I have a BMW 318 is coupe, when i am driving around town in and out of work the temp gauge sits in the middle and heater works fine. However when i go on the motorway the gauge drops to the top of the blue cold not below that and the heater does not work so good. can you help?
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i see answers to other questions here except the question asked about no heat in a 325 xi 2001 blower works great fluid is full no leaks,fuses are fine,get a lil heat while at a stand still but as soon as you drive cold air only temp on max 91, engine temp right in the middle takes about 8 mins for temp gauge to reach the middle can anyone help with this..PLEASE !!!!!!
Your description of the problem is not very clear. It seems as if your temp gauge does not work, or does not indicate the correct temperature.
If you disconnect the wire from the sensor unit and put it to battery negative (ground), the gauge should move to the full hot position. If this does not happen the best chance is that the gauge does not work. If it does work, the sensor is faulty. In a very unlikely situation, the wire could be faulty..
hows your temp gauge ?? in the middle ??
if so you have a restriction in your system or air.
bmw's are very famous for getting bubbles on the system and can overheat your vehicle so check your coolant level " on an incline "
re-fill if needed. turn it on with the radiator cap of. let it run for about an hour with your heater at the highest, keep track of your temp gauge and your coolant. refill to specs " marks " without putting the cap on. let it cool of for another hour, check coolant level again, if you had air it will be low, refill again and you should get hot air like crazy
1st thing to check is the coolant level. Low coolant level results in no, or little heat (not enough coolant to circulate thru the heater core). What does your engine temp gauge indicate? (or is it just a warning light?) If the car is running at what appears to be lower than normal temp., u may have a thermostat that's stuck open. This would cause the engine to not reach operating temp, and u would not have heat. Check the above 2 items 1st, then let me know what u found. If that doesn't fix it, we will continue, let's do the easy and not too expensive stuff 1st!