Question about 1992 Toyota Camry V6

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I have a 93 model v6 3vz-fe engine overheating after i replaced the head gaskets, now before i go any further i am a mechanic now i used the vrs set with a monotorgue gasket the heads didn't seal straight away but they have now because i've done a combustion chamber co2 test and a radiator preasure test these show that the heads have sealed and i have no leakage from them. but this car still overheats,i've replaced the thermostat i've checked the timing i've checked the fan and it's connector at the power steering pump.i even went to the point of drilling holes 1/4"x4 into the thermostat but that made it worse.i know my gaskets are on right because i spent 15 minutes working them out and making sure they were right because this car had the gaskets done 3 years ago and they put them on wrong and had to do them again. i'm at my wits end with this car it's the first time i've been stumped to whats causing the problem the only thing left is the temp sensor but it's working too,i'm starting to think it's the solinoid on the power steering pump not letting the fan start sooner although i've tested the fan and it works.....any ideas will help....the only solution i've found on the internet was to shim the heads and use a grafite head gasket.

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  • nodda62 Apr 09, 2011

    ok problem solved of overheating 3vz-fe engine,i tried everything to stop this car from overheating i replaced every component except the fans ecu,eventually the only thing to stop it from overheating was to use a genuine thermostat and drill 6 1/4" holes in it,these engines have a flow problem and the thermostat opens at 82c i don't know what that is in farenhiet but the temperature opening is to late for the cooling system to do it's job the top of the engine runs hot untill the thermostat opens which for this engine is way to late for the fan to operate properly by drilling 6 1/4" holes around the thermostat i was able to keep the temperature gauge down to just under half and under load up a 17% graded hill at 110kph the gauge went to 3/4s then dropped dramatically back to just under half because the thermostat opened, after stopping the engine there was no boiling or loss of coolant.drilling the holes in the thermostat allows coolant to activate the thermostat sooner which in turn allows the fan to start sooner to keep the system cool



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I am also a mechanic and had s ame type of problem with hq ute fitted with 350 chev eng it ran at. 220deg we had radiator checked it was 70 percent blocked it now runs 90-110 i have done quite a few heads on a lot of different makes and models over the past six years and i have the radiator cleaned or replaced now as a part of the job it saves having to worry about the engine overheating after the heads have been done for no apparent reason. i had another car with an over heating problem we could not find any thing wrong with the cooling systme or the engine after finding out the custmer had fitted the termo fans i checked them and found they ran bacwards. i rversed the polarity and it solved the problem hope this helps

Posted on Apr 06, 2011

  • nodda62 Apr 06, 2011

    thanks but no it didn't help i forgot to add that i put a new and bigger radiator in it.

  • nodda62 Apr 09, 2011

    ok problem solved,i have replaced every component except the ecu for the fan and it still ran hot to overcome this i used a genuine thermostat and drilled 6 1/4" holes in the thermostat these engines have a flow problem the thermostat opens at 82c i don't know what that is in farenhiet but this is to late for the fan to opperate properly to cool the system,by drilling the holes in the thermostat it allowed the gauge to run at just under half and under load up a 17% graded hill 3/4's at 110kph then it dropped dramatically back to just under half this allowed the thermostat to open sooner which in turn allowed the fan to start sooner keeping the cooling system cool,after stopping there was no loss of coolant or boiling i'm satisfied that this has fixed the overheating problem of this engine



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