Question about 1995 Toyota 4Runner

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95 4 runner V6 overheating

Truck over heats fast with the thermostate in with it out I can drive about 30 minuts. Had head gasket replaced, had head checked and surfaced. water pump pumps fine, no loss of coolant. It seems like the coolant system may be geting over pressurized? could this be a cracked block?

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  • curtnorheim Jul 03, 2009

    The mechanic just replaced the gaskets and had the heads surfaced, One was pretty warped. after it was all back together the overheating problem remained. There does not seem to be any loss in coolant it appears that pressure is getting into the coolant system, overheats very fast with a thermostate in it. Im about to go pick it up $1000 bucks and the truck is no better. I just bouth the truck, the mechanic said the old gaskets were very new and there was no sign of leakage on the gaskets. So the previose owner tried to fix it also. It seems if the block was craked I would have coolant in the oil. Im at a loss to what is causing this.

  • curtnorheim Jul 03, 2009

    The mechanic just replaced the gaskets and had the heads surfaced, One was pretty warped. after it was all back together the overheating problem remained. There does not seem to be any loss in coolant it appears that pressure is getting into the coolant system, overheats very fast with a thermostate in it. Im about to go pick it up $1000 bucks and the truck is no better. I just bouth the truck, the mechanic said the old gaskets were very new and there was no sign of leakage on the gaskets. So the previose owner tried to fix it also. It seems if the block was craked I would have coolant in the oil. Im at a loss to what is causing this

  • curtnorheim Jul 04, 2009

    well I just picked it up from the mechanic he said it took about 40 minutes to start getting hot. I drove it on freeway and traffic for about 30 minutes with A/C at full it only got about 3/4 on the gauge at the highest but would also go back down to the middle even while idling. The thermostat is still in. There was absolutly no coolant in the oil or oil in the coolant. This is very strange.



    If the block has a crack shouldn't there be some oil to water contaminate?



    Also rad is clean water pump is new

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Please check whether there is a block in radiator fin

Posted on Jul 04, 2009

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Hi Curt,

here is one good shot for you. hope it helps.

http://img.photobucket.com/albums/v414/Toysrme/Answers/V6headgasket1.jpg
http://img.photobucket.com/albums/v414/Toysrme/Answers/V-6headgasket2.jpg
http://img.photobucket.com/albums/v414/Toysrme/Answers/V6headgasketdoc3.jpg

There are compounding reasons why the 3vze blows up:
1) The head gaskets are ****. The US mandate to remove asbestos fromgasket material made everyone's head gaskets in the late 80's-mid 90'sweak. Including the 3vze
2) The horrible crossover pipe superheats the #6 cylinder's valves& head area, causing the gasket to fail quickly & generallyhead warping
3) The block is iron, and the head is aluminum. While many people &mechanics blame head gasket problems on that directly, that has NOTHINGto do with it. The differance in metals only has a direct impact oncethe engine has already heated. At which case... You would have blownthe head gasket regardless because they're weak. (If it were iron/iron,alu/alu it would still have the same problems due to the head gasket.See other Toyota engine's of the era that have the same problem.)

Mill the heads flat (That's not expencive), clean the block &replace the head gaskets. Here in the US, I recommend Victor'sNitroseal headgaskets (Napa/Carquest) over the OEM Toyota gaskets.

more info in these links:

http://www.toymods.net/forums/archive/index.php/t-11772.html

http://www.yotatech.com/f123/91-v6-4runner-overheating-87042/

regards,

voodoo

Posted on Jul 03, 2009

  • marlon john madrid
    marlon john madrid Jul 03, 2009

    That I really do not want to assume, but with how you described it, it is a crack on the block. you can actually see the imbalance of the blocks by using a stick steto to listen to the combustion of the blocks.

    any difference on a block means that has the crack on the block.


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