Engine overheats at idle and pulling a Hill or any type of trailer?

When the engine is overheating, can you hear the clutch fan kick in? If not, the clutch fan needs to be replaced and if so, I would replace the radiator because of internal blockage, you may have external blockage of the radiator fins as well, please go over this guide:

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/fan-clutch-removal

and this video as well:

https://youtu.be/N_-MLVlBHk8

https://www.2carpros.com/articles/how-to-replace-a-car-radiator

Check out the images (below). Please let us know how it goes.

Hello JERRY CHRISTIANS,

Sometimes it can simply be corrosion in the radiator. As the anti-freeze degrades over time, you can get sludge build up in the radiator.

Since it doesn't float the particles must have some weight to them. Oil or transmission fluid would float. So, it much be metal or gasket material.

If you have an Infared thermometer, (see image), take measurements at both sides of the thermostat to see if it is opening. I am sure it is because you just changed it, but best to check just in case, even new parts can have issues.

If you don't have one you can get one either at your local auto parts store or hardware store.

If that checks out, use the thermometer and take readings on one side of the radiator and then the other. If there really isn't much of a difference in readings, then the radiator might have a clogged or restricted passage(s) causing coolant to not flow properly and cool the engine.

An efficient radiator will drop the temperature of the coolant approximately 20 degrees Fahrenheit from one side to the other.

Also, have you added any other auxiliary coolers in front of the radiator or a new grill? What is the condition of the condenser in front of it? If this is clogged with debris, air won't be able to pass through.

A good test is to warm up the vehicle and with the fans on, place a piece of paper on the grill. The fans should pull enough air to hold the paper in place.

Hope this helps.

Thank you,
Brendon

Thank you for the prompt reply.
I forgot to mention in my original post. I also replaced the fan clutch as the old on would spin freely when turned my hand. With medium pressure, I also cleaned the front of the radiator and condenser. The fins on both are in in good shape.
Any other suggestions?

Hello JERRY CHRISTIANS,

Yes, use an inferred thermometer and take readings on one side of the radiator and then the other.

Here is a link to one I found on Amazon:
https://www.amazon.com/Klein-Tools-IR1-Thermometer-Non-Contact/dp/B0873T6SGR/ref=asc_df_B0873T6SGR?tag=bingshoppinga-20&linkCode=df0&hvadid=80814196436472&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4584413745308907&psc=1

You can also get one at a hardware store or auto parts store.

If there really isn't much of a difference in readings, then the radiator might have a clogged or restricted passage(s) causing coolant to not flow properly and cool the engine.

An efficient radiator will drop the temperature of the coolant approximately 20 degrees Fahrenheit from one side to the other.

The black particles you are seeing sound like corrosion which will block the radiator internally.

Thank you,
Brendon