08-23-2005, 03:42 AM
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#1 (permalink)
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Join Date: Jun 2000
Location: Houston, Texas, Harris
Posts: 489
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thermostat housing leak
About a month ago, under preventative maintenance, I changed out the water pump, thermostat, hoses, belts, and flushed the radiator. I drove the truck about 1200 miles, including a stint in South Texas in 100°F+ weather. no problems. then last week, I was pulling a 12,500 lb. trailer to New York State and noticed that the engine temp. going up the hills in Virginia/Pennsylvania was rising to 205/210°F. I wasn't too cocerned because I had the A/C on, a lot of trailer weight, there was traffic, ambient air temp. was warm and the truck was pulling at 65 mph. And in the flat areas, it was running 175°F. I have a TST #11 plate, but my boost never went over 30 psi and my EGT was about 1100°F going uphill. However, I noticed at the next fill up that the thermostat housing had weeped some antifreeze an sprayed it onto the No. 1 exhaust manifold runner. (it's right behind the thermostat housing) I watched the situation the rest of the trip. there is a light blue dried crust on the exhaust manifold, but the overflow resevoir never dipped in level. I have new gaskets for the housing, but would imagine it would be prudent to change the housing bolts too. Is this something to be expected while pulling heavy loads?
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Gone, but not forgotten---
'97 2500 5 speed, 4:10 gears, +257k miles
New---
2010 2500 6 speed, 3.73 gears
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