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Old 03-11-2013, 07:40 PM
Pasha213 Pasha213 is offline
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Default Temp Gauge Problem- All new components-Ford Dealers Clueless

Here Goes- My Gauge started acting up. It buries, then immediately recovers. I replaced the entire thermostat unit, both the sensor locate on the back of the block, and the sender on the block. I changed the water pump last week (the o-ring on the old one was so swollen I had to beat it out) The new Sender on the block seems about two inches shorter than the original, but they say it is the replacement used (tried one form napa and one from AA). I also have replaced the 4-way heater switch, and the reservoir pressure cap. Currently it will run for about two hours with no problem at all. It will then randomly start to overheat as I accelerate. The moment the gauge gets to the redline, it resets to the correct temperature. I have had a number of ford mechanics look at it, and they are clueless as to what it could be. Any thought or people with this problem?
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Old 03-11-2013, 09:47 PM
thatranger thatranger is offline
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Default Re: Temp Gauge Problem- All new components-Ford Dealers Clueless

Quote:
Originally Posted by Pasha213 View Post
Here Goes- My Gauge started acting up. It buries, then immediately recovers. I replaced the entire thermostat unit, both the sensor locate on the back of the block, and the sender on the block. I changed the water pump last week (the o-ring on the old one was so swollen I had to beat it out) The new Sender on the block seems about two inches shorter than the original, but they say it is the replacement used (tried one form napa and one from AA). I also have replaced the 4-way heater switch, and the reservoir pressure cap. Currently it will run for about two hours with no problem at all. It will then randomly start to overheat as I accelerate. The moment the gauge gets to the redline, it resets to the correct temperature. I have had a number of ford mechanics look at it, and they are clueless as to what it could be. Any thought or people with this problem?
Maybe try an easier fix then replacing everything. Put a temp wire & reader in your tuck. Like the ones to cook with, but made for cars. Then you can get the correct temp read out. I'm assuming by your post that your truck is really not over heating but the cluster is showing it over heating. On another note, it could be the cluster itself is bad?
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Old 03-13-2013, 07:58 PM
Pasha213 Pasha213 is offline
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Default Re: Temp Gauge Problem- All new components-Ford Dealers Clueless

Hey,
It doesn't seem to really be overheating. It seems like the thermostat isn't opening and the fluid is backing up into the reservoir. When it initially starts to read that it is overheating it does let fluid out of the cap. After that, it starts to do that dance I described earlier.

The electric thermostat uses a sensor to control the change in fluid flow if I am correct. Is is possible to fit the thermostat with a mechanical one, like the old wafer thermostats?
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