Engine temp sending unit. - Mustang Evolution

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Old 06-14-2012, 06:43 PM   #1
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Engine temp sending unit.

What are the chances of this going bad? I just put my engine back together from a head gasket change and I'm still getting hot. The thing is the temp gauge drops just as fast as it rises. Any suggestions?
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Old 06-14-2012, 06:57 PM   #2
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It's possible the dumby gauge went bad. Did you burp the air out of the system?
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Old 06-14-2012, 07:55 PM   #3
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Kinda. Is there a better way than just squeezing the main hose?
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Old 06-14-2012, 08:12 PM   #4
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i usually fill it up all the way and let it run. once it gets to temp and the thermostat opens the water will go down. leave the cap off during this. then refill as needed. keep doing this until the water stays at the right level. i dont know if this is the "proper way". but its the technique that works good for me.

also you can try removing your thermostat. by doing this your water will just recirculate. with the water recirculating, your gauge should stay at the same spot once warmed up. this will tell you if your gauge is messed up. after the test, reinstall the thermostat. if its old i recommend a new one.
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Old 06-14-2012, 08:14 PM   #5
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Awesome! I will be trying that tomorrow. Thank you very much. I really appreciate it.
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Old 06-14-2012, 08:15 PM   #6
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Quote:
Originally Posted by Ohdang1990
Awesome! I will be trying that tomorrow. Thank you very much. I really appreciate it.
your welcome!
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Old 06-14-2012, 09:41 PM   #7
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Re: Engine temp sending unit.

Quote:
Originally Posted by dreamstang View Post
i usually fill it up all the way and let it run. once it gets to temp and the thermostat opens the water will go down. leave the cap off during this. then refill as needed. keep doing this until the water stays at the right level. i dont know if this is the "proper way". but its the technique that works good for me.

+1, That's the best way. Use a 50/50 water/antifreeze mix for the best cooling and heat transfer.
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