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Q: My 1998 Isuzu Rodeo LS gets hot, then cools, then gets hot and stays hot

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My 1998 Isuzu rodeo gets hot after about ten miles or so. It will cool down for a few more miles then get hot again. This will happen a few times then it will get hot and stay hot. My coolant is full. I have new hoses and radiator cap. My water pump does not appear to be leaking. There does not appear to be any leaks coming from the engine. I can let it idle for a long period and it doesn't get hot. But when I get on the road it gets hot! Need to find a next step!

My car has 22700 miles.
My car has an automatic transmission.

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