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#4605094 - 12/16/17 06:16 AM Installing New Thermostat
tc1446 Offline

Registered: 12/10/10
Posts: 916
Loc: Lexington, NC
A diagnostic test on the Ranger showed that it needed a new thermostat. I've ordered an OE Motorcraft which comes with gasket. Does the gasket go on dry or does it required any sort of sealant?
'13 Accord EX-L 2.4L (80K) M1 & FU
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#4605098 - 12/16/17 06:31 AM Re: Installing New Thermostat [Re: tc1446]
demarpaint Offline

Registered: 07/03/05
Posts: 29123
Loc: NY
I always spray them with this, and never had a problem.
Link for illustration purposes:
God Bless Our Troops

#4605099 - 12/16/17 06:32 AM Re: Installing New Thermostat [Re: tc1446]
Delta Offline

Registered: 04/20/14
Posts: 1017
Loc: South Central PA
I think it's more of a preference thing, a small amount of sealant wouldn't hurt. The housing on my S10 only really requires the o-ring gasket on the thermostat itself. I applied a small amount of Permatex sealant on the housing just for piece of mind.
'17 VW Golf GTI 2.0T - 6MT - 5K
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#4605100 - 12/16/17 06:38 AM Re: Installing New Thermostat [Re: tc1446]
stevejones Online   content

Registered: 02/13/11
Posts: 251
Loc: Midwest
I've used gasket tack only to hold it in place while the bolts are fitted - this usually applies for vertical surfaces (rear diifs, waterpumps, etc.). If the mating surfaces are horizontal, I don't bother with extra stuff...

#4605114 - 12/16/17 07:13 AM Re: Installing New Thermostat [Re: tc1446]
dlundblad Offline

Registered: 09/30/13
Posts: 9414
Loc: Midwest
I would if any mating surfaces are pitted.

Edited by dlundblad (12/16/17 07:14 AM)
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97 Chevy Blazer 4.3 142k Rotella T5 10w30 Fram TG3980

#4605427 - 12/16/17 01:58 PM Re: Installing New Thermostat [Re: tc1446]
i_hate_autofraud Offline

Registered: 05/19/16
Posts: 675
Loc: Canada

Check for sure in a service manual.

However, I use just a little sealant to keep the gasket lined up during assembly.

Using a heavier, thicker sealant is handy on pitted areas to reduce leaks past the gasket.

If you use too much, it'll ooze out on the inside and float around until it plugs a
rad passage, so easy on the goop!