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#1
10-10-2005, 11:01 PM
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'88 trooper thermostat question
I have an '88 Isuzu Trooper with a 2.6Liter 4 cylinder engine and when the engine is cold and I drive it for about 4 or 5 minutes, the temperature gauge nearly points to the "H" position before it starts going down to normal pointing straight up at the very center between "C" and "H".
Is this a sign of a weak thermostat or is this just normal for a 4 cyinder engine? 
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#2
10-11-2005, 04:40 PM
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Has the water pump been replaced?
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#3
10-11-2005, 08:22 PM
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Reply to Hollowcreek
No, I haven't replaced the water pump in the 6 years I had it. But how can the water pump be bad? After the thermostat kicks in, the temperature returns to normal and stays that way down the road.
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#4
10-12-2005, 05:41 PM
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By virtue of the fact that it cools down at a certain point, the thermostat is opening, eventually. Try a thermostat first, but I ended up having to replace the WP. My overheating was being caused by lack of sufficient circulation due to a shot pump and exhibited the same symptoms.
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#5
10-29-2005, 07:14 AM
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Re: '88 trooper thermostat question
Yes it is a weak water pump. Also replace the thermostat and flush the entire system when you do it.
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