Question about 1991 GMC K1500
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Posted on Jan 02, 2017
SOURCE: 2005 yukon denali is overheating
Start it cold with rad cap off, and heater on high heat, and let it run until you see increased flow in radiator, indicating thermostat opened & engine reached operating temperature. Rev engine slightly every once in a while and hold it there for 10-20 seconds, just to help purge air better/faster. Watch rad flow again, and wait until you see increased flow 3 or 4 times. Then top up coolant in rad to an inch or 2 from top of rad, and put cap back on. Top up return bottle to appropriate level on bottle & then try it again. If it still heats up, get back to me. Does it overheat at all times? Rad fan is good i take it?
Posted on Jul 18, 2009
most likely problem is that the cooling system has air trapped in it, if you can find someone with an AIRLIFT tool to bleed the system
Posted on Dec 09, 2009
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