1994 Trooper cooling issues
1994 Trooper cooling issues
05-05-2008, 02:02 AM
Its not vapor locked, i pressure tested and it held, there is no coolant in the oil, and it does not leak a drop of coolant.
At this point in time i am thinking a faulty senor because it drove 60 miles highway with no problems but once i hit the city and reduced my speed it start to read hotter then normal.
The only thing i did not replace was the lower intake manifold because its dry as a bone, could be leaking from the inside???
I know that to replace the coolant temp sensor i have to pull the lower intake but im not 100% thats the problem.
I am open to any suggetions at this point in the game.
Thanks for takin the time to read!
05-05-2008, 03:31 AM
You've covered a lot of the possibilities there.
Just some suggestions to consider:
* stuck thermostat (even though you have replaced it)
* blocked radiator fins (external)
* blocked radiator tubes (internal)
* thermatic fan clutch
05-05-2008, 12:14 PM
Should i pull the thermostat next time it gets warmer and see how she does? mor just buy a new one all together? i checked the radiator, no blockage i can see externaly and i have done a flush a week ago.
05-05-2008, 10:21 PM
A thermostat can only be tested by taking it out (cold) and placing it in water and heating them both while observing readings on a thermometer.
A crude test can be done without a thermometer by just heating the water/thermostat and seeing if the thermostat actually opens.
Tip: you could *temporarily* test the vehicle without the thermostat in place - does it still overheat?
Flushing the radiator does not by itself guarantee that it is not partially blocked. Only a flow test by a rad specialist will really tell.
Overheating will also occur if your cooling system does not hold pressure due to leaks or a faulty cap (though you did say that you are not loosing any coolant).
05-05-2008, 10:24 PM
hmm....i guess i should have a flow test done. the cap is brand new i bought that when i got the truck (its the cool saftey caps that i can manually releive the pressure fromt eh cooling system). i will have the radiator looked at and reply when i get the results.
05-05-2008, 10:27 PM
No worries mate - I didn't think that you guys would be awake at the moment - it's 1:30PM on Tuesday afternoon here! :lol:
05-05-2008, 10:29 PM
oh jeeze! its only 10:30 here in Minnesota!
you just seemed to have caught me at my online time :P
05-08-2008, 09:38 PM
ok after further reveiw of my motor i determined that the brand new fan clutch was defective and working the opposite of how it should be (clutching when its cold but not when hot ) i replaced the clutch and now it seems to work!
05-09-2008, 03:10 AM
Good one! :)
05-15-2008, 11:27 PM
Also, make sure you have an OEM Isuzu thermostat ONLY in that engine, aftermarket therm's do NOT keep that engine cool enough.
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