Question about BMW 750

3 Answers

Bmw overheating Hello I have a 1998 740 it overheated I found the auxliary fan not working checked fuses. also I am leaking water from what looks to be a valve on the firewall. any ideas about how to jump out the temp switch to check the fan.

Posted by on

  • 1 more comment 
  • irishraft5 Jun 03, 2008

    is there a way i could bypass the leaking valve

  • irishraft5 Jun 03, 2008

    how do you troubleshoot a auxliary fan not working.also I have a antifreeze leak from a valve on the firewall

  • irishraft5 Jun 03, 2008

    is ther a way to jump out the temp switch at the radiator.the valve itself is leaking if i bypass it will it cause other problems

×

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,665 Answers

If you short circuit the wires at the temp valve switch at the radiator, fan will operate continuously causing lower than normal operating temperature .
At link below you can find a service manual for your model with usefull information.
http://www.themotorbookstore.com/318.html

Posted on Jun 03, 2008

  • 2 more comments 
  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jun 03, 2008
  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jun 03, 2008

    To halt radiator leakage, the following steps should be followed:



    Step 1 - First, find out the location of the leak in the radiator. If the radiator leak is from the hose, patch the leak with the duct tape. Duct tape can hold up the leak for roughly one week, during which time you can replace the hose.





    Step 2 - If the leak is in the radiator, the next step is to remove the radiator cap and add one or two teaspoons of ground black pepper into it. Pepper lodges into the holes and also swells when water hits it, mounting to seal the hole.





    Step 3 - Close the cap of the radiator once it is filled with the water up to a proper level.



    Step 4 - Bring additional pepper with you and a jug of water because it may be necessary to add some more water or pepper into the radiator. But ensure that the radiator is fresh before removing radiator cap.



    Step 5 - The last step, which is essential, is scheduling a meeting with a mechanic. Be sure to let him or her know what temporary measures you have taken.

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jun 03, 2008

    Best Radiator Stop Leak
    One of the best leak stoppers is Silver Seal Heavy-Duty radiator, which quickly helps stop the leaks, inhibits the rust, and lubricates the complete cooling system. These silver seal radiators build permanent and quick seals, which will not damage or clog the radiators. One of the major advantages of this leak stopper is that it mixes very well with any anticoolant or freeze.

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos Jun 03, 2008

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 3,037 Answers

You should test for power at the connections of the fan, it you have voltage, then the fan is bad, if no voltage then the wires are bad which could be caused by the leaking antifreeze.

You could go and buy some more hose, which is very cheap from an auto parts store such as NAPA, AutoZone, Checker, ect. and just run the hose past the part leaking.

Let me know how this is going and any further questions that you may have.

Posted on Jun 03, 2008

  • Benjamin Patri
    Benjamin Patri Jun 03, 2008

    To test it you may bypass it, but you don't want to run it with a bypass. Are you trying to bypass it to run the car? If so, then don't do it as this can do further damage. The temp switch will need to stay where it is, so you will first need to fix the leak before testing the fan.

  • Benjamin Patri
    Benjamin Patri Jun 08, 2008

    If you are satisfied with your experience here, then feel free to provide me with some feedback by
    rating my solution. If you need any more help, I would be glad to
    assist you, just ask.





    Thanks for your time and service and I hope you have a Great Day!

×

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 230 Answers

This may be due to the auxliary fan only make it to good condition and check

Posted on Jun 03, 2008

  • balachander megavarnam
    balachander megavarnam Jun 03, 2008

    i think there is no way to bypass the leaking value ,better you check
    with good mechanic and solve because this sounds like inside problem
    ,without seeing it ,we can't do trial and error method

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

OVERHEATING


Water pump or thermostat .

Jun 11, 2016 | Cars & Trucks

2 Answers

GMC Envoy 2003 overheating


Your fan clutch could be going out...iin other words, it may be turning, appearing to be fine, but not fast enough therefor, not cooliing the engine enough.

