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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  • Dodge Master
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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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ok, you did a coolant service with STAT,

and it failed.

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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.
How much more does it heat up at idle as opposed to driving on the highway? check your thermostat ratings if possible i believe my firebird's thermostat is rated for 195 degrees. If the engine temp is exceeding the temp your thermostat is rated for then something else is going on.
Always look for the small things first and replace them if you need to before replacing anything big like the water pump which isn't too hard but is time consuming. Hope this helps. Good luck.

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Water pumps can stall out, but do you have air trapped in system.
Had you recently had the system "open" to replace hose, thermostat, temp sensor. Some Ford and GM have a bleeder screw on a high point in cooling system to bleed out trapped air.

Check your trans fluid color. Since the trans cooler is built into radiator (automatics)

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