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!

5 Answers

10

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.

1 of 1 people found this helpful.
5

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.

My truck is doing the same thing. Please can anyone help. I think today I will bypass the heater core. Ray S , El Paso Tx.

My truck is the same, replaced everything, fan clutch, water pump, lower radiator hose, radiator, sensor. Please help

Ok so far this is what I've figured out. I've replaced the radiator, the thermostat twice and the third one a 180, replaced the radiator cap, the water pump, everything except the heater core. I've been trying to figure out the problem for months. Started out with a coolant flush this summer. First problem, I replaced the coolant with just the normal green stuff. Prestone. WRONG STUFF.......... I spoke with a mechanic and he told me Dodge should take PINK OR ORANGE. So I did a flush again ran for 4 hour trip to make sure I got it good and flushed. Ran water through it, more water through it and more. Really wanted to make sure I had all that green stuff out. I replaced with orange and have not had a problem since. Who knew.......ohh those who read the owners manual, that's who. Honestly, I hope I'm not wrong in saying this but I thought that coolant was coolant. No matter what color. Now after reading up on it I know it is definitely different.

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