May 23, 2012 | GMC Envoy XL Cars & Trucks

2 Answers

What make a car run hot


Thanks for choosing FixYa and welcome. If you are low on coolant fluid, it will cause it to overheat. Check your coolant fluid level. If your fans are not working or kicking on, it will cause overheating. If so, check the fuse for them. Check for leaking coolant on your lines. A bad radiator can cause overheating and a bad cap can cause overheating. Make sure the cap is snug. Make sure there are no leaks. Now, the most common issue would be a bad thermostat or a sticking thermostat. Next, I would say would be a bad water pump. Now, it could be the water pump valve or impeller, but that is not common. Also, a bad head gasket can cause overheating. Anyone of these can cause your issue. Check fluid first and fans. You may have a leak or a bad fuse. If the fans do not work, that is probably your problem. They should kick on when the car begins to heat up. If the fuse is good and they still don't work, it is either the wiring or the fan itself. I hope this helps you out. Take care. Rick

Sep 21, 2011 | 1992 Mazda 929

1 Answer

Overheating


OVERHEATING CAN BE CAUSE BY MANY THINGS LIKE FAULTY THERMOSTAT AND FAULTY RADIATOR PRESSURE CAP,TOO MUCH WATER IN COOLANT SYSTEM NEED 50 / 50 WATER AND ANTIFREEZE.LOOK FOR WATER PUMP WEEP HOLE LEAK, IF COOLANT LEAKING OUT WEEP HOLE WATER PUMP BAD NEED REPLACING.CHECK FOR LOW COOLANT LEVEL, YOUR RADIATOR OVERFLOW JUG SHOULD HAVE COOLANT AT THE FULL COLD MARK IF NOT KEEP ADDING COOLANT INTO COOLANT OVERFLOW JUG UNTIL COOLANT STOP DROPPING AND FULL COLD MARK, IF OVERFLOW COOLANT JUG WAS EMPTY RADIATOR IS LOW ON COOLANT.WHICH CAUSE AIR IN COOLANT SYSTEM KEEPING THE ENGINE COOLANT TEMPERATURE SENSOR FROM BEING SUBMERGE IN HOT COOLANT WHICH TURN ON THE COOLANT FANS.WHEN ENGINE COOLANT TEMPERATURE GET CERTAIN SET TEMPERATURE LIKE 190 DEGREES THE PCM AND COOLANT SENSOR WILL TURN ON COOLANT FANS, IF VECHICLE OVERHEATING COOLANT FANS NOT WORKING EITHER YOU HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR CHECK COOLANT FANS FUSE AND RELAYS. YOU CAN CODE SCAN CAR TO SEE IF YOU HAVE FAULTY PCM, FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FAN RELAY.IF COOLANT FAN AND ENGINE COOLANT TEMPERATURE SENSOR OKAY,YOU HAVE CORRECT COOLANT LEVEL IN COOLANT SYSTEM, THERMOSTAT AND RADIATOR PRESSURE CAP BEEN REPLACED, YOU COULD HAVE BLOWN HEAD GASKET CHECK ENGINE OIL LOOKS LIKE MILK SHAKE HEAD GASKET BLOWED ALSO WHEN HEAD GASKET BLOWED YOU CAN DRIVE CAR SHORT DISTANCE START OVERHEATING AND YOU LOOSE ENGINE POWER SUSPECT BLOWED HEAD GASKET.

Aug 04, 2011 | 1999 Oldsmobile Alero

1 Answer

IT KEEPS OVERHEATING


REPLACE THE THERMOSTAT AND RADIATOR PRESSURE CAP.IF COOLANT LOW, ADD MORE COOLANT THROUGH COOLANT OVERFLOW UNTIL COOLANT LEVEL IN THE COOLANT OVERFLOW STAY AT FULL COLD MARK.REASON POUR COOLANT THROUGH COOLANT OVERFLOW MOST GM CARS DONT HAVE RADIATOR CAP.WHEN YOU GET COOLANT LEVEL OKAY, CRANK CAR LET IT IDLE UNTIL ENGINE GET HOT BUILD UP PRESSURE THEN TURN OFF CAR.CHECK FOR COOLANTS LEAKS AT THE RADIATOR HOSES,CHECK FOR LEAKS AT THE RADIATOR, CHECK FOR LEAKS AT WATER PUMP WEEP HOLE IF YOU SEE COOLANT LEAKING FROM WEEP HOLE REPLACE WATER PUMP. IF CAR OVERHEATING WHILE IDLING YOUR COOLING FANS NOT WORKING CHECK COOLING FANS FUSE AND RELAYS.IF FUSE AND RELAYS OKAY THE ENGINECOOLANT TEMPERATURE SENSOR BAD.

