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Feb 15, 2009 | 09:41 AM

rtc722

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Joined: Feb 2009

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From: New Bloomfield

I'm confused

Just replaced waterpump on my 99 F350. The thermostat is still leaking. Replaced thermo & seal. About 3 months ago replaced upper housing. Why won't it seal,should I replace the upper housing again & get new bolts?

Feb 15, 2009 | 09:46 AM

meanv10

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Joined: May 2007

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dono, but if all else fails I would try some High temp RTV sealer, that would be alot cheaper than replacing the manifold. That is strange.

Feb 15, 2009 | 09:47 AM

Furian

You Keep What You Kill

Joined: Dec 2006

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From: Huntersville, NC

Was the thermostat leaking BEFORE you replaced the water pump? Also, what engine do you have in the truck?

Feb 15, 2009 | 09:48 AM

Rongold

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Joined: Dec 2004

Posts: 819

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From: Putnam Valley, New York

Leaking

Don't know. You never filled out your profile, and we don't know what engine is in your truck. Do everyone a favor, and FILL OUT YOUR PROFILE !!!

Feb 15, 2009 | 10:15 AM

rtc722

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From: New Bloomfield

Opps. It has the 7.3 psd. Don't think thermo was leaking before new pump.

Feb 15, 2009 | 11:29 AM

redford

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Joined: Sep 2000

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From: Stephensville WI

The new upper housing you put on isn't any good. Sounds like it isn't sealing.

I would try a new one.

Feb 15, 2009 | 11:51 AM

rtc722

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New User

Joined: Feb 2009

Posts: 24

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From: New Bloomfield

Thats kinda what I figured. Thanks for your input guys. Still working on that profile,I'll get it soon.

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Feb 15, 2009 | 09:57 PM

Steve_250

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Joined: Nov 2003

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From: Near DC

Here, get the billet housing and scroll down for the 203* thermostat.
That stamped crap doesn't last more than one time on.

Feb 15, 2009 | 11:48 PM

#10

bayou barataria

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Joined: Jul 2007

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Try indian head gasket comound, that stuff will seal anything.

Feb 16, 2009 | 12:07 AM

#11

TPM

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Joined: Jan 2004

Posts: 183

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From: San Diego

Do not use high temp sealant if you have an oil cooler on the side of the engine. Trust me - I had to pull threads of it out of the oil cooler. From what i know of these engines, none of the surfaces should require a RTV to seal.