2004 300M overheating problem

How many miles?

Is it losing coolant?

Did you follow the procedure for purging air out of the system when you put the thermostat in?

Remember that if the system cannot hold pressure the coolant will boil - boiling coolant is not very efficient at carrying away heat. If it is leaking coolant it isn't going to be holding pressure.

Ted

In addition to what Ted said, there were some instances reported on the

300M Club of two things (not both on any one vehicle): (1) Bad water pump impeller. (2) Some casting debris or slag left in the coolant passages blocking coolant flow.

I don't recall if any of these instances were on 04's or not, but I would advise a search on their forums

, as well as posting your situation and seeing if anyone with first-hand knowledge of these problems can provide further info. As motivation to the dealer to find and resolve the problem, I would hint at invoking the lemon law if your state has one - you're still under warranty, right?

Good luck!!

Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x')

Is it really overheating, or is it just that the dash gauge shows overheating? Have you verified the actual engine temperature with a different gauge? It could be a bad gauge sending unit.

If it really is overheating, have you thorougly bled all the air out of the system? Does the heater blow hot air if you turn the heater on full blast? It could be entrapped air, or a bad water pump.

I just had my 04 300 special in the shop for overheating. They went through all the same stuff youve been through and it wasnt fixed. They ended up pulling the head and there was sand and metal shavings clogging it up. They told me it was a common thing from the factory defect on the 3.5. After they did that and replaced the head gasket, my over heating problems were fixed.

Trent

The "tank" is full of coolant? How about the radiator? Is there air in the system?

Larry

"Trent 300m special" wrote in message news: snipped-for-privacy@no-mx.nodomain.com... : : sheryl Wrote: : > We have changed the thermostat and it is still overheating. We took it : > to the dealership and they put it on the computer and told us it showed : > no problems. Advised us that we probably got a bad thermostat or put it : > in backwards. We got another thermostat and put it in, and are still : > having the same problem. The fans are working, the tank is full of : > coolant, and we cannot find the problem. Any suggestions? : >

: >

: >

: >

: > -- : > sheryl