Q: Overheating 335xi, new hoses/no leaks, waterpump is fine, no heat, used stop leak but car sat around for 2 months.

asked by on

My car was leaking coolant, and for several reasons which i won't go into, i ended up using a fair bit of stop leak, and then the car sat around for a couple of months. I finally had the hoses replaced and drove around (x4) for 10 minutes before the car overheated. I ensured the coolant was topped up, and it didn't disappear after driving a few times. The oil gauge also ends up past halfway and the car goes in to limp mode. Coolant temp also rises above normal. Slow or fast driving doesn't make a difference. Within ten minutes or so it's time to let it cool down. I hear water splashing around the upper hose to expansion tank after i switch off and open up the hood, which hopefully means that the pump should be fine. Could the radiator be clogged with stop leak? Should i add something to the coolant to dissolve any leftover stop leak? Thank you.

My car has 109000 miles.
My car has a manual transmission.

Hi Marc. Thanks for contacting us today. In most cases, if your heater does not produce hot air, then the issue is that the heater core is clogged with debris. Using stop leak products tends to create this problem. It’s also possible that you’ve got an obstruction of debris within the radiator. In cases where there is an obstruction, a full system flush is recommended to clear the obstruction. If this doesn’t resolve the problem, then it might be necessary to replace the heater core or the radiator.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Overheating 335xi, new hoses/no leaks, waterpump is fine, no heat, used stop leak but car sat around for 2 months.

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

Get a quote

What others are asking

Q: bmw 335i rear main seal

The part required is the seal. A variety of special tools are required to perform the replacement including an engine support bar (and accessories), a transmission jack, a calibrated torque wrench, a flywheel holding tool, a seal removal tool and...

Q: Dash board lights are all on

Hello and thank you for contacting YourMechanic. For all of the indicators that are lit up on your dash could be that the vehicle does need all the problems fixed or it could just be needing a reset. To reset...

Q: Q: VALVE Cover GASKET Replacement

Hi there. Assuming, the valve cover gasket was properly replaced. The smoking under the hood, may have been residual oil burning off the exhaust manifold. The white smoke seen coming through the grill, may have been the snow turning to...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.