Overheating: 2006 Dodge Ram 1500 5.7 hemi. Please help!

5

Asked by Nov 01, 2016 at 10:07 AM about the 2006 Dodge Ram 1500 Laramie Mega Cab SB

Question type: Maintenance & Repair

I've replaced the thermostat, radiator, water pump, & coolant sensor.   Before I replace the thermostat- the temp would fluctuate every 15 seconds from 1/2 to 3/4 back and forth.  After I replaced the thermostat- it goes to 3/4 and fluctuates a little...but not much.  If anything, it goes up and gets close to the red zone and then back down.  It doesn't increase with speed.  The fan clutch seems to be working.  I do here gurgling sometimes.  I don't see any leaks.  Any help is appreciated!

2 Answers

If you've done all the work mentioned, sounds like you have air in the system. When the air gets over the sensor, the air is always hotter than the liquid thus the sensor reads this. Trying bleeding the air out and post results.

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I tried bleeding the air. I let it run through several cycles as I added water. It took a lot of water. I turned on the heat and noticed the heat temp goes up and down....it seemed to be hot when the temp gauge was at 1/2 and seemed to cool off as the temp gauge went to 5/8. I'm wondering if its the heater core? I don't see any leaks and the floor board isn't wet. I've also read about a head gasket leak? Thanks for any help.

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