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?

Thanks,

Jim
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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!

97 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, Ext Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

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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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