Q: Overheating and leaking during driving

asked by on May 27, 2016

My car has been overheating lately. It doesn't happen while it idles, but during the first 4-6 miles that is has been running. There is also some leaking that I saw under the car after driving it. There are no leaks while the vehicle is idling though. What could be the underlying issue? Thanks.

Car is overheating Inspection $79.99 - $89.99 Get a Quote

BMW had a TSB (technical service bulletin) out for a casting flaw where a leak could develop on the lower right side of the cylinder head. Good news though, that was on the M52TU engines and you have an M54 engine, so you are not affected by that bulletin; it’s a good thing because the fix is a new cylinder head.

Common leak areas are under the thermostat housing, and the bottom of the coolant reservoir. Look for a white residue in these areas to see if a leak has developed. If no leak is present in one of these two areas, a cooling system pressure test may need to be performed to locate the leak.

Please note: never open or service the engine cooling system while the system is hot or pressurized or serious injury may occur.

You may want to enlist the help of a mechanic, such as one from YourMechanic, who has the expertise and training to inspect your overheating issue, then locate and repair the cooling system leak, if that is the cause of your issue.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

I have a 2007 BMW 328xi and sometimes I have to put the key in a few time to push to start the car

There is a module in your car that communicates with your key before allowing you to start the car. It may be having trouble recognizing your key. It could be a problem with the key, or a problem with the...

Shifting issues, check engine light on

Hello there, a few different things could potentially cause this fault. The most common would be a neutral safety switch, transmission shift linkage fault, or a transmission fault. A technician will first inspect the Check Engine Light for exactly what...

My 2001 Audi TT Quattro didn't want to engage first gear so I forced it in and I was stuck on first gear even if I clutch it won't

There are two possibilities: there is a clutch or clutch control (hydraulics, etc.) malfunction or the synchronizer and/or related assemblies in the transmission itself is faulty. To distinguish between the two and thence pinpoint the issue, the recommended service is...

Transmission light illuminated

Hello. Thanks for writing in about your 2008 BMW 750i. If the transmission light is on, there's a 98% guarantee that the transmission has developed a flaw. I suggest that you attempt to have the trouble code retrieved by a...

Engine and low trac lights come on

Hello. There are several things that could cause the Check Engine Light to come on after getting the spark plugs replaced by the dealership. If the Check Engine Light never turned off after the original repair was completed,...

All wheels are slightly bent and one wheel is cracked

When the vehicle's rims develop these type of cracks, they should be replaced immediately. The cracks can make the wheel unstable and should not be driven on until it is repaired. The most common causes of trims cracking in this...

my check engine light came on a few weeks ago and said it was coolant issue light went out and a few days ago it came back on

Your vehicle has less than 60,000 miles and inasmuch as you mention a possible fault in the engine cooling system, you should check for warranty coverage under Chrysler's 5 year/60,000 miles powertrain warranty. If you are not covered under the...

Car running hot

The coolant may not be leaking, but fumes from the overflow can be smelled when it is running hot. Your vehicle should be checked to see if the fans are working, and the thermostat is okay. A pressure test for...

my beetle burning oil

The specifications for the engine oil on your vehicle should be on a sticker under the hood. Normally, it is located on the radiator cover, the front of the hood, or on an emission sticker near the firewall. The information...

Related articles

Symptoms of a Bad or Failing Stay Rod
Common signs your classic car has a failing stay rod include rattling noises from the front and a radiator that looks tilted or about to fall.
What is Rear-Wheel Drive?
For For the better part of the twentieth century, nearly every vehicle on the road had the engine sending power to the rear wheels. This arrangement makes a lot of sense to designers, with the rear wheels handling all of...
What Is the Difference Between a 4-Stroke and 2-Stroke Engine?
Four-stroke and two-stroke engines have similar components, but don't work the same way. Four-stroke engines are often found in off-road vehicles.