2004 300M overheating problem

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" > wrote in message
...
>
> 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?
>

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

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?

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
(http://300mclub.org/forums/index.php...dc347d2afee34),
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')

did the cooling system get properly bled of air and is it at level???

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

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?

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.

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

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


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

Larry

"Trent 300m special" > wrote in
message ...
:
: 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



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