# 2002 Trailblazer Running Hot **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, trailblazer\ **Created:** [July 7, 2009, 10:20pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042 "2009-07-07T22:20:36Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Blazerox30](https://avatars.discourse-cdn.com/v4/letter/b/49beb7/32.png) [@Blazerox30](https://community.cartalk.com/u/Blazerox30)\ **Post date:** [July 7, 2009, 10:20pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/1 "2009-07-07T22:20:36Z")
At 81000 miles I had the cooling system flushed and refilled on by Trailblazer. Ever since it is running 25-30 degrees hotter. I have changed the water [ump and the thermostat and still the problem persists. Is it possible something happend when the flushed and refilled or is it possible the gage is not reading correctly? Help!! ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [July 7, 2009, 10:22pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/2 "2009-07-07T22:22:31Z")
Running hot means the temp gauge is reading in the red zone. Is it? Tester ---
**Author:** ![Blazerox30](https://avatars.discourse-cdn.com/v4/letter/b/49beb7/32.png) [@Blazerox30](https://community.cartalk.com/u/Blazerox30)\ **Post date:** [July 7, 2009, 10:41pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/3 "2009-07-07T22:41:03Z")
No it is not in the red zone. But what would case it to run 30 degrees hotter with new clean fluid in it than it has forthe first 7 + years I have owen it? ---
**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\ **Post date:** [July 7, 2009, 10:45pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/4 "2009-07-07T22:45:09Z")
I would recheck the thermostat, perhaps a higher temp one than oem got put in. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [July 7, 2009, 10:47pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/5 "2009-07-07T22:47:42Z")
You went 7+ years before servicing the cooling system? And with DexCool in it? Buddy! When you do that, all bets are off. Tester ---
**Author:** ![Blazerox30](https://avatars.discourse-cdn.com/v4/letter/b/49beb7/32.png) [@Blazerox30](https://community.cartalk.com/u/Blazerox30)\ **Post date:** [July 7, 2009, 10:49pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/6 "2009-07-07T22:49:48Z")
I only had 80k on it shouldn’t the fluid last longer than that? ---
**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\ **Post date:** [July 7, 2009, 10:52pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/7 "2009-07-07T22:52:36Z")
Let’s not cast dispersions on dexcool, as far as I know the big problems are with air in the system turning it to sludge, I made it fine to 96k on my 03 in o7. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [July 7, 2009, 11:10pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/8 "2009-07-07T23:10:56Z")
Air in a cooling system with DexCool turns the coolant acidic, which eats away at head gaskets, heads, hoses, radiators, heater cores, etc… creating the sludge. I’m not casting a negative eye on DexCool. That was done years ago when GM was sued by all the GM vehicle owners who’s engines turned to junk because of the claims made by GM about this coolant. Remember! They said it COULD go 5 years/150,000 miles before needing service. They never said it WOULD go 5 years/150,000 miles. Tester ---
**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\ **Post date:** [July 7, 2009, 11:17pm UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/9 "2009-07-07T23:17:21Z")
I believe you are over the time limit in the manual so it has exceeded it’s life expectancy. You do not have to have it replaced with dexcool. ---
**Author:** ![Blazerox30](https://avatars.discourse-cdn.com/v4/letter/b/49beb7/32.png) [@Blazerox30](https://community.cartalk.com/u/Blazerox30)\ **Post date:** [July 8, 2009, 1:51am UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/10 "2009-07-08T01:51:49Z")
What can I use other than Dexcool? Is there a replacement product and will that not damage the aluminum waterpump? ---
**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\ **Post date:** [July 8, 2009, 3:02am UTC](https://community.cartalk.com/t/2002-trailblazer-running-hot/33042/11 "2009-07-08T03:02:03Z")
Peak Global, or universal was what I had.