Coolant still in expansion tank after draining from engine and radiator — BMW E46 (2003 330i)

What happens if you overfill coolant BMW E46?

An over filled coolant system will push coolant out the cap and any overflow tube attached to the reservoir at the filler cap neck. It will do no harm to the car.

How do you bleed a BMW E46 cooling system?
Or the air-conditioning turns on turn your heat all the way up. And leave your fan speed all the way on low. Because you want to open that heater core valve. So you get coolant in there.

Does antifreeze go in expansion tank?

The cooling system is constantly under pressure with the use of an expansion tank. Instead of sending the expanding coolant to the tank once it reaches a certain pressure, the coolant is always cycled through the radiator and out to the expansion tank.

What happens if you overfill BMW coolant?

That “expansion” tank is supposed to be mostly air – leaving room for the coolant to expand and compress the air as the coolant heats up. If you overfill it then it will come out the escape valve and suck air back in – air in the system can cause levels to vary and bring on the alarm. – top up coolant to proper level.

Can you start a BMW without coolant?

No problem at all. You could easily run for 1 minute but maybe not more than that.

What is coolant level in BMW?

The level is full when the bottom of the float reaches flush with the top of the cap. Add OEM BMW Engine Coolant mixed at 50/50. If the float is all the way down, you need to add coolant. If the float is sticking up, your BMW coolant level is full.

How do you get air out of BMW cooling system?
Because we have to put it uh uh we have to dilute everything 50 to 50 or whatever table you're following on the backside of your container. It will say 60 to 40 or 50 to 50 depending on the climate.

How much coolant does a BMW E46 hold?

Engines used in the BMW E46 models hold about 8.5 liters of ethylene glycol- water mix, while M3 E46 models hold 10 liters. In this article, I will go over the steps involved with replacing the engine coolant on the BMW M52 and M54 engine.

How do you bleed a BMW with a mechanical water pump?
But what you will hear is once you're running this you'll hear the electric water pump kick in and if you want to be sure that the procedure is actually initialized. Go ahead and pop your hood.

Why does my coolant reservoir overflow after driving?

Coolant, or antifreeze, is essential to regulating the temperature of your vehicle. It’s also extremely toxic and designed to stay inside a closed system. If you’re seeing an overflow, it could be due to a radiator cap, thermostat, water pump, or radiator malfunction.

What happens if you put too much coolant in the reservoir?

When you overfill the coolant reservoir, there won’t be much space left for the heated coolant to expand. As a result of which, the pressure inside the reservoir would increase gradually. When this happens, the cap of the tank will open, and the hot coolant would pop out like a puddle of lava.

How do you get water out of a coolant tank?
Take off the radiator cap or in this case the reservoir cap and that'll just allow air to come through here. So there won't be any suction if the water stops draining.

How do you bleed the coolant on a 2001 BMW 325i?


  1. Start with a cold engine (front of car must elevated)
  2. Remove the cap on the expansion tank.
  3. Remove the bleeder screw on the expansion tank.
  4. Put a catch pan under the expansion tank area.
  5. Slowly fill the expansion tank until you see no bubbles coming out of the bleeder hole.

How do you bleed a 323i cooling system?
You need to keep going all the way until you see liquid coming out and probably add another covert until it is liquid and no bubbles at all.

How do you bleed a M54 engine?

Re: How to: Bleed Coolant System (M54)

Park it facing up hill, or get the front end on ramps/axle stands then put the keys in position 2, heat on full, fans on low, undo bleed screw and it should self bleed. Refill until the expansion tank is half full (to the line).

Why does BMW use blue coolant?

We recommend using BMW’s “Blue” coolant in your car because it is silicate & phosphate free, and has a much longer lifespan inside of your car’s cooling system.

How much coolant does a 2003 BMW 325i take?

The owner’s manual and Haynes say 11 liters.

How do I add coolant to my BMW 330i?

How to Add Coolant: BMW 330i (1999-2006) Base 3.0L 6 Cyl.

  1. Find Reservoir – Locate the coolant reservoir and clean it.
  2. Check Level – Determine the coolant level.
  3. Add Coolant – Determine coolant type and add fluid properly.
  4. Replace Cap – Secure the coolant reservoir cap.

Why does my BMW have 2 coolant tanks?

The second smaller expansion tank is for your coolant-based charge air cooling. It’s essentially a separate coolant system with its own electric pump and expansion tank. You assumed the low coolant level warning was for the main coolant system.

Can I put water instead of coolant in my BMW?

While you can drive the car for a short time using water in place of the coolant, it won’t effectively protect your engine. This means its essential to get the problem that caused a low coolant level fixed as soon as possible, and the radiator filled with a 50/50 ratio of coolant to water.