I can’t figure out why my car still overheats even after flushing the system, new thermostat, new water pump, and bled the system. It drives fine through town unless the AC is on for too long. I don’t have any leaks and there is no coolant mixed in with the oil which means I don’t have a cracked hea…

[image] Josh49: thinking about removing and leaving thermostat out Stop thinking about that. It won’t help and possibly hurt the problem. Silly question, maybe, but have you checked to make sure the cooling fans are running?

Yes, lol. I do have good knowledge about cars. I’ve always done my own work, when I have the time or special tools. It’s also had a new radiator put in from the previous owner.

That was one of the first things I got. I always eliminate the cheapest parts first.

Check to see if the radiator fans work for high speed. I have found some of these that seem to operate properly for the first 20 minutes because the fans are running at low speed but after the engine coolant temperature reaches 230 F the PCM switches the fans from low to high, if the fan motors won’…

Yep they work on high, I can hear the difference

The symptoms point to a clogged radiator if the fans are working ok. When it is heating up put an infra red temp gun on the radiator, if there are cooler spots it is plugged. This car is old enough that a neglected cooling system can clog a new radiator.

It was clogged up but I thought that I had got everything out. But I’ll try infrared thing when I get a chance. Should the temp be high or low?

You are looking for cooler spot than the rest of the radiator indicating reduced flow there.

[image] Josh49: there is no coolant mixed in with the oil which means I don’t have a cracked head or gasket. Possibly. You could have a head-gasket breach between the cylinder and the coolant. That will cause overheating. A test for exhaust gasses in the coolant is the best way to determ…

2001 Chrysler 300M overheats after system flush

Maintenance/Repairs

keith September 14, 2018, 11:54pm 4

Try a new radiator cap. The symptoms of a bad radiator cap include overheating under heavier load such as high speed, going uphill and/or running AC.

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2001 Chrysler 300M overheats after system flush

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