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proper way to put on thermostat

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Old 06-11-2005, 01:07 AM   #1
099gt
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Default proper way to put on thermostat

i had coolant coming from the thermostat so i went out and bought a 180 degree therm. and new rubber seal with it. and the thing still leaks is there some special way to put it on?
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Old 06-11-2005, 02:02 PM   #2
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Default RE: proper way to put on thermostat

come on i no a few of u have done thermostats has any of yours leaked after u put it on
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Old 06-11-2005, 02:07 PM   #3
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Default RE: proper way to put on thermostat

did you use silicone sealer (rtv) on both sides of the gasket and the housing?
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Old 06-11-2005, 03:10 PM   #4
099gt
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Default RE: proper way to put on thermostat

no.....the could be the problem i didnt see any old sealer on it so i thought u could just replace it
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Old 06-11-2005, 04:30 PM   #5
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Default RE: proper way to put on thermostat

Sounds like you have a cracked manifold[] THey usually crack out the t-stat housing....same thing happend to me. I thought it needed a new o-ring,, but it turned out there was a crack inside the t-stat housing.
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Old 06-11-2005, 04:32 PM   #6
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Default RE: proper way to put on thermostat

On my camaro, the same thing happened. After 2 new thermostats i used the rtv on the gasket and it was fine. If that doesnt work you prob do have a cracked t-stat housing or manifold like devinsteen said.
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Old 06-11-2005, 05:08 PM   #7
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Default RE: proper way to put on thermostat

First remove the 2 bolts... remove rubber gasket and then thermostat. Put in new thermostat, put rubber o-ring/seal over it and put hose back on and tighten bolts down.... If it doesnt work something is wrong.
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Old 06-11-2005, 06:28 PM   #8
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Default RE: proper way to put on thermostat

hes got a 99 though, so its not likely to be a crack manifold. sometimes when i change o rings i bolt em down too tight so they twist and leak. definetly unbolt it and check, and use the gasket sealer..it saves lives.
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Old 06-11-2005, 06:54 PM   #9
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Default RE: proper way to put on thermostat

99's were just as bad. THey didn't use the alum. crossover until late '01.
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Old 06-11-2005, 07:17 PM   #10
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Default RE: proper way to put on thermostat

Quote:
ORIGINAL: Acer2428

99's were just as bad. THey didn't use the alum. crossover until late '01.
Thank you Acer. Like I said, it might be cracked....hopefully it's not. But it's not just going to leak coolant for no reason.
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Old 06-11-2005, 07:47 PM   #11
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Default RE: proper way to put on thermostat

ok ill try that if i did crack the intake how much money should i be looking to spend
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Old 06-11-2005, 07:51 PM   #12
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Default RE: proper way to put on thermostat

oh and just say it is the intake is that bad to drive on
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Old 06-11-2005, 07:52 PM   #13
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Default RE: proper way to put on thermostat

Well, you'll lose coolant until you overheat, so basically yes.
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Old 06-11-2005, 09:49 PM   #14
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Default RE: proper way to put on thermostat

for me the coolant got into my plugs and caused bad missfiring. got coolant all over the belts, which was annoying, and all over my battery. never overheated cause it was winter, but you sure will seeings how its summer
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Old 06-12-2005, 02:09 AM   #15
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Default RE: proper way to put on thermostat

If you over torque the thermostat housing you will have a leak. Over torqueing the housing causes it to distort slightly and then the o-ring (which has a very small cross section) leaks. Make sure you turn down the 2 bolts equally so the housing goes straight down. Acouple turns on one bolt then the equal number on the other until you get close to the torque spec. which is 15-22 ft or 180-264 in. lbs. Use a in.lb. torque wrench if you can. Those big ft. lb. torque wrenchs are very inaccurate at small settings especially the cheap ones that aren't brand name. Most torque settings can be done with an in. lb. torque wrench for a Mustang, except some suspension and head work. If you take a good look at the thermostat housing you will see how thin the walls are and how little sealing area the o-ring provides. Just a slight distortion can cause a leak. Don't use any RTV or other sealer on the o-ring as it causes it to slide around a get out of position in the taper on the thermostat housing.
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Old 06-12-2005, 02:41 AM   #16
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Default RE: proper way to put on thermostat

tomorrow i will try installing the thermostat again and tell u guys if it worked
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Old 06-12-2005, 09:42 PM   #17
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Default RE: proper way to put on thermostat

I have a 99GT and two days ago I just replaced my intake in the parking lot of my apartment complex... Mine cracked on the houseing but you could def. tell where the crack was, due to the steady spray coming out. Anyways, if you have to change the manifold the 96-98 are different. You have to get a 99 and newer. THey are a little bit more. I couldn't find one on ebay, but I got one from Custom Mustang It was around $300.00. I didn't have time to shop around. I just needed one fast. I know they are around $700.00 just for the manifold from Ford. Also run your VIN on fords website, in 99 they put different manifolds on, (different part numbers, same composite manifold) The Recall program is Unlimited Mileage / 7 years from original Warranty date. So your 99 would still be covered, if your VIN shows that you have the faulty manifold. Mine wasn't part of it, but obvioulsy it should have been.. ohwell. Its all fine now.
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Old 06-12-2005, 10:37 PM   #18
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Default RE: proper way to put on thermostat

Get a 2002+ manifold so it has the alum. crossover.

They can be had for $200 on www.gefracing.com
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Old 06-12-2005, 10:37 PM
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01, 1996, 2000, 95, 98, 99, correct, gt, installation, mustang, proper, put, replacing, ring, thermostat

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