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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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#1 (permalink) Old 01-28-2005, 09:12 AM
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My car only blows luke warm air. The engine temp is fine, and all of the vents are set to the right position. My local shop wasn't sure what was wrong.

I think it's probably the coolant diverter valve not opening enough to let 100% of the coolant to flow to the heater core. The shop thinks it's the flaps not letting the heat from the core to be blow directly to the vents.

Anyone have any ideas?


Driving 45 minutes to work everyday with -20F temps sure does suck!
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#2 (permalink) Old 01-28-2005, 11:12 AM
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Could be either of the items you mentioned or a failed temp sensor. The one in the air ducts, not the one that displays the outside temp on your LCD.

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#3 (permalink) Old 01-28-2005, 12:20 PM
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you might want to check the heater control valve
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#4 (permalink) Old 01-28-2005, 05:21 PM
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Same problem. Living in Minnesota with some cold ass days and no heater sucks. My heater isn't blowing hot air and my AC doesn't blow cold air. My car came from Texas-do u think the thermostat could be to blame for the non hot air?
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#5 (permalink) Old 01-29-2005, 11:31 PM
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TTT hopefully someone else might chime in on this with some insight.

Former Nissan 240sx owner...

Now BMW owner...

and not missing the 240 too much
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#6 (permalink) Old 01-30-2005, 03:12 AM
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might be your water pump. OEM pump is weak and often breaks and causes serious problems anyway. Replace it with one with bigger impellers and it will flow more coolant over the heater core, giving you hot air.

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#7 (permalink) Old 01-30-2005, 09:13 AM
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It's your microfilter under your glovebox. Replace the filter. It tends to collect alot of gunk, leaves, hair, lint and dust and restricts proper air cirulation. Thus A/C air is warmer than desired and Heatiing is cooler than desired....cause after awhile it's just diverting air into your cabin from outside.

These Filters is an easy DIY and should be done every 10,000 miles.
See the DIY section.


Delmarco out.....

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#8 (permalink) Old 01-30-2005, 01:49 PM
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I replaced mine at about 85,000 and MAN IT WAS DISGUSTING!!! It was practically pitch black! I probably have allergies from it now...


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#9 (permalink) Old 01-30-2005, 02:16 PM
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Filter was replaced this summer. I'm leaning towards the coolant valve. This weekend the temps were in the mid 30's. Not exactly warm out, but it was warm enough to allow the car to make some heat. It seems like there is some coolant flowing to the heater core, but not enough on the bitter cold days.

Has anyone changed there coolant valves themselfves? I tried tapping it with hammer and socket to see if the vavle would unstick. It looks like it would be a major pain in the ass to replace!
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#10 (permalink) Old 01-30-2005, 03:04 PM
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No it may not be the valve! I just replaced my coolant and had my valves and all the components checked and replaced at the BMW dealership last november (and as you know when it comes to taking your dough they don't miss a thing)! Anyway...Early Jan. I had the same problem as you when the temp dropped to around 1-10 degrees F. I found my car did not heat up at all. And the air was warm, also my engine stayed cold for longer (which is normal) So I found out I needed to replace my filter. I did but the cabin heats up now like normal, but certain days when it's really cold I find that the heating is somehow related to the engine temp. when the engine is cold the air that comes out the vents is NEVER hot but gets warmish. I guess this seems normal cause its the reality for most older cars like ours.

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#11 (permalink) Old 01-30-2005, 03:47 PM
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My filter is only six months old though, and I don't live in a dusty neighborhood. I haven't had to drive through any construction on a daily basis either. I'm finding it hard to believe that my filter could be clogged after half a year.
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#12 (permalink) Old 02-14-2005, 05:00 PM
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my heater and defrost only blows hot air when I push the gas, is that the same thing?.. jjust change the filter?... help is appreciated... thanks... later

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#13 (permalink) Old 02-14-2005, 08:20 PM
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ok my problem on my bimmer is that when i set it to defrost it gets hot but when i set it on the feet or to the face it blows cold. could this be the filter? and the a/c just blows air and the a/c condensor is full with the chemical stuff.

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#14 (permalink) Old 02-14-2005, 08:48 PM
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check your coolant level, and then add some if needed and then bleed it. this is probably the reason why you arn't getting the warm air desired. there is a little screw that has a plus on it (its plastic) and its right next to the cap on the overfill reservoir. turn on the car, and open up the screw and keep adding coolant, squeezing the upper hose and revving your engine a bit untill you see a nice steady flow of coolant comming from the scerw. then close it back up and you should be all set.

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#15 (permalink) Old 02-14-2005, 08:54 PM
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Quote:
Originally posted by 3serbmdubya@Feb 14 2005, 08:48 PM
check your coolant level, and then add some if needed and then bleed it. this is probably the reason why you arn't getting the warm air desired. there is a little screw that has a plus on it (its plastic) and its right next to the cap on the overfill reservoir. turn on the car, and open up the screw and keep adding coolant, squeezing the upper hose and revving your engine a bit untill you see a nice steady flow of coolant comming from the scerw. then close it back up and you should be all set.
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why would be be the coolant? isnt that suppose to cool the engine which makes no sense because I want hot air to blow. correct me if im wrong and what about my ac?

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