Question about 1995 Honda Passport

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Dodge Neon 1998 DOHC Overheats when off the accelerator

Okay so I drive my car up the hill on the one side and my car cools down and when I go back down the other side even faster, my car will overheat. I have changed the radiator, the thermostat(I checked the original with the boiling water trick and it was working, I did the check after changing it), and the water pump and timing belt was changed last year because there was a leak in the water pump's bearing. There is a chance that the belt was not tightened or installed incorrectly, I do remember having trouble with the that got it tight(tensioner?), and I also remember getting lower mileage after it was replaced. May it have come loose and not allowing the water to flow correctly with to little tension?

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  • tbare598 Jun 03, 2009

    I forgot to mention that sometimes after the car is turned off it the antifreeze will bubble up in the overflow container. The fans do come on and after I fill the coolant it does not leak until I turn off the engine and it bubbles back

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It sounds like your coolant level may be too low. When you drive up hill the coolant will tend to flow into your engine block and help to cool it down. When you drive down hill the coolant will tend to flow out of the engine block and into the radiator. This may allow the engine block to overheat. I recommend checking your coolant level. If you need to add coolant use a 50/50 mixture of water and antifreeze. If your coolant level is low you may have a leak. Look for the leak while the engine is hot.

I'd also check to make sure your electric cooling fan is working. Let the engine warm up with the car idling in park. Watch to see if the fan ever turns on. If the fan doesn't turn on the problem could be caused by the fan itself, a fan relay, or a temperature sensor.

Posted on Jun 02, 2009

  • gdcroft Jun 02, 2009

    I wanted to comment on the mileage reduction you saw last year after you had a water pump and a timing belt replaced. I wouldn't expect a new water pump to have much of an affect on mileage. However, if they didn't adjust your timing correclty after installing the new timing belt this could hurt your mileage. If the spark plugs are firing a little too early or a little too late your engine is not running at it's peak efficiency. You can check this using a timing light. I don't know the timing spec for your car but it may be listed in you owner's manual or you can get it from a shop manual.

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