Why my 2006 BMW only overheats in the morning?

10

Asked by Jul 20, 2014 at 09:18 AM about the 2006 BMW 3 Series 325i Sedan RWD

Question type: Maintenance & Repair

I'm in southern California and  every
morning I drive to work.  And about 15
minutes on the freeway, the car shows
overheating and will not let me accelerate.  I
pull over and  waited for about 5 minutes
and it would drive fine after that.  It doesnt
do this any other time of the day.

Recently, the coolant symbol shows its low.
I checked the reservoir tank and filled it up
with non bmw coolant  I also noticed theres
residue of coolant around the tank where
the cap is. This morning it does it again, but
it took multiple times before it drives
normal again.

I appreciate if anyone can help me with this
issue.

5 Answers

24,405

Yes, it is an issue- if you overheat your engine you can damage it severely and that BMW engine is expensive- please try to fix whatever is wrong before this happens- check your cooling system for leaks- it also could be a bad thermostat or sensor- or, or, or , or- if you do not feel competent to maintain your BMW find a good, honest, mechanic who can do it for you- if you don't have the money to pay a good BMW mechanic, find a way to get it- or trade it in on a Toyota-

2 of 2 people found this helpful.
269,275

Jamn is right. From your post, it sounds like the expansion tank is leaking. Time for a new one. But you might have already done some damage as BMW's don't like to be overheated....http://www.e46fanatics.com/forum/showthread.php? t=878931

1 of 1 people found this helpful.
73,845

Also check for a sticking thermostat. Sounds like the thermostat is not opening fast enough when you start off cold. But after that it's fine because the engine is warm enough that the thermostat doesn't close all the way again until it sits overnight. HTH. -Jim

1 of 1 people found this helpful.
Best Answer Mark helpful
10

I appreciate the quick response everyone!! The expansion tank does show some leak at the cap area. And From all the suggestions received, could it be where the thermostat is not opening fast enough and causing the pressure to build up and the cap at the expansion tank is the weakest point causing it to leak out. Doesn't BMW have an automatic shut off so it will not allow the vehicle to accelerate? My wife has been driving like this for awhile and it shows no sign of damages. Not that I want to continue doing this but do you think further damages could occurred even if it's drive able and damages are not noticeable?

1 of 1 people found this helpful.
73,845

I wouldn't keep driving and heating it up. You run the risk of warping or cracking the head. BMWs don't like being overheated. HTH. -Jim

Your Answer

3 Series

Looking for a Used 3 Series in your area?

CarGurus has 33,007 nationwide 3 Series listings starting at $1,200.

ZIP:

BMW 3 Series Experts

  • #1
    Tom Demyan
    Reputation
    5,270
  • #2
    Robert Charlson
    Reputation
    1,690
  • #3
    grolyate
    Reputation
    1,290
View All

Related Models For Sale

Used BMW 5 Series
450 Great Deals out of 16,099 listings starting at $1,032
Used BMW M3
38 Great Deals out of 1,935 listings starting at $5,999
Used Mercedes-Benz C-Class
832 Great Deals out of 25,872 listings starting at $1,500
Used Audi A4
235 Great Deals out of 11,992 listings starting at $1,899
Used Ford Mustang
425 Great Deals out of 41,426 listings starting at $1,488
Used Mercedes-Benz E-Class
559 Great Deals out of 22,145 listings starting at $1,800
Used BMW 6 Series
75 Great Deals out of 2,421 listings starting at $5,995
Used Honda Accord
900 Great Deals out of 77,283 listings starting at $1,495
Used BMW X5
288 Great Deals out of 15,172 listings starting at $2,695
Used BMW 7 Series
107 Great Deals out of 5,080 listings starting at $1,600
Used Dodge Charger
454 Great Deals out of 34,583 listings starting at $2,000
Used BMW X3
273 Great Deals out of 9,086 listings starting at $2,995

Used Cars For Sale

2018 BMW 3 Series For Sale
7 Great Deals out of 6,092 listings starting at $31,076
2017 BMW 3 Series For Sale
122 Great Deals out of 3,672 listings starting at $23,489
2016 BMW 3 Series For Sale
49 Great Deals out of 1,159 listings starting at $14,991
2015 BMW 3 Series For Sale
129 Great Deals out of 3,372 listings starting at $14,926
2014 BMW 3 Series For Sale
282 Great Deals out of 4,335 listings starting at $11,979

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.