new water pump problem
Thread Starter
Instructor
Joined: Feb 2010
Posts: 172
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From: Louisiana
new water pump problem
I just put a new water pump on my 99 and have run into a weird problem. I let the car warm up to purge the air from system and it was running a little hot. At idle the car was running ~190* which isnt normal, the car usually runs 178-180.* I took it for a drive and through town it comes down to about 187 and wot it comes down to "normal." Now my thought is that the thermostat isnt fully opening and I know for a fact that this thermostat is good because it was on other water pump, so is it possible that this new water pump is an 04+ water pump that needs the separate housing and thermostat? The part number for water pump is ac delco 252-846, apparently both housings fit just the older style not properly. Thanks in advance.
Another note the lower radiator hose is cool to the touch so I know the thermostat isnt opening (or at least all the way) to circulate the coolant.
Another note the lower radiator hose is cool to the touch so I know the thermostat isnt opening (or at least all the way) to circulate the coolant.
Thread Starter
Instructor
Joined: Feb 2010
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From: Louisiana
Heres a pic of thermostat mounted on new water pump, notice the huge gap there. Im almost certain that this is a new style pump that requires a 2 piece housing and thermostat, which would explain why its not fully opening.
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I thought the new pumps had the stat and everything in them and the old style was 2 piece. Maybe I am confused as I have changed a couple of them between the 99 and the 02.
Thread Starter
Instructor
Joined: Feb 2010
Posts: 172
Likes: 0
From: Louisiana
Im not sure if its a new style pump, i bolted my 1 piece housing on and started having weird temp problems (first post). Chevy never changed part numbers or anything so theres no way to tell if its old or new style, I was told this is old style but think someone was blowing sunshine up my a$$.
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Thread Starter
Instructor
Joined: Feb 2010
Posts: 172
Likes: 0
From: Louisiana
Ordered a new housing so hope fully tomorrow I will have a resolution.
Melting Slicks
Joined: Jul 2012
Posts: 2,507
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If you order the same pump, expect the same outcome. According to EvilTwin 190 is what you want anyway.