Question about 1996 BMW 318

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1998 318is coupe heater matrix leak

Hi, my heater is leaking , im guessing its the matrix as i can see steam comming into the car as i drive along, and my coolent levels keep dropping, not fast but they do drop. . . i need help on how to remove or at least inspect the matrix

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Go to these to sites for manual & diagram good luck
Download PDF search | Diagram Selection

Posted on Jul 09, 2009


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Hi breda
your car problem is that, the heater matrix is leaking inside the car.
it cause the coolant level to go down. Probably you have noticed that your car loosing coolant.
good luck

Feb 06, 2014 | Cars & Trucks

1 Answer

Steam coming out the cabin vents

leaking in the heater core and the entire dash must be removed to get it out and replaced . best left to a pro

Oct 08, 2017 | 1990 Daihatsu Charade

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Windows fogging inside car, maybe a vaccum leak?

If you feel warm air blowing up on your windshield and If your heater is working, I would guess its a coolant leak, probably the heater core. Usually a coolant leak will leave a kind of "greasy" fog that is more difficult to wipe off. It is basically steam coating your windows. You should be able to smell coolant if its leaking.
If no warm air is blowing, I would guess an issue with your heater control module or a vacuum problem of not supplying vacuum to move the plenum door.

Hope that helps.

Dec 16, 2010 | 1985 Ford Tempo

1 Answer

My 2000 Mercury Sable is leaking anitfreeze and I am not sure where its leaking from. How can I find out?

open the hood,run the car with a piece of card over the rad (if poss)until its really hot then,with your sleeves rolled up and NO tie,look for a steam jet,if its hot enough, you wont miss it.unless it the heater matrix.but you would smell that inside the car with steamed up windows.(no ac)

Oct 26, 2010 | 2000 Mercury Sable

1 Answer

Coolant is leaking on the passenger side floor inside my car. Light sweet smoke is coming out of the heater and leaves a residue on my windows. I think it is the heater core but I am just not sure.

hi yes your 100% right the heater core/matrix is leaking, the water is dripping down from it which is making the floor wet, and the reason you are getting "steam" on your screen is the hot water that is between the fins on the matrix is cooling causing yes you are right..hope this helped

Feb 23, 2010 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer


So I am guessing the heater core, the only other thing it would be would be any leak that is allowing moisture in the car. is the floor board wet on the passengers side?

Feb 23, 2009 | 1988 Chevrolet Caprice

1 Answer


Hello! This sounds to me like your Heater Matrix is leaking! (inside the vehicle) the smell is probably steaming ani freeze mixed with the damp caused by the leak hence NO warmth from heater. The dealer posibly is fobbing you off as can be a very difficult job.
Even though the leak is happening have you tried a Radiator Seal something like Rad-Weld or Barrs Seal?
Remember to bleed the system to get the air out of the Matrix.
Good Luck and Merry Christmas.
Paul 'W'

Dec 23, 2008 | 1998 Ford Expedition

1 Answer


because some car are equiped with a safety shutoff to stop from overheating the engine to much

Nov 19, 2008 | 2007 Fiat 124

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