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-   -   Heater not working (http://www.bimmerfest.com/forums/showthread.php?t=672246)

osikani 01-25-2013 05:06 AM

Heater not working
 
Folks, for the past month, the heater is not working properly; it's been intermittently. Since Monday there's no heat at all in this severe cold weather in NorthEast. I've read a lot of posting here, some says it's the heater valve, FSU, cooling system flush etc.

This is what I did this morning, I check the heater valve and it's cold. I set the temperature to 60 F and switch to cold and cold air comes alright, then switch to 90 F and still cold air but not as cold as 60 F. Then change to 90 F and switch to heat and no air comes at all. Check the air at the cabin filter under the hood and it's cold. Finally, car temperature is cold just above the blue mark, never got to middle since Monday.

I need help now since I'm freezing in this brutal weather.

Thanks for you help!!!

JKRIT 01-25-2013 05:37 AM

Your last remark, that the engine temp only gets just above the blue mark, indicates that the thermostat is stuck open. I would start by changing that, keeping in mind the technique needed to bleed all the air out afterwards.

doru 01-25-2013 07:19 AM

Could be a bad auxiliary pump. Bottom left side (driver side) of the radiator.
Usually when this one goes out, there's no heat in the cabin.

To check: Open the expansion tank cap, car in "P", key in pos2, HVAC set to your normal heat comfort.
You should hear the coolant gurgling, and also see a stream of coolant (if it's topped off) coming from the upper snaked hose that sits on top of the radiator. If nothing happens, the pump is dead and needs replacing.

Good luck.

houckjf 01-25-2013 02:54 PM

Heater not working
 
1999 528I - have the same problem with the added issue that the temp gauge is pegged all the way in the RED Don't know what to do or check.:dunno:

Steve530 01-25-2013 05:48 PM

Start with checking the coolant level.

houckjf 01-25-2013 06:09 PM

thanks for the rely but the :thumbup:coolant level is good

Steve530 01-25-2013 06:15 PM

Did you check the water pump belt?

houckjf 01-25-2013 06:17 PM

No I haven't will look at hat in the morning

houckjf 01-26-2013 05:25 AM

checked water pump belt and it is good

bmwoem1 01-26-2013 05:30 AM

If the engine temp never gets to normal than you have a stuck thermostat.... I have the occasional plugged heater core, but I would change the thermostat first

Steve530 01-26-2013 07:44 AM

Quote:

Originally Posted by houckjf (Post 7339225)
checked water pump belt and it is good

First, as you know, severe engine damage can result when your engine overheats. So you need to address this issue immediately.

Second, I assume that the temperature gauge is operating normally. That is, it starts at the cold mark and moves toward the hot mark as the engine heats up.

With the symptoms you describe, no cabin heat and the temperature in the red, it appears that the coolant is not circulating through the engine. That could be because the thermostat has failed closed. Or maybe the water pump has failed and is not pushing water into the engine.

Either way, it appears that you need a cooling system overhaul. You should probably check the cylinder compression to assure there is no engine damage.

jygesq 01-26-2013 07:54 AM

replace thermostat first
 
if temp gauge if left of straight up, you thermostat is stuck open .

houckjf 01-26-2013 04:27 PM

Thanks for the tips I really appreciate them will post what I find when its fixed and I'm no longer freezing my .......off driving to work lol

the1t 01-27-2013 02:08 PM

try changing the fsu, i had a similar problem and that fixed it.. the part is cheap and you can change it yourself in 10-15 mins.. you can pick one up with warranty from ebay:thumbup:

houckjf 01-27-2013 02:21 PM

FSU? what is it and where is it located?

the1t 01-27-2013 02:37 PM

Final stage unit.. Its in the footwell on the right hand side.. If you type it in on you tube theres 10 videos on how to do it.. Guaranteed scratches on ur hands :mad:

JKRIT 01-27-2013 04:28 PM

Quote:

Originally Posted by the1t (Post 7341744)
try changing the fsu, i had a similar problem and that fixed it.. the part is cheap and you can change it yourself in 10-15 mins.. you can pick one up with warranty from ebay:thumbup:

Changing the FSU brought your temp gauge down out of the red?

the1t 01-27-2013 04:32 PM

No but it fixed the problem with the hot and cold air.. Worth a shot for what it costs i reckon

JKRIT 01-27-2013 05:18 PM

houckjf may indeed have a dead FSU disabling cabin heat, but overheating a BMW I6 is a much more serious problem, as pointed out by Steve530. Houckjf should not be "driving off to work" that way.

osikani 01-27-2013 05:37 PM

I changed the thermostat and heat is now back. Thanks guys, u r the best.

houckjf 02-16-2013 12:49 PM

thanks all for the advice, replaced thermostat and water pump now I got HEAT LMAO>>>>>:thumbup::rofl::bow::beerchug::clap::banana:

Steve530 02-16-2013 02:37 PM

Glad you got it fixed.

kmorgan_260 02-16-2013 02:50 PM

Quote:

Originally Posted by jkrit (Post 7336830)
your last remark, that the engine temp only gets just above the blue mark, indicates that the thermostat is stuck open. I would start by changing that, keeping in mind the technique needed to bleed all the air out afterwards.

+1


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