Mechanics

OVERHEATING PROBLEM

1998 Chrysler Concorde • 155 miles



Hello and thanks for reading another 2.7 v6 overheating problem.

I own a 1998 Chrysler Concorde with a 2.7 v6.
I recently had to rush to an important event I put the pedal down twice and most likely made this engine do things it hasn't done in years.

I noticed soon after a swift rise in the temprature on the gauge as it soon overheated. My first impression, it must be the thermostat, so I changed it with a clean install. I also changed the coolant bleeder assembly. I also bypassed the heater core and applied the proper coolant and bleeded the air from the motor properly.
I have also flushed the radiator and checked the oil several times for a creamy mix of water and oil, luckily no water in crank case. Yes both fans work and I noticed two speeds in the fans, also the engine rides around from dead cold for a good 4 or 5min before the gauge goes up, it rides half way for a couple more minutes then it goes straight up to the overheating level!
What I really hope it is not, is the head gasket/s or the water pump due to the difficulty of removing the pump and or heads.
Also there is no oil in the radiator.

Can someone tell me if I am missing something other's may have failed to mentioned? Also it should be noted, that I too had no heat come from the heater but a couple times during testing on the road when I nailed the throttle again and surprisingly the heater worked and man was it hot!
It never worked again after that. I should also mention that the AC was on and working the day I got on it and this problem started but will not blow cold now.

Would you also please explain the proper precedure for flushing the radiator, I may do this one more time.

Thanks for your website and help to us all!

BODA
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BODA
October 27, 2011.



Have you pressure tested the cooling system? I believe a pressure-tester may be available to rent (or purchase) at a good auto-parts store. If a cooling system pressure tests shows that the cooling system is not holding pressure, and there are no external leaks, that would indicate an internal coolant leak. If that is the case, other tests can determine the state of the head gasket, such as a compression test or a cylinder leak-down test.

Dan_K
Oct 27, 2011.
The weirdest dam thing - I went out to get breakfast and decided to bleed the coolant system once more. I drove it down the hwy past my destination and never over heated once, I am going to try it again here in a few. It is cool out but that doesn't mean anything because if it was clogged somewhere or something wasn't working like the water pump it still would have gotten hot. Right? What I want to know, HOW THE HELL DID IT FIX ITSELF? This is strange, but I did run across a similar post saying exactly the same dam thing. I am getting rid of this car while I have the chance! Thanks for your help I will check back if it overheats again and explain.

BODA

Tiny
BODA
Oct 27, 2011.
I'm guessing that there was an air pocket. Any air in the system could definitely lead to an overheating problem.

Dan_K
Oct 27, 2011.