1994 Isuzu Trooper cooling problem. Please help
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Joined: Feb 2023
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1994 Isuzu Trooper cooling problem. Please help
Novice mechanic trying to diagnose a cooling problem and hoping it's not the head gasket or crack.
Symptoms:
-Heater works intermittently and not that hot. (I understand this is probably the heater core but i don't think it should effect overall cooling of the engine).
-temp rises while idling then cools when driving.
The oil is good without water in it, exhaust is not white. I did a head gasket test with test fluid and it was negative.
Im going to replace the radiator i'm thinking it might be clogged, and i'm trying to decide if it could be the water pump, I pulled the timing belt cover off and i'm able to spin the water pump by hand, Is that normal? or should the belt be tight to where it wont spin?
Should I do a compression test before going further?
Thanks for the help.
Symptoms:
-Heater works intermittently and not that hot. (I understand this is probably the heater core but i don't think it should effect overall cooling of the engine).
-temp rises while idling then cools when driving.
The oil is good without water in it, exhaust is not white. I did a head gasket test with test fluid and it was negative.
Im going to replace the radiator i'm thinking it might be clogged, and i'm trying to decide if it could be the water pump, I pulled the timing belt cover off and i'm able to spin the water pump by hand, Is that normal? or should the belt be tight to where it wont spin?
Should I do a compression test before going further?
Thanks for the help.
Member
Joined: Aug 2018
Posts: 38
Changing the radiator is a good idea IF you don't go back with the same lame plastic and aluminum single pass radiators that originally came in it and can be bought on Ebay for 50 dollars. I bought an all aluminum 2 pass Chinese made radiator on Ebay and I'm really happy with it. Also, make sure you have a thermostat in the system. Over the years a lot of back yard mechanics take out their thermostats and throw them away thinking that the cooler the motor runs the better. That's not the case and would explain why you're not getting any heat inside the car. Internal combustion motors are heat engines and are most efficient and run better when they're at designed temp, which is about 180 degrees. Your temp gage should climb to about half way in about 5 minutes and stay there. If you haven't changed the timing belt in the past 100 thousand miles you should do it and most timing belt kits come with a new water pump.
Junior Member
Joined: Apr 2015
Posts: 2
Changing the radiator is a good idea IF you don't go back with the same lame plastic and aluminum single pass radiators that originally came in it and can be bought on Ebay for 50 dollars. I bought an all aluminum 2 pass Chinese made radiator on Ebay and I'm really happy with it. Also, make sure you have a thermostat in the system. Over the years a lot of back yard mechanics take out their thermostats and throw them away thinking that the cooler the motor runs the better. That's not the case and would explain why you're not getting any heat inside the car when the results of the vin cheks are good https://epicvin.com/vin-decoder/dodge. Internal combustion motors are heat engines and are most efficient and run better when they're at designed temp, which is about 180 degrees. Your temp gage should climb to about half way in about 5 minutes and stay there. If you haven't changed the timing belt in the past 100 thousand miles you should do it and most timing belt kits come with a new water pump.
Last edited by DavidNoren; Mar 7, 2023 at 05:22 AM.
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