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#2012041 - 09/09/10 11:49 AM Flush & Refill - 2002 GMC Envoy
Chriznat20@msn.com Offline


Registered: 11/23/04
Posts: 831
Loc: Michigan
My 2002 Envoy (4.2L I-6) has 140,000 miles on it. Ive owned it since 60,000 miles, circa 2004.

The water pump is *just about* to give up the ghost, with a whole bunch of play in the water pump shaft, but not leaking yet. I plan on replacing it in the next week or so.

I replaced the t-stat around 100k, and partially drained the cooling system and refilled with 50/50 Dex-cool Prestone.

I would really like to drain out ALL the coolant this time, fill it up with a flushing product, drain that, THEN replace the water pump and refill with NEW dex-cool.

What is a good recommended "flush" product, and what coolant is recommended here on the forum?


Edited by Chriznat20@msn.com (09/09/10 11:55 AM)
_________________________
07 Prius
81k miles M1 AFE
10 Escape/3.0l
50k miles Synpower 5w30
97 FW Vista 278
Twin 4.3Gi 185hrs&
4kw genset 17hrs- T5

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#2012990 - 09/10/10 08:06 AM Re: Flush & Refill - 2002 GMC Envoy [Re: Chriznat20@msn.com]
oldmaninsc Offline


Registered: 09/25/06
Posts: 1199
Loc: California
Originally Posted By: Chriznat20@msn.com
My 2002 Envoy (4.2L I-6) has 140,000 miles on it. Ive owned it since 60,000 miles, circa 2004.

The water pump is *just about* to give up the ghost, with a whole bunch of play in the water pump shaft, but not leaking yet. I plan on replacing it in the next week or so.

I replaced the t-stat around 100k, and partially drained the cooling system and refilled with 50/50 Dex-cool Prestone.

I would really like to drain out ALL the coolant this time, fill it up with a flushing product, drain that, THEN replace the water pump and refill with NEW dex-cool.

What is a good recommended "flush" product, and what coolant is recommended here on the forum?


I rarely ever use a "flush" product. I really don't think it's necessary. Flushing with water usually works well.
I replaced the thermostat in my 05 Trailblazer EXT around the 4.5 year mark with about 50,000 miles on it. The inside of the engine was very clean. I refilled with Prestone Dex Cool.
_________________________
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2005 Toyota Camry LE
1995 Ford Aerostar EXT
1998 Ford F-150

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