Question about 1999 Chevrolet Silverado 1500

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Engine temp and heater temp not right.

I have a 2000 silverado 1500, 5.7, auto trans, that I am being told has a 1999 engine per VIN info. I started noticing the temperature gauge was running lower temp than normal. This truck has always being very consistant on temp. After about 2 weeks I noticed antifreeze odor and ended up having the radiator replaced because it was leaking. I had to return the truck for repairs because it would not get hot enough for heat on a cold morning, (mid 30's). They replaced the t-stat and I still had problems although it was a little better. I returned and they told me that the factory t-stat would not fit the existing water pump and they replaced it with an older style like what came out of it. Apparently the water pump is not factory and the hole on the casting for the t-stat is smaller than the new factory t-stat. The cost for a new water pump is extremely high and non of this makes sense. I do not want to replace a working pump and find out it still doesn't come up to temp. Could there be another problem? The truck worked fine up until a couple of weeks before radiator replacement. I purchased the truck new and never remebered having the water pump replaced although It must have been. What is the correct course of action now?

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Take it to another shop, The water pump doen't hold the Thermostate. The thermostate is in the thermostate housing where the end of the radiator hose is connected to the egine. 
There are different thermostate rating to which temprature you'll like your engine running at. Most common would be a 190 thermostate you can get them from 160 up to 220. 
As for the water pump you would know if that failed do to over heating or leaking from the weep holes in it. 
Bring the truck to another shop and have them flush and Antifreeze if it's never benn done and change the Thermostate to a 180 or 190 and should be done every Two years do to waer and tear. Note the 180 runs cooler then the 190 and so on. 
I run mine on 160 since I tow a trailer and the radiator also cools the transmisson oil too. Just for though but you should be fine at 180 or 190.
Good luck and hope this helps.

Posted on Apr 23, 2009

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