I have a 1992 toyota pickup with a 22r. I have air in the cooling system and I need to get it out. I was told that there's a sensor or something that I can unscrew and then start the truck, let it run until coolant starts to come through, then screw it back in. But I haven't been able to locate it or even if that's the right way. It's causing my truck to idle up and down.
Hopefully, I am wrong. However, I'll keep it short and simple. Get a test kit to check for exhaust gases in the coolant system. Unless you just recently did some work on your truck where you could have gotten a lot of air in the system, I don't think that is the problem. I'm betting you have a headgasket going bad. Autozone or a similar auto parts store should be able to provide you with a kit. Don't wait too long. The air in the coolant and the funky idle (likely the result of crossover from one cylinder to another) seem to be the relatively early signs of headgasket failure which the 22r series motors are notorious for. If it goes too long, you could wind up seriously overheating the motor causing damage to the head and oil sealing rings.
Chris
Thanks for your response. Actually I just had the motor rebuilt and have only put 200 miles on it. So I don't think I have a blown head gasket. The guy who rebuilt said he can get the air out but, I was wanting to do it myself I just didn't know how.
Ok. It could just be airlocked then. You can even just pull the a coolant hose at the highest point, usually somewhere around the heater in the engine compartment and pour coolant down it or use a vacuum set up. Hopefully, that is all it is, but I think generally in an airlocked motor the motor will overheat usually pretty quickly after assembly and not affect the idle. Ask him if he used new headbolts or if he reused the old ones. I believe the old bolts are torque to yeild bolts and if reused them the head probably didn't get torqued properly and there already is a problem with the headgasket. It is also possible the headgasket was not correctly installed or received some damage during the install. Did you have the head retorqued after a break in period? Some headgaskets take as many as 3 times until the head is properly torqued. One during first assembly, one after having been warmed up and one later on after the truck has a a couple hundred miles on it. I hope you are right about there just being air in the system, but this sounds really familiar. Fingers crossed.
Let it idle up and down, as long as its setting level, it will purge itself of the air. Unless you have a headgasket leak which is injecting air into the cooling system.
Why do you say it is causing the truck to idle up and down? You may have two separate issues. Often this engine will idle up and down if there is a vacuum leak (brake booster, open throttle plate, hose, defective vacuum component). Mine had a leak that took me months to find. If the truck has been recently rebuilt, that increases the likelihood of a leak -- something was disturbed.
and I need to get it out. I was told that there's a sensor or something that I can unscrew and then start the truck, let it run until coolant starts to come through, then screw it back in. But I haven't been able to locate it or even if that's the right way. It's causing my truck to idle up and down.
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