Is this caused by poor grounding?
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Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
Is this caused by poor grounding?
I replaced my temp sensor today, I had bought a new one awhile ago and lost the reciept, after I figured the old one was ok. I figured I may as well use it. I installed the sensor, ran the truck for a bit to heat it up. No leaks, and gauge read like normal. 1/2 hour later I drove the truck to work, and the gauge read normal the whole time. After work I let the truck warm up and chatted with co-workers, when I got in the truck, the gauge was practically maxed out, with the needle right at the end of normal. I cranked the heater and raced to meet my wife for dinner. Truck sat for an hour, I checked coolant and it was fine. The gauge registered high the whole way home. The heater isn't blowing blistering hot air like I would expect if it were overheating, and the truck ran great. I put water pump sealer on the sensor, is it possible, it's not making a good connection to the manifold, causing the gauge to read wrong? The 180* t-stat, water pump and 4 core radiator are all less than a year old, and non were replaced due to a heat problem. This is on my 85 F-250 w/460.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Do all the guages peg? or just the water temp guage? If all peg, it could be the guage voltage regulator located on the back of the cluster.
If not then it's possible you could have a short to ground in the sensor wire as well.
If not then it's possible you could have a short to ground in the sensor wire as well.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Warm it up with the radiator cap off and put a thermometer in the top tank. A meat thermometer will read up to 200 degrees. Find out if it's really getting hot or not.
If your reading was off because of a high resistance it would be reading low, not high.
I suspect John2Thomas is right on.
If your reading was off because of a high resistance it would be reading low, not high.
I suspect John2Thomas is right on.
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