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Re: radiator keeps over pressuring out of cap
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.
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Friend, I build and run Toyota pickups with 22RE engines in each one. Mine used to overheat all the time, I thought it maybe possibly normal, but not feasible. I found I had to go to a 9 pound radiator cap and it stopped overheating and loosing coolant. Next one built I used the 9 lb cap and no problem. Then, on long hills it would heat up more than I thought needed so I dug deeper and found a new clutch fan took care of it. I've had no overheating problem since, though it does warm more climbing hills. But not enough to be alarmed about. Just be sure all the hoses on the radiator are real good and don't allow any oil from the leaking front seal to stay on the lower hoses. That one from the pump to the connecting pipe at bottom will crack out easily. You have to stop that oil leak with a new seal and speedy sleeve on the harmonic balancer. Though these Toyota pickups are now few and far between, since they're all being shipped overseas for their longevity, I still find one once in a while in good enough condition to keep and rebuild. I have innumerable extra parts for '84 t0 '91 Toyota pickups. And another whole '90 on the way, if I can finally get the guy to let me have it instead of sending it overseas. It's in too fine a condition for me to lose this one.
I'd start with replacing thermostat (that's the most common fault) Other possibilities; waterpump,leaky hose, radiator cap (not holding pressure), fan belt broken. I'd inspect for belt & leaks - if good replace thermostat.
FILL RAD AND BOTTLE, LEAVE CAP OF AND WATCH WHEN ENGINE IT RUNNING , IF LEVEL DROPS WHEN MOTOR REVS PUMP OK, IF NO CLEAR MOVEMENT PUMP FAULTY, IF BLOWS WATER OUT, POSSIBLE HEAD GASKET OR CRACKED BLOCK/HEAD, YOU CAN DO THIS WHEN COLD,
ALSO CHECK THERMOSTAT IS NOT UPSIDE DOWN AND ALL HOSES CONNECTED ON REBUILD ON CORRECTLY
THIS is normal on a lot of import engines. you have a pcv valve that pulls vacuum on engine to **** out gases. when you remove the cap it is like a vacuum leak. if engine runs fine otherwise it is normal.