Question about 1997 Oldsmobile Cutlass Supreme

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I replaced my themostat on my 1997 olds cutless supreme blows cold air hear a hissing sign on right engine after it sits for awhile idleing it oveheats

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  • yadayada
    yadayada May 11, 2010

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Have you bled the system

Posted on Dec 12, 2008

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2. not enough Ant-Freeze
3. Low on water

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Dec 12, 2008 | 1997 Oldsmobile Cutlass Supreme

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Replaced thermostat but after awhile when it has been


Did you "bleed" the air from the system after replacing the thermostat housing? On some GM vehicles, there is a brass "bolt" threaded into the housing. Some models will develop an air-lock, which prevents the fluid from filling all of the coolant cavities causing "cavitation" - which can lead to an overheat condition. If you can find the brass bolt (usually located on the thermo housing, but sometimes on the waterpump hose assembly, remove it while the engine is warming up. As soon as air bubbles cease coming out and a steady coolant flow is seen, re-insert the brass bolt.

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How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed

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