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10-01-2013, 11:02 AM
#4
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
That is the leak-o-matic. Unreliable and unecessary (factory eliminated it in later years). Don't waste your time and money replacing it, you will only have to do it again. The bypass mod is very popular and much safer.
10-01-2013, 12:06 PM
#6
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Location: WA
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Model: Cherokee
They are pretty cheap. Just replace it. It enables the engine to reach operating temp quicker by skipping the heater core. They eliminated them in later years but are back to using them on some newer vehicles.
10-01-2013, 12:45 PM
#7
Herp Derp Jerp
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
It was eliminated in the 1997 model year.
That valve is well known for catastrophic failures. The constant heating and cooling embrittles the plastic. A few people have had them break while on the highway and wound up running out of coolant at high temps under load. It's not worth the risk to the engine. Chrysler recognized this and eliminated it.
The purpose is to let cold vent air actually be cold and limit heat into the HVAC system. However this is accomplished by the vent door anyway. It has nothing to do with warmup time. (If it did, you'd expect it on newer models with tighter emissions requirements). I can't imagine such a small system impacting warmup by more than a few seconds.
That valve is well known for catastrophic failures. The constant heating and cooling embrittles the plastic. A few people have had them break while on the highway and wound up running out of coolant at high temps under load. It's not worth the risk to the engine. Chrysler recognized this and eliminated it.
The purpose is to let cold vent air actually be cold and limit heat into the HVAC system. However this is accomplished by the vent door anyway. It has nothing to do with warmup time. (If it did, you'd expect it on newer models with tighter emissions requirements). I can't imagine such a small system impacting warmup by more than a few seconds.
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10-01-2013, 01:37 PM
#8
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10-01-2013, 01:51 PM
#10
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Model: Cherokee
It was eliminated in the 1997 model year.
That valve is well known for catastrophic failures. The constant heating and cooling embrittles the plastic. A few people have had them break while on the highway and wound up running out of coolant at high temps under load. It's not worth the risk to the engine. Chrysler recognized this and eliminated it.
The purpose is to let cold vent air actually be cold and limit heat into the HVAC system. However this is accomplished by the vent door anyway. It has nothing to do with warmup time. (If it did, you'd expect it on newer models with tighter emissions requirements). I can't imagine such a small system impacting warmup by more than a few seconds.
That valve is well known for catastrophic failures. The constant heating and cooling embrittles the plastic. A few people have had them break while on the highway and wound up running out of coolant at high temps under load. It's not worth the risk to the engine. Chrysler recognized this and eliminated it.
The purpose is to let cold vent air actually be cold and limit heat into the HVAC system. However this is accomplished by the vent door anyway. It has nothing to do with warmup time. (If it did, you'd expect it on newer models with tighter emissions requirements). I can't imagine such a small system impacting warmup by more than a few seconds.
10-01-2013, 02:47 PM
#11
Herp Derp Jerp
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
I agree that it is not necessary. But why start pulling parts that may go bad in the future? I have seen hoses and radiators blow and cause engine failure. Eliminate those too? Try and go air cooled because you may have a radiator leak in the future? And they ARE using similar systems on new cars again for improved emissions and fuel economy