Duramax Lifetime Supporter
Join Date: Oct 2016
Location: Maurice, LA
When was the last time you checked the coolant fluid level prior to getting the warning?
Do you see coolant on the ground beneath the water pump?
If the answers aer "not sure" and"no" then you will most likely be find filling it and driving it home (keep a couple of pre mixed Dex-Cool) and check it every so often. It usually starts out as a very slow leak that never makes it to the ground.
Changing the WP is a relatively involved undertaking. Not difficult just a lot to remove to get at it, including the Harmonic Balancer on the crank shaft to get access to the lower bolt on the pump.
Since you will be in there anyway the following would be good to change while you aer in there anyway:
Upper and Lower coolant hoses
Serpentine Belt tensioner
Both Idler Pulleys
O Ring on the back of the cross tube feeding the back of the Thermostat Cover.
And of course, fresh coolant (Dex Cool only) (buy the full strength and mix 50/50 with distilled water is the least expensive)
2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
Last edited by 407driver; 10-17-2019 at 08:39 AM.