I have a 1998 12.7 Detroit that is pushing coolant out and the heat also quits unless you idle it up to about 1200 or more. I put a block tester on it, no bubbles and the fluid never changed colors. It did start overflowing coolant out of the filler neck, though. Again, no bubbles just coolant coming up just like if you over filled your sink. I disconnected the main air line off of the compressor and it still did it. It sure doesn't act like a head gasket, I've had those go out before. I really have no ideas on this one. It is in a 389 glider. The water always stays within the normal operating temperature, it has never overheated and the heater will cook you out as you go down the road. Ideas?
Detroit coolant issues
Discussion in 'Trucks [ Eighteen Wheelers ]' started by KittyKicker, Nov 11, 2019.
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Water pump impeller is slipping on the gear.
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Simplest things first, make sure your cap is holding pressure. I had a 97 start that and it was just the radiator cap on the tank.
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Unfortunately the only correct way is to remove it.
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I should have asked this before (my mistake) What is your engine temperature (1) at idle (2) cruising down the interstate?
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I don't understand. Is the cycle, 165-185-165 etc., happening while cruising? What is engine temperature while idling and "no heat" issue is happening?
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