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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

What temp thermostat? 1989 4.9L I6

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Old 02-15-2015, 05:21 PM
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What temp thermostat? 1989 4.9L I6

My truck is barely blowing warm air and the needle isn't moving off cold.

When I check for thermostats, there are versions for 195*F, 180, and 160. Which is stock?
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Old 02-15-2015, 05:22 PM
MR KROGOTH MR KROGOTH is offline
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Go for 180.
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Old 02-15-2015, 06:44 PM
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Stock is 192 so you want as close to that as possible.
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Old 02-15-2015, 06:59 PM
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Originally Posted by Conanski View Post
Stock is 192 so you want as close to that as possible.
X2..........
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Old 02-15-2015, 07:00 PM
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Originally Posted by MR KROGOTH View Post
Go for 180.
I disagree. ......
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Old 02-16-2015, 01:53 AM
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Get a 190-195 degree T stat. The cooler units increase engine wear and decrease fuel economy.
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Old 02-16-2015, 07:39 AM
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You can go with any of the above suggestions. Anywhere between 180 and 195 is fine and won't hurt a thing... it's only a 15 degree difference we're talking. I like to put 180's in all my vehicles, no sense running them any hotter but at the same time it's still warm enough that everything works as it should.

Don't go down to the 165 or whatever the colder ones are, the engine does need to warm up to be efficient.

My 96 will go into closed loop long before the water temp gauge comes off the cold mark so no worries there with a 180.
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Old 02-16-2015, 09:03 AM
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Thanks all. Went with the 195*F since that's closest to stock. Previous owner says he put in a new thermostat, but there's no guarantee it's working properly.
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Old 02-16-2015, 09:03 AM
 
 
 
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