1988 Toyota Supra car over heating

1988 TOYOTA SUPRA
127,987 MILES • V8 • 2WD • AUTOMATIC
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SPROSTON
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i have a supra 1988 and around town the car keeps cool and wont over heat but soon as i hit 3.5 revs it start to over heat i have taking out the temp gage and check if there any air locks but dont seem to be any i have checked if fan work at high revs and it does
Sep 21, 2008 at 7:04 AM
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RASMATAZ
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Try replacing the thermostat-not it do the following 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: ,Pressure test the Rad. cap,Clogged
Sep 21, 2008 at 10:04 AM