thermal valve

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thermal valve

Postby Trooper2Guru » Thu Dec 10, 2009 2:32 pm

working on the the rig today and found that the thermal valve has one of the ports broke off, now my question is what does this valve do. 1989 trooper 2 2.6l 4ez1 engine thanks
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Postby CatFuzz » Thu Dec 10, 2009 3:21 pm

It is a thermally operated vacuum switch. Couldn't really tell you exactly what it does but if you follow the vacuum line, that might give a clue. As long as you plug any vacuum sources, you can usually get away with not even having them hooked up unless it's operating something that is needed.
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Postby isuzufool » Thu Dec 10, 2009 5:24 pm

It is really a useless valve and can be eliminated from your system. It was originally designed to up the idle speed if the engine gets too hot to pull more air through the radiator I think, but that is stupid anyway. The later model 2.6L engines did not use them at all, nor did they have the air induction pump for the exhaust system for that matter!
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Postby SurferJoe » Thu Dec 10, 2009 5:31 pm

isuzufool wrote:It is really a useless valve and can be eliminated from your system. It was originally designed to up the idle speed if the engine gets too hot to pull more air through the radiator I think, but that is stupid anyway. The later model 2.6L engines did not use them at all, nor did they have the air induction pump for the exhaust system for that matter!


If it's that one with the big ports up by the thermostat housing, then you only need to use one on each side - one side only has one nipple anyway.

It is supposed to do two things - speed up the water pump and also the fan.

One nipple goes into the clean air side of the intake runner and the other into the plenum. It acts as a bypass to allow extra air into the plenum and the idle speeds up - that's all.

I use mine although I have an electric fan and temp sensor that I installed as it can tell me if for some reason my fan has failed to run. The engine will speed up and you'll know that something's happening.

Unfortunately there are multiple "thermal valves" on these engines and without a placement hint - it's kinda hard to say which one you are pointing to.
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Postby Trooper2Guru » Thu Dec 10, 2009 9:04 pm

Thanks guys it was the one in the T-stat housing but after searching the planet i did indeed find alot of information on the subject, so i replaced it with a plug. and all is well.
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