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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 01-14-2013, 01:35 AM
E30sixer E30sixer is offline
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Heating issue

I have an issue with my cars heat when I first bought the car it worked great ,, as does the AC too now the AC still works but the heat doesn't blow hot air only cold . I live in Pa definitely need heat ..I've tried narrowing down this issue but it doesn't seem to be neither thermostat nor water pump I replaced even have new hoses not that it would solve the problem but replaced only because they were there can't think of anything else .. Any suggestions would be greatly appreciated ..

Last edited by E30sixer; 01-14-2013 at 02:21 AM.
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  #2  
Old 01-14-2013, 06:05 AM
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miles_trail miles_trail is online now
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I'm assuming coolant level is good and you bled the system properly after the hose replacement.
You should check the valve that let's coolant into the heater core.

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  #3  
Old 01-14-2013, 11:44 AM
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drivinfaster drivinfaster is offline
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wait....wut???

if you replaced the thermostat and bled the system properly, and are not overheating, then you should have plenty of heat.

you *could* have a restricted heater valve, or heater core, but you will need to use a proper infra red thermometer to get accurate temp readings.

otherwise you're going to be guessing.

and guessing gets expensive....


i say go back and double check the cooling system is bled. these are tough enough for experienced automotive technicians, so it has been my experience that almost 90% of diy'ers that have done this have not done it properly.




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  #4  
Old 01-14-2013, 12:32 PM
E30sixer E30sixer is offline
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Correct no overheating issues , though I was once told about the heater valve i don't know where it's located ,, and assuming the bleed system wasn't done the correct way what would be the proper way to bleed my system ,,,?
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  #5  
Old 01-14-2013, 01:51 PM
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Quote:
Originally Posted by E30sixer View Post
Correct no overheating issues , though I was once told about the heater valve i don't know where it's located ,, and assuming the bleed system wasn't done the correct way what would be the proper way to bleed my system ,,,?

From here:
http://www.bimmerdiy.com/


Id suggest going here:
http://www.pelicanparts.com/BMW/tech...lant-Flush.htm

and following the steps they recommend.

Once you've gotten all the air out, start from the beginning and do it all over again, because you've still missed some air.
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  #6  
Old 01-15-2013, 05:49 PM
E30sixer E30sixer is offline
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I couldn't help to remember . And I know it sounds stupid but . Could it be that from leaving the cap off on your rad an blowing coolant everywhere then putting coolant back in it cause this problem which would mean that there is air in the cooling system ?? Lol I know it sounds foolish but I did forget to tighten the cap on it one time
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  #7  
Old 01-15-2013, 05:53 PM
E30sixer E30sixer is offline
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I will be doing a complete coolant flush on my e36 this weekend updates will be posted ..
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  #8  
Old 01-15-2013, 05:59 PM
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Yes, having the cap open while driving will induce air into the system.
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  #9  
Old 01-15-2013, 07:20 PM
E30sixer E30sixer is offline
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of coarse hey thanks a lot jonesin
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  #10  
Old 01-18-2013, 03:41 PM
E30sixer E30sixer is offline
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I did the coolant flush as instructed in the links an the car only has heat when running after I'm stopped for a little while the heat goes away .. I dont know what else to diagnose I'm stumped right now ... ??? I need heat in my e36 I live in a very cold area I'm originally from SoCal not used to this **** ...
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  #11  
Old 01-18-2013, 04:33 PM
E30sixer E30sixer is offline
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Help anyone I'm trying to get my e36 up to par I just bought it not too long ago and I want to be able to have it running at 100% this isn't the first issue I'm sure ill be throwing tons of things out there to pick your brains .. And mine
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  #12  
Old 01-18-2013, 04:33 PM
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hornhospital hornhospital is offline
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You still have air in the system. If you drive it like that it's going to overheat.
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  #13  
Old 01-18-2013, 04:41 PM
E30sixer E30sixer is offline
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I took it around the block nowhere too far . Just trying to figure out how it still ha air in the system how long do I let the car sit for with the bleed plug open .. ??
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  #14  
Old 01-18-2013, 04:43 PM
E30sixer E30sixer is offline
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Another thing I was going to ask is it normal for an e36 to run just a tad hotter on the temp gauge like just barely .. Or does that mean I'm overheating ? Because it never shoots up just stays there steady
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  #15  
Old 01-18-2013, 04:54 PM
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Quote:
Originally Posted by E30sixer View Post
I took it around the block nowhere too far . Just trying to figure out how it still ha air in the system how long do I let the car sit for with the bleed plug open .. ??
Until the bubbles stop. Even the tiny ones. Then do it again/more.

Quote:
Originally Posted by E30sixer View Post
Another thing I was going to ask is it normal for an e36 to run just a tad hotter on the temp gauge like just barely .. Or does that mean I'm overheating ? Because it never shoots up just stays there steady
The temp gauges on BMWs are buffered. It will indicate straight up if it's anywhere in the neighborhood of normal temperature. If it's indicating a little high, it may just be a gauge glitch, or it might be actually running a little hot.
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Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13
buying a ratty example (of a BMW) is a parasitic relationship.(and you ain't the mosquito) 7pilot

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
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  #16  
Old 01-19-2013, 11:17 AM
E30sixer E30sixer is offline
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Hey thanks a lot seems to just be a gauge glitch I hope .. I'm actually going to be bleeding the system again today.. Hoping I can get all the Air out this time
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  #17  
Old 01-21-2013, 07:57 PM
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Bimrpwr Bimrpwr is offline
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try to clean the heater core. Lot of people will flush it out with CLR for about 30mins. and then Back flush it as well..
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  #18  
Old 01-23-2013, 12:22 AM
E30sixer E30sixer is offline
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How would I flush heater core because when I was doing the coolant flush I let the car run for a lot longer than 30 min to let air bubbles out but still not any heat coming through only when I drive it around the block did it throw a little heat then as soon as I came to a stop it blew cold air ... compete fail
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  #19  
Old 01-23-2013, 12:40 AM
E30sixer E30sixer is offline
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And also how would you even begin to back flush the system this is a sad sad story I feel like a fool that I haven't been able to get this fixed
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  #20  
Old 01-23-2013, 06:07 AM
Theo podges Theo podges is offline
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I think this must be your heater valve.

On the right-hand drive cars they are situated on the fire-wall by your inlet manifold (two metal dome like pieces with coolant pipes running into them). When mine was disfunctional they kept the heat on no matter how you adjust the climate control.
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  #21  
Old 01-23-2013, 12:23 PM
E30sixer E30sixer is offline
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Many thanks I was aiming towards the heater valve after all this nonsense .. I haven't been able to have my fun this winter cause no heat .. Ill be checking the heater valve Friday it's a little cold out 5 degrees cold right now
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  #22  
Old 01-23-2013, 02:05 PM
E30sixer E30sixer is offline
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And another thing my car Is LHD ?? Don't know of its any different
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  #23  
Old 01-23-2013, 03:24 PM
cj32769 cj32769 is offline
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I had the same problem and had to add more coolant and bleed it even more now my heat has two settings off and cremate.
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  #24  
Old 01-23-2013, 08:13 PM
E30sixer E30sixer is offline
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Haha sounds like the setting I need
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  #25  
Old 01-23-2013, 08:14 PM
E30sixer E30sixer is offline
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.. I will be bleeding this car again and again till it blows heat I mean everything was replaced Idon t understand this is definitely turning out to be a huge headache
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