Skip the auto shop - Our mechanics make house calls

Q: Constantly overheating 2003 Dodge Durango

asked by on

Overheats in still traffic or idle, cannot find a coolant leak thermostat is good bc both hoses feel same temp and car reaches operating temp good. Replaced the aux water pump thats electric and helps send coolant to rear heater core bc it was leaking. Have to keep adding coolant, oil doesnt look mixed with coolant or vice versa. Fan clutch feels viscous still.

My car has 173 miles.
My car has an automatic transmission.

It seems like you have an air flow issue or air in the system. The fan clutch should spin with a small amount of resistance when the engine is cold. With the engine up to temperature, the fan clutch should be much tighter and the fan should be hard to spin by hand. If you do not notice a significant change of resistance, I would suspect the fan clutch to be bad.

Also, check to make sure that you have bled all of the air out of the system. Sometimes air will cause the water pump to work inefficiently at idle, but once you are moving, the increased flow overcomes the inefficiency of the pump. A pressurized leak check can be used to determine if you have a leak, and helps locate the leak by forcing it to leak under pressure. If you need help testing your system, a certified technician, like one from YourMechanic, will be able to test your cooling system to determine cause of the overheating issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Vehicle overheats; leaks fluid

It sounds like you may have a bad radiator hose or some corrosion built up on the pipe that the hose connects to. I would recommend having your radiator flushed, thermostat replaced, and radiator hose and clamps replaced to prevent...

Q: Changed heads and now it won't start. Dodge dealer said no compression

Hi there. For the valve seats to drop out of the cylinder head(s), the engine overheat must of been severe. Assuming you followed proper procedure replacing the cylinder heads. This would lead me to believe it to be the compression...

Q: The truck starts then stalls or shuts off

This could be a wide variety of potential issues ranging from a vacuum leak, bad idle air control valve, low fuel pressure, bad coil packs, or many other possibilities. When this happens you should have a Check Engine Light on...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.