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thermostat question

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Old Apr 13, 2019 | 07:08 AM
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thermostat question

i got up on a cold morning, started my 84 6.9. ran it for a few minutes, noticed the gauge went up to 180°. i shut it off and checked the top hose and the top of the radiator. they were cold. the heater hoses were hot.is this a thermostat issue?
 
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Old Apr 13, 2019 | 06:37 PM
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Most of these thermostats don't start to open until 192 degrees .
 
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Old Apr 13, 2019 | 09:07 PM
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thermostat question

ok, the stat is rated 192°. i get that. it just seemed weird that it reached 180 as quickly as it did. and it was a very chilly 30° morning. it usually needed around 10 mins to get up there. always seemed to take a while to pop.
i basically have reservations about the 190 stat. the po had a 180 in it ,and it worked just fine.
i replaced the h2o pump and the fan clutch last year.
 

Last edited by tree ape; Apr 13, 2019 at 09:09 PM. Reason: one detsil
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Old Apr 13, 2019 | 09:28 PM
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Replace the t-stat with a Motorcraft one if it isn't. Aftermarket ones don't fit right/stick closed/break quickly.
 
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Old Apr 14, 2019 | 09:39 AM
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thermostat question

it's a motorcraft. put in 3 yrs ago. probly IS sticking...
 
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