1998 BMW 740 Temperture

Tiny
DAVIDBROWN3524
  • MEMBER
  • 1998 BMW 740
  • V8
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
I think my car is running a little hot, On the guage it stays right in the middle but some time it steam out of the cap under the hood. It has never gotten hot but I just want to fix the problem before it becomes one. I have already relplaced the fan cluch to make sure it is working good.
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Monday, February 23rd, 2009 AT 8:59 PM

8 Replies

Tiny
DR LOOT
  • EXPERT
You may have a bad radiator cap, I wish you would be more specific, is the vehicle using coolant? And if so, have you bled the air out of the system? Get back to me and tell me a little bit more.
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Friday, February 27th, 2009 AT 1:10 AM
Tiny
DR. HAGERTY
  • MEMBER
Also the cooling system has plastic in it and it has a lifespan of 5-7 years. Inspect and pressure test the cooling system. That means the pressure cap too.
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Friday, February 27th, 2009 AT 8:10 AM
Tiny
DAVIDBROWN3524
  • MEMBER
I have repalced the cap, the fan and the problem is still happening. Watwer is going somewhere but I don't know where. I am oedering a book on the car. I was reading in other areas on this web site and it looks like others have same problem.

I read somethinf about the V8 leaking.
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Saturday, February 28th, 2009 AT 1:49 PM
Tiny
DR LOOT
  • EXPERT
You failed to answer my questions, but I did get a new hint from your message "Water is going somewhere but I don't know where" I'm assuming now that you have to add cooled to it, if you don't see an obvious leak in your driveway, the only other place to coolant may be going, is inside your car, pull up the floor mats, take your hand and feel if the carpet is wet, I am not talking about the heater core, if the heater core is leaking it will drain down behind the transmission, it has a right and a left drain for the heater core, what I'm talking about is the junction block that feeds the heater cores located directly behind the engine on the firewall, it is aluminum with three hoses, for some reason on the 1998 BMW, the O-rings fail, or the junction block rots away, from people using the wrong coolant, so check that out and get back to me.
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Saturday, February 28th, 2009 AT 2:13 PM
Tiny
DR. HAGERTY
  • MEMBER
If the valley pan is leaking, you will need that book. I like the Robert Bentley publications, they are easy to understand.
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Saturday, February 28th, 2009 AT 6:18 PM
Tiny
DR LOOT
  • EXPERT
Yes! But the factory OEM manual is way better and more precise, to walk you through it step by step, its just more money.
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Saturday, February 28th, 2009 AT 7:21 PM
Tiny
DR. HAGERTY
  • MEMBER
There is no factory repair manual, it is all on CD or online mate. The Bentley manual derives its info from the factory data base and it is what is recommended.
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Tuesday, March 3rd, 2009 AT 12:34 PM
Tiny
DR LOOT
  • EXPERT
Sorry that's what I meant Dr. Hagerty, ( I was trying to back you up) the Bentley manual is so good, you think you are looking at the factory manual, because it is so good, they cost me about a $100.00 apiece. They are very explicit and very detailed, I have read so many posts on this site, I think I'm starting to suffer from, being nonspecific and very general ( I will not let that happen again). I apologize.
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Tuesday, March 3rd, 2009 AT 2:38 PM

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