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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 12-17-2004, 09:36 PM   #1 (permalink)
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I recently installed a new O2 sensor and replaced a cracked radiator...due to overheating etc. Everything replaced correctly no more leaks...BUT now I have NO heat even at full blast etc....car no longer overheats and needle goes only to halfway...but no heat...what did I do wrong...? ghead any suggestion will be appreciated!
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Old 12-17-2004, 09:40 PM   #2 (permalink)
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you might have air in the coolant. try to turn the car on and let it warm up, then open the little screw on top of the radiator and let some air out. open it very slow and have a towel around to wipe up the coolant. it would help to have someone in the car reving and feeling for the hot air to come out of the vents. hope this helps!!!
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Old 12-17-2004, 09:46 PM   #3 (permalink)
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Yeah I unscrewed that lil plastic screw on top of radiator next to the reservior etc. and let it sit for atleast 15min etc. notice many bubbles popping out as well till nothing came out now what else...why does getting the bubble out matter?
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Old 12-18-2004, 07:18 AM   #4 (permalink)
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Air in the system means the coolant will not flow to all the places it needs to sufficiently.

Does the TEMP gauge increase to normal range?

Your next step should be check the thermostat. When it fails, it usually fails in the open postion so coolant always flows never allowing the engine to heat up enough.
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Old 12-18-2004, 08:15 AM   #5 (permalink)
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Did you open the valve while you had the dials on the climate control system set to *full hot*? That's the only way the valves will open up all the way on the heater core...

Eric
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Old 12-18-2004, 10:39 PM   #6 (permalink)
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Thermostat is stuck open and is letting all the hot engine water flow through the radiator, cooling it off to much, and not letting your engine temp and cabin heat exchanger get any warm return fluid.

Bubbles will pop in the reservoir if the cap is on or not (unless you've overfilled it past the line) Removing the cap wont help bubbles flow from deep in the engine's crevasses into the reservoir.
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