Cooling help - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 3 (permalink) Old 11-20-2011, 01:49 AM Thread Starter
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Cooling help

My water pump was going bad, so I replaced it today. While I was at it, I figured I would change out the thermostat as well. I found the 203 degree thermostat from Dieselsite and used this. After filling the system with distilled water, I ran it up to temp. It seemed to take a long time, so I took it out on the road for a quick spin. During the initial warm up, I didn't find any leaks. While on the road, the truck definitely warm up (I have an un-modded truck, so I have the stock water temp guage), got a lot warmer than it has ever been since I have owned the truck. I back off a bit, and the temp needle dropped quickly. When I got back to my house a couple of minutes later, I popped the hood. It appeared that water had been spraying out on the fire stop blanket on the hood, as this was wet, but I could find any water dripping anywhere and the engine appeared dry.

After it cooled a bit, I opened up the over flow tank, and all of the sudden I hear water dripping out from the bottom of the truck. I looked, and water was coming out of the thermostat housing. I changed the gasket while changing the thermostat, but it is definitely leaking there. Everything is torqued well. Any suggestions?


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post #2 of 3 (permalink) Old 11-20-2011, 02:56 AM
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Re: Cooling help

The factory thermostat housing is a PITA. Usually you need to very slightly "bend" (not really the right term) the bolt hole ears upward so that you get some clamping pressure on the gasket. Cheers!

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post #3 of 3 (permalink) Old 11-21-2011, 03:42 PM
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Re: Cooling help

The housing is made of soft steel and deforms/corrodes easily.

Best to replace it along with the bolts. They are M6-1.0x20mm. class 10.9 hex flanged cap screws (a/zone has them).

97 F250HD (Cal. model) Auto, Ext. Cab XLT, 4x4, long bed
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