Aug 01, 2011 | 1994 Cadillac DeVille

1 Answer

My 97 BMW z3 is overheating and I have replaced the heater core hoses but it is still running hot


Thanks for choosing FixYa and welcome to the site. The most common issue to overheating is a stuck thermostat or a bad one. Next, would be the water pump. You could need a new coolant cap, which only cost a few bucks. You want to make sure that your fans are kicking on correctly. If they are not, check the fuses. If the fuses are good, you may have a bad fan or a bad wire. Make sure there is no coolant leaking. Sometimes, coolant can leak into the oil and is not easily visible to the eye. You may want to check your radiator also. It is possible that you have a bad coolant sensor as well. If your check engine light is on, you should take it to Autozone or Advanced and have it scanned. They do this for free and it might lead to what is causing your car to overheat. I hope this helps you.

Apr 22, 2011 | 1997 BMW Z3 Roadster

1 Answer

Help! I'm stuck and stumped. 2001 Beetle GLS 2.0 - Two weeks ago the car was overheating quickly, red temperature light flashing and beeping. I changed the thermostat, flushed the radiator and filled it...


SOUND LIKE COOLANT FANS HAS A FAULTY THERMO SWITCH LOCATED AT THE BOTTOM OF THE RADIATOR ON LEFT HAND SIDE.CHECK THE FUSES 8 IN THE ENGINE COMPARTMENT AND CHECK FUSE 16 IN THE PASSENGER COMPARTMENT FUSE BOX.WHEN ENGINE OVERHEATING IF BOTH COOLING FANS WORKING.OVERHEATING PROBLEM COULD BE BLOWN HEAD GASKET.CHECK ENGINE OIL LOOKS LIKE MILK HEAD GASKET LEAKING.SEE WHEN YOU DRIVING LOW AND HIGH SPEEDS THE COOLING FANS SUPPOSE TO BE RUNNING.IF THEY NOT RUNNING THAT IS YOUR OVER HEATING PROBLEM.

Feb 02, 2011 | 2001 Volkswagen Beetle

1 Answer

Overheating


CHANGE THERMOSTAT AND RADIATOR PRESSURE CAP.CHECK COOLANT LEVEL.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER.MAKE SURE COOLING FANS COMING ON WHEN ENGINE REACHES 190 DEGREES.TO SEE IF COOLANT FANS RUNNING TURN ON CAR AIR CONDITIONER TO SEE IF FANS RUN IF NOT CHECK COOLING FANS FUSES.IF FUSES GOOD I AM LOOKING AT A FAULTY COOLANT TEMPERATURE SENSOR.IF ALL IS GOOD.NO LEAKS AT RADIATOR HOSES + HEATERS HOSES. NO LEAKS AT WATER PUMP WEEP HOLE OR GASKET.NO LEAKS AT RADIATOR.LAST RESORT CHECK ENGINE OIL. IF LOOKS LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.THAT WILL CAUSE ENGINE OVERHEATING.

Jun 23, 2010 | 2000 Cadillac Seville

2 Answers

Engine on my bmw330ci sport convertible keeps overheating it is a 2001 model with only 57000 miles on clock and well looked after


There are 4 things it could be! First your radiator or cooling fan is not turning on, this could be from a fuse. 2nd your thermostat needs replaced about 3-7 dollars for part. 3rd your water pump needs replace..about 150 to 300 dollars..If you can run for more then 10-15 miles then it shouldn't be your water pump. 4th your low on anti-freeze and need to add some into radiator!
Good Luck!
Hope this helps
PS to check fluid level under hood of car, wait until car is cooled to remove cap. And if you were low, you might want to check underneath your car to see if your leaking anywhere...

Sep 17, 2009 | 2000 BMW 3 Series

1 Answer

1996 ford taurus overheating


it could be water pump, radiator fan, check system for leaks, or you might need a new radiator

thanks

Jun 22, 2009 | 1996 Ford Taurus

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

58 people viewed this question

Ask a Question

Usually answered in minutes!

Top BMW Experts

Fred Sops

Level 2 Expert

271 Answers

Al Clark

Level 2 Expert

290 Answers

Doberman

Level 2 Expert

246 Answers

Are you a BMW Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...