Why my 2006 BMW only overheats in the morning?


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

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

5 Answers


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 out of 2 people think this is helpful.
Tom Demyan

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 out of 1 people think this is helpful.

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 out of 1 people think this is helpful.
Best Answer

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 out of 1 people think this is helpful.

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

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