Temperature gauge

Asked by Feb 12, 2017 at 05:56 AM about the 1998 BMW 5 Series 540i Sedan RWD

Question type: Maintenance & Repair

While driving suddenly gauge goes fm
normal running temperature to max high
temp. For several minutes then returns to
normal why?

4 Answers

78,015

Sounds like you have air trapped in the cooling system. BMW's cooling systems are very fussy. They do NOT like to be run hot. I believe there's a bleeder screw at the plastic coolant recovery tank (which tends to crack and leak). If you're unfamiliar with this you should take it to a shop that specializes in imports or your local BMW dealer. Don't take it to a gas station type of garage or chain type of garage. They'll have no idea of what they're looking at on this car! My Nephew learned that lesson the hard way with his '98 528i. HTH. -Jim

1 people found this helpful.
286,015

Several minutes? Once it goes into the red, you need to shut the car off and have it towed to the garage. Like JS mentioned, do not run it hot, as the head will warp and you can crack the block. Let's hope you didn't damage the head gaskets, etc. Replace the all the cooling system parts. Then change the oil and hope for the best. You probably have a leak and or air in the system due to low coolant. The expansion tank is always a culprit as they crack.

1 people found this helpful.
25

The above answers are correct, but I would first check the temperature sending unit, if there are no leaks under the car. If there is air in the system, fluid had to come out somewhere if you don't already have a cracked head gasket and blowing the antifreeze through the exhaust.

1 people found this helpful.
75

could be a sticking thermostat iv seen this happen. fixed 2 with the same problem of your complaint last week.

1 people found this helpful.

Your Answer

5 Series

Looking for a Used 5 Series in your area?

CarGurus has 16,361 nationwide 5 Series listings starting at $900.

ZIP:

BMW 5 Series Experts

  • #1
    Tom Demyan
    Reputation
    2,350
  • #2
    Michael Branan
    Reputation
    830
  • #3
    Robert Charlson
    Reputation
    700
View All

Related Models For Sale

Used BMW 3 Series
843 Great Deals out of 32,787 listings starting at $995
Used BMW 7 Series
119 Great Deals out of 4,876 listings starting at $2,995
Used Mercedes-Benz E-Class
403 Great Deals out of 20,192 listings starting at $1,500
Used BMW M5
621 listings starting at $11,599
Used Mercedes-Benz C-Class
657 Great Deals out of 26,144 listings starting at $1,488
Used Audi A6
142 Great Deals out of 7,754 listings starting at $2,495
Used BMW M3
14 Great Deals out of 1,665 listings starting at $6,599
Used Mercedes-Benz S-Class
118 Great Deals out of 7,214 listings starting at $2,000
Used Honda Accord
458 Great Deals out of 102,117 listings starting at $995
Used Audi A4
217 Great Deals out of 12,765 listings starting at $1,800

Used Cars For Sale

2018 BMW 5 Series 540i Sedan RWD For Sale
3 Great Deals out of 1,035 listings starting at $49,945
2017 BMW 5 Series 540i Sedan RWD For Sale
3 Great Deals out of 71 listings starting at $46,450

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.