Car Overheating

CHEVROLET LUMINA
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CMOORE
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1997 Chevy Lumina, 3.1, 180,000 miles. I have recently started having problems with my car overheating. I have checked for leaks and do not see one but we have to keep putting antifreeze in it so that it won't overheat. We have to put antifeeze in it everytime we drive it probably about an a hour afterwards. Could you help me figure what this may be. I think it might be the thermastat but not sure.

Thank You
Nov 15, 2007 at 3:31 PM
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RASMATAZ
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Doing that is an indication that the coolant is being burn in the combustion chamber. Any white smoke on the back? Might want to have it tested see below

Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Thermostat,Pressure test the Rad. cap,Clogged radiator,Fan clutch,Radiator electrical fan,collaspe hoses,water pump.
Nov 15, 2007 at 3:49 PM
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DOGANDCAT
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My lumina, 121,000, 1999--just had a new thermastat and a new water pump put in..but it is still running hot...what is the problem?
Nov 27, 2007 at 10:13 AM
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RASMATAZ
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D/C

Have the tests done above and might want to bleed the cooling system
Nov 27, 2007 at 2:17 PM