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1986 Ford Mustang 6 cyl.


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joestwin
New User

Oct 22, 2006, 7:34 PM

Post #1 of 5 (1904 views)
1986 Ford Mustang 6 cyl. Sign In

Hi,
We have an unusual problem with our daughter's Mustang. It was constantly running hot and overheating in traffic. We pulled the thermostat and replaced it several times. We have also changed the hoses and installed a new high performance radiator. As long as we leave the thermostat out the car is fine. Each time it is installed, it runs hot.
Winter is upon us and she now has no heat. With the new radiator and no thermostat, the water temp doesn't get much above 120.
Suggestions?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 23, 2006, 2:53 AM

Post #2 of 5 (1900 views)
Re: 1986 Ford Mustang 6 cyl. Sign In

It's not good to run without a thermostat but you do have a problem.

Just a thought---- could the thermostat be in upside down? That would cause crazy problems. If it can behave without one it sure should behave with one, T



joestwin
New User

Oct 23, 2006, 1:31 PM

Post #3 of 5 (1898 views)
Re: 1986 Ford Mustang 6 cyl. Sign In

No, it's always been right side up.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 23, 2006, 2:16 PM

Post #4 of 5 (1897 views)
Re: 1986 Ford Mustang 6 cyl. Sign In

Another thought (watch out as I only have one brain cell left) but this could be a bad fan clutch. It's been so cold here I don't even need a fan!!

If this car uses that and you haven't replaced it yet it wouldn't hurt, T



steve01832
Veteran
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Oct 23, 2006, 4:14 PM

Post #5 of 5 (1895 views)
Re: 1986 Ford Mustang 6 cyl. Sign In

Pick up another thermostat and gasket at the Ford Dealer. I have had problems in the past with aftermarket thermostats not opening when they should. When I replaced it with a factory stat, it worked fine.

Steve






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