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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 07-16-2008   #1 (permalink)
fearthunknown is offline Rookie

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Default 1967 mustang thermostat installation

I have a 1967 mustang and i was told by my mechanic that my thermostat is leaking and he being the good guy he is instead of fixing it for me put it on my to do list because he knows this is my project car. Does installing a new thermostat require above average knowledge of working on cars or is it something as simple as say... my electronic ignition that i installed?
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Unread 07-16-2008   #2 (permalink)
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I take it this is a V8 car. Thermostat changes are a snap. Take off the upper hose, 2 bolts and you're in. Just make sure you have it installed pointing the right way. You can put it in upside down. And clean off all of the old gasket material.
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Unread 07-16-2008   #3 (permalink)
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Just as easy, but a bit messier. Gotta drain the coolant , remove the thermostat housing, remove the thermostat, make sure the old gasket is removed completely from the intake manifold and the thermostat housing (scrape both manifold and housing CLEAN), install a new gasket, a new 195degree thermostat and re-insatlaa the old thermostat housing, then re-fill the coolant. Oh, and be sure to look at the thermostat when you take it out to be sure you know which way it faces.Dont put it in upside down!!!
Simple, really, but allow an hour, at least, for the job.
Hope that helps,
Jay67fast
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Unread 07-17-2008   #4 (permalink)
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This would be a good time to flush & change your antifreeze while you're at it since you'll have to drain it anyway.
If it's a 289 I'd also change the 90* heater hose elbow on the tstat, otherwise it's impossible to do w/o removing it later.
Be careful not to over torque the Tstat housing bolts, it's easy to crack it or strip the threads.
Jon
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Unread 07-17-2008   #5 (permalink)
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The temperature rating of the thermostat is stamped on it. I advise that you install one that has the same rating as the old one if the engine was operating at the right temperature. Thermostats that are rated at temps. around 190* are usually used in engines that are equipped with emissions controls.
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