. temp running in normal range until i run blower motor in cab for heat or a/c gauge goes full hot when i turn blower off it returns to where it was upper normal range. do'nt know where to start poss bad ground? got me , any help would be great thanks.
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Junior User
Joined: Jun 2014
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i understand from previous threads that if you ground the single pin sensor for gauge that's under exhaust manifold ( i replaced it during ovhl ) when the key is on it will go to full hot position this how you test gauge which leads me to belife that when i turn blower on something is grounding is this anything you guys have run into? don't have good wire diagram to run down, and don't want to start unwrapping harness if i don't have to.any thoughts would be a big help.
Cargo Master
Joined: Nov 2013
Posts: 2,168
Likes: 4
From: South Central,MO
That is an odd problem. If it were mine, the first thing I would do is to clean the battery cables and make sure the body ground on the NEG cable is in good shape. Then I would check and clean all the other body/chassis grounds. It might not fix it, but it couldn't hurt!
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Sounds like High resistance. Check the signal wire to the square plug on the fenderwheel and ohm it out. Same problem, but mine was actually caused by rust. Seriously, I tinked with the problem for 4 years on my '92, 4.9 and the sender is in the cast iron block. Its just an idea, but, if it doesn't have a clean connection, it will give erroneous reading.
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