Question about 1994 BMW 3 Series
Changed thermostat flushed water through with hose , all water ways seem fine and clear , checked that thermostat works in saucepan making sure fitted correct way up on reassembly and still no heat in car and water seems to boil in the expansion tank fluctauating levels in water with the cap off and I have bled the radiator from the top screw
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Posted on Jan 02, 2017
The water (coolant) in the expansion tank will rise and fall with the engine temperature. What the expansion tank does is collect and return coolant to and from the engine. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. The coolant then goes into the expansion tank. Now when the engine cools down the pressure drops in the cooling system and the pressure drop (vacuum) pulls the coolant back into the engine via the radiator cap. The radiator cap allows the cooling system to build up pressure and by doing so increases the boiling point of the coolant, but when that pressure exceeds the caps rating the cap opens and the coolant goes to the expansion valve. The cap has another part to it that when the engine cools down and a partial vacuum is created in the cooling system a "valve" in the radiator cap opens and allows the coolant to be drawn back into the engine. I would look at your radiator cap to see if any gunk or build up is on it, and check the rubber gaskets for cracks. It's easiest just to replace the cap because they are inexpensive and easy to replace (2-10 dollars). The expansion tank should have two hoses on it. The one on the bottom comes from the radiator and the one on the top (possibly part of filler cap) runs down and is open to the ground. That way if it is overfilled or becomes overfilled it will slowly leak onto the ground. When and if you change your radiator cap, make sure the engine is cooled down, remove cap and start engine and turn heater to full blast, full heat. Leave the cap off and let it run until engine warmed up. This should burp out any air pockets that may have happened when coolant was changed. Also top off the coolant in the radiator while it is running. Hope this helps and good luck
Posted on Apr 03, 2009
have you replaced the bleeder screws? and the expansion tank cap they both have O-rings that compress and will fail over time also check the hose at the top of the exp tank it also has o-rings inside it
Posted on Apr 03, 2009
hi jasso, I would recommend checking the water pump if you see no flow in the radiator. Make sure when you fill up the cooling system, that you fill it cold, and that the vent screw in the radiator is loose. fill system until fluid comes out the vent screw. tighten the screw, start the car and have someone run at 1500rpm and check for flow.also, make sure that you have your temp setting full hot and blower on middle speed so that you don't trap air in the heater core.
Posted on Apr 05, 2009
Try locking with key in drivers door lock the urn to unlock position and hold 15 seconds should turn off alarm
Posted on Jul 20, 2009
Testimonial: "Done it myself.But still big thank you"
this sounds like a water blockage, take off the water hose that goes to the engine block, start the engine, and see if there is water flow going to engine...if this is the problem, then you need to buy an engine flush fluid, and flush out your engine....please be carefull, as the E36 320i, has an aluminium head, and is easily warped by heat
Posted on Aug 10, 2009
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