Question about 2005 Chevrolet Express
Had a similar problem with my 2003 6.0. Already had changed the water pump once a few years ago. Last week started to make a high pitched whine. Been keeping an eye on the antifreeze level since it was losing it every now and then. After first water pump, would overheat when having the AC on and under load every now and again. Last week on the way to get it inspected, it overheated. Stopped and added more water and would just make it for 5 minutes before doing it again. Temp gauge just wouldn't stop rising. Yesterday replace water pump but not thermostat. Same thing was happening. Thought it was a frozen thermostat so picked one up last night. Forums suggested I had blown head gasket so before I installed thermostat ran compression test and checked for oil in atifreeze. All okay. Did notice bubbles in the radiator neck. So heated motor up to about thermostat opeing temp and shut it down, Added more anitfreeze. Repeated that process about 6 times adding another maybe 1/2 gallon. Evidently had an air lock because after the 6th time, temp gauge dropped from about 220 to under 200. Heater started blowing hot air and had to add another quart or so of antifreeze. Been driving it all morning. Only my BMW M3 has given me problems with air pockets.
Posted on Sep 30, 2012
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Posted on Jan 02, 2017
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