Re: Mercedes 300E

#1

The 300E is very similar to my 260E. I had a simialr problem and I had to
replace the viscous fan clutch, as this was not engaging at around 110
degrees, so the engine was not getting any forced air cooling whan at a
stand-still.

My car does not have air con (rare in the uk) so there may be an additional
probelm to do with the aux fan for the air con with your car.

Regards,
Al Bolton
================================

"Vze27xjh" <vze27xjh (AT) verizon (DOT) net> wrote

Quote:

I need assistance with the following overheating problems.

While sitting at stop lights after driving for some time the temperature
gauge steadily moves up to 110-120 degrees.
After I start driving again the gauge goes back to 80-100 degrees. I was
told that the my car runs hot and 80 - 100 degrees can be considered as
normal. However, I was told that when sitting there is not enough
circulation in the engine coolant to get hot water moving through the
heater
core.

I was told that this problem can be corrected by replacing the auxiliary
water pump.

Can anyone verify this?

Thanks in advance for your assistance.

Ryan.

#2

Ryan:

If your mechanic told you that you need to replace the aux water pump then I
strongly suggest that what needs replaced is the mechanic.

The Aux Water Pump is part of the climate control system, not the cooling
system. It insures delivery of hot water so you get hot air out the
defrosters.

I do not know what year your 300E is, therefore I do not know which engine
you have. I have a 93 300E with the M104 engine. I suspect you probably
have the M103 engine.

Here in Arizona with ambient temps hovering aroung 110F, even in stop-and-go
traffic with the air-conditioner running full blast my temp gauge almost
never exceeds 105C. Yes, 85C to about 110C is normal.

It sounds like your problem relates to the electric aux radiator fan(s).
Depending upon year you may have one or two. These fans are two-speed fans.
They come on at low speed when when the high-pressure side of the
air-conditioning system reaches a certain pressure. They switch on at high
speed when the coolant temperature reaches 110C.

When you pull into the driveway at the temp gauge is reading above 110C, pop
the hood and check the fans before shutting the engine off. Are they
turning?

Also, a lot of times a pile of dead leave can accumulate between the fan and
the ACC condensor, or between the condensor and radiator. Shine a bright
light through there and check.

BTW, competant MB mechanic should have no difficulty isolating problems like
this.

Best Regards,
Dave Barnhart
93 300E

Quote:

While sitting at stop lights after driving for some time the temperature
gauge steadily moves up to 110-120 degrees.
After I start driving again the gauge goes back to 80-100 degrees. I was
told that the my car runs hot and 80 - 100 degrees can be considered as
normal. However, I was told that when sitting there is not enough
circulation in the engine coolant to get hot water moving through the
heater core.

I was told that this problem can be corrected by replacing the auxiliary
water pump.

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Re: Mercedes 300E

Mercedes-Benz Mercedes-Benz Cars Discussions (alt.auto.mercedes)

Re: Mercedes 300E - 07-18-2003 , 03:29 AM

Re: Mercedes 300E - 07-18-2003 , 07:38 PM