Question about 1999 Dodge Durango

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Car over heats when i use the air conditioner. I have put new fluids new fan clutch water pump thermostat and temp sending unit on. Also theinformation center comes on and off.

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Your problem actually sounds like a radiator problem. It could be the Thermostat (but new), however if it only over heating with the A/C on, on a hot day, Then I believe your radiator needs flushed.

Over time the radiator will develop corrosion in the tubes and reduce the cooling capacity. The coolant has corrosion inhibitor in it when new , but, they degrade over time and lose the ability to prevent build up:
1. Check that the radiator and reservoir is full of coolant.
2. If the coolant is not a clear pink or yellow, it needs replaced.
3. if you do it your self , buy a flush kit from the auto parts store and install it in one of the heater hoses. follow the directions on the kit. to flush the engine, you will need to be near a water hose.
4. use the recommended mix of anti-freeze to water...usually 50/50.
5. buy and use some "Water Wetter" it will increase your cooling capacity and mitigate this type of overheating (You are describing a very common problem with engine overheating this time of year).
6. Check that the fan is working and your belt is in good shape.
7. Look at the radiator through the grill, is it plugged with dirt and other road debris? use the high pressure washers at a car wash to clean out the fins, wash out the stuff that gets in there.

Hope helps.

Posted on Sep 07, 2010


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Check your fan clutch- is it engaging when idling and at op temp if not then chances are the clutch is bad.
Replace your thermostat it's usually a cheap and easy fix
it just sounds like you have enough air going through into the engine compartment to cool it down but when you have no air going through at idle it heats up which leads me to believe it's something to do with the clutch fan or thermostat.
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