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Old 09-14-2013, 06:37 AM
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Stuck thermostat

My EOT & ECT have always been with in a 5-7 degree difference. My SCT livewire needs repair so my iphone can only monitor ECT. This morning I was driving home from work an stopped and pulled over 2 times and idled for about 20 mins each. My ECT was about 195-199 degress then after idling for 20 mins it goes to 220-225 (83 degree weather). This happened both times. When I start driving the fan kicks in and the temps drop back to 195-199 with in about 1-2 mins going about 40-45 MPH.

The fan looks to be spinning normal at idle as before.
Is this a sign of a stuck thermostat?


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Old 09-14-2013, 07:34 AM
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There is certainly something going on there and I would start with a new thermostat. The Motorcraft thermostat fails open normally and causes the engine to run cooler than normal usually. Not sure what is happening with yours but it is a cheap thing to change out. Is your coolant level where it should be?
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Old 09-14-2013, 07:41 AM
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Yes it could be a bad thermostat but if it is a Ford stat I've personally only seen them fail open. That being said its a cheap and easy swap so I'd start there. If you know someone with something like an AE you could check out the fan clutch engagement. A missing EGR valve can cause the clutch to not reach full engagement with some flash versions but this doesn't sound like your issue.

LOL I basically just said what you said PG but I type a lot slower on this small screen.



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Old 09-14-2013, 08:08 AM
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so the fan or driving at speed will drop temps ?

I would also be considering the water pump impeller on my check list if you can't find any other issue
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Old 09-14-2013, 08:34 AM
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"so the fan or driving at speed will drop temps ?"



Yes. I took out the thermostat and going to go get a new one now


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Old 09-14-2013, 08:49 AM
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get OEM

housing and all is 1 piece
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Old 09-14-2013, 04:45 PM
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Question

Not to hijack your thread but mine never gets above 188 unless I am on Highway going 80 for awhile and I replaced thermostat yesterday and switched to ec-1 coolant and still same outcome so I cold soaked it last night and this morning ect was 46 eot was 47 and outside temp on display in truck was 52 !! So dont know if I need to replace both sending units or whats up !!.
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