Question about 1990 Toyota Pickup

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Radiator keeps over pressuring out of cap

1990 toyota pickup with 22re motor new with in the last year, also new waterpump,radiator,hoses,rad. cap

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  • transit360 May 11, 2010

    How the temperature gauge? Is it reading hot?

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I hate to tell you but most likely your head gasket is blown. But first have your 13 psi cap pressure tested. If the head gasket has blown out in between the cylinder and the water passage , engine compression will enter your coolant and over pressurize the cooling system. This could be caused by a pin hole in the head gasket and that is all. also make sure your head is not warped. The 22re has a cast iron block and aluminum head causing the head to expand at a different rate than the block. causing the gasket to wear and leak. Good luck.

Posted on May 04, 2009

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Are there air bubbles coming of the raditor if there is then yuor head is cracked on an exhaust valve.

Posted on Feb 10, 2009

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I have a 2005 Suzuki Aerio that keeps on overheating change the thermostat change the radiator but a hose is building pressure causing it to burst


bad hoses.!! heck they are 10 years old, none last for ever.
a hose that fails is a bad hose. but some old hoses can be
pushed of the edge, sure, but hose is bad never the less.
is the rad cap new,? (do that first) use correct cap, pressure rating
never over 14psi.
my guess is you have venting? (name all overheating facts, SIGNS)
arethere signs oif steam and oil and carbon in the rad side tank or at filler hole (cold checked only)
if yes, that can be bad head gasket or far worse.
get the rad pressure checked (hand pump) leak down test.
then check the rad for exhaust gasses. blue/green tester.

does it only overheat parked.? when?
if it stays cool moving that means the fan is dead, parked.
the natural pressure is 12-14psi regulated by the cap.

you need to do tests first. not change parts.
are you going to replace all parts only to find a warped head.?
i cant hear engine run, nor do rational analysis.
nor see it mess up, or when and how bad. not me. im blind.
asking net bunny's (blind) how to fix this is over the top.
why not get the car serviced by a pro that has all those tools.
(at least 3 tools)
compression tester.
rad leak down finds leaks and if block head cracked or head gasket blown.
green/blue rad cap tester. (exhaust leaks)
a pryo IR heat gun to measure for hot points. (checks cores easy)

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1 Answer

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