You are here:

Mercedes/Overheating

Advertisement

Expert: whunter - 4/26/2007


Question
I have a 1991 300TE and as soon as the weather turned hot this year my car continues overheats and boils out all the antifreeze when using the a/c.  The 2 electric fans do come on but only with the temperature having risen real high.  I would prefer to have the electric fans kick on when the a/c turns on.  I have removed the thermostat and installed a new radiator cap.  One interesting thing is that as the temp rises, I try to cool it down with a garden hose directly on the front of the radiator through the electric fan openings but I noticed the temperature gauge does not come down.  Could this be a water pump problem.  I have 240,000 miles on this car.  Could it be a radiator problem?

Answer
Answer:

Stop driving it or the engine will be wrecked.

This sounds like a failed water pump, common on your model.

The thermostat MUST be installed for correct coolant flow.

PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1991 Mercedes Benz 300TE Wagon
Part: Water Pump
 Note:  
Models prior to indicated engine cut-off require (1) 104 203 08 02 drain line. Water pump does not include 110 200 05 15 thermostat or 103 203 07 74 thermostat housing cover. Earlier versions of of 103.983 engines require (1) 103 200 14 52 return line and (1) 124 501 33 82 lower radiator hose.     
 Engine: 12-268716-
G3000-28256 Water Pump    IN STOCK
http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?header=header.jsp&foot...






You may also have issues with these two switches.

PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1991 Mercedes Benz 300TE Wagon
Part: A/C Temp. Switch
 Note:  @ receiver drier
Located on receiver drier for auxiliary cooling fan. Identified by 2 spade terminals on short pigtail with red base.     
R1055-29376 A/C Temp. Switch   IN STOCK   
http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?header=header.jsp&foot...


PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1991 Mercedes Benz 300TE Wagon
Part: A/C Pressure Switch
 Note:  
2 bar low pressure and 30 bar high pressure binary switch. This switch is designed to be compatible with R-12 and R134a refrigerants. Located on receiver-drier with 2 spade terminals. Used for compressor cut-out.     
R1054-178181 A/C Pressure Switch   IN STOCK  
http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?header=header.jsp&foot...

Mercedes

All Answers

Answers by Expert:

Ask Experts

Volunteer

whunter

Expertise

Mercedes Benz diesel 1960 - 1985. Rolls-Royce or Bentley 1959 - 1978. Jaguar 1960 - 1989. MG 1959 - 1985. British 1923 - 1969. Micro and mini cars, an area of interest and study, I will try to answer questions on these. Domestic car/light truck 1903 - 1975

Experience

30 years Automotive Field Experience.
ASE Double Master Mechanic.

Organizations
ACTIVE MEMBERSHIPS:

Cadillac-LaSalle Club http://www.cadillaclasalleclub.org/
Rolls-Royce Owners Club    http://www.rroc.org/
Lake Michigan Region
Motor Region    http://www.rroc-mr.org/index.htm
Ohio Region
Modern Car Society http://www.rroc.org/members/regions/mcs/
Silver Cloud Society   http://www.cloudsociety.org/
Rolls-Royce Foundation    http://www.rollsroycefoundation.com/
Rolls-Royce Owners' Club of Australia    http://www.rroc.org.au/cgi-bin/newforum/discus.pl
Mercedes-Benz Club of America    http://mbca.cartama.net
International Stars Section    http://www.internationalstars.org/
mercedesshop.com Diesel Discussion    http://www.mercedesshop.com/shopforum/
JAGUAR CLUBS OF NORTH AMERICA http://jcna.com/forums/index.php
Jag-lovers - Jaguar Enthusiasts    http://www.jag-lovers.org/
BMW CCA    http://bmwcca.org
Motor City Chapter BMW CCA    http://www.mpowerclub.com/cca/index.pl?cat_id=6
http://www.bmw-forums.com/forum/index.php?

Publications
Rolls-Royce and Bentley, Modern Lady.

Education/Credentials
ASE CERTIFIED: Master Auto Technician.
   Brakes, Engine Repair, Auto: Engine Performance, Auto: Suspension and Steering,               
   Heating & Air Conditioning, Auto: Electrical/Electronics systems, Manual Drive Train and Axles
   Automatic Trans/Transaxle
ASE CERTIFIED: Master Med/Hvy Truck Technician.
   Brakes, Diesel Engines, Gasoline Engines, Electrical systems, Suspension & Steering, Drive
ASE CERTIFIED: Alt. Fuels: Light Vehicle Compressed Natural Gas          
ASE CERTIFIED: Body: Mechanical & Electrical components
GM, Steering service class.
GM, Vibration correction training class.
ISO 9000 Training.                                                   
Blueprint Reading and Engineering Drawing Interpretation:   
Study of Steam Power, Certificate of Achievement:
DALE CARNEGIE TRAINING COURSE:
Refrigeration applied electricity and heating Certification:
Refrigerant Transition and Recovery, residential and commercial service.
Refrigerant Transition and Recovery, (IMACA).

BASIC Skills:
Welding: ARC/Mig/tig and gas. Blue print reading/layout, steel erection and rigging, wiring AC/DC, hydraulics, pneumatics, some lathe, mill, fabrication and instrumentation experience.

©2012 About.com, a part of The New York Times Company. All rights reserved.