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Thread: Heater Problems

  1. #1
    Join Date
    Feb 2003
    Location
    Nashville, TN
    Posts
    1,018
    My Cars
    86 325es 89 325i

    Heater Problems

    1986 325es heater is not working like it should. It blows out warm air but it doesn't get the cabin nearly as hot as it used to. I've replaced the thermostat twice within 6 months time and that did not correct the problem. I haven't noticed any leaks from the heater core. Any ideas would could be the problem? Thanks
    1986 325es
    Count down to 1,000,000 miles: 484,792 to go


  2. #2
    Join Date
    Apr 2001
    Posts
    2,724
    I don't know that much about E30s, mostly E36s, so you might want to take this with a grain of salt. When the heater is on, how hot is the heater core? If it's the same temp as the coolant, you might want to check for airflow through the core - maybe the blower isn't working, or the air recirc isn't shutting, etc.

    If it's not close to the same temp as the coolant, then you should probably look at things like the heater valves, and look for restrictions in the coolant flow. Maybe the core is plugged, or one of the hoses is kinked or plugged.

    Hope this helps,
    Jim

  3. #3
    Join Date
    Apr 2002
    Location
    Virginia
    Posts
    93
    If your car had the cooling system recall done, there is an additional thermostat installed near the firewall going to the heater core. They call it a bypass valve, but it is really just a thermostat that opens to route coolant around (away from) the heater when it gets too hot. You might try replacing that. I just did mine when performing other maintenance and note that my heater is much warmer now. Part number is 64 11 8 391 926 and retails for $15.25 at the dealer. If your's gives a BMWCCA discount you are looking at about $12.96.

  4. #4
    Join Date
    Jun 2001
    Location
    WY
    Posts
    423
    My Cars
    divorced my bimmer :(
    Do you have a microfilter in yours? On mine there was warm air but it barely came out of the vents. I thought my heater/fan was going out but I replaced the filter and now have major air flow and heat.
    BMW Cigar & Gun Club Member # 11

  5. #5
    Join Date
    Feb 2001
    Location
    Northern VA /MD /DC
    Posts
    1,154
    My Cars
    97 M3/4
    Could be as simple as low coolant. Maybe there are some air trapped in the colling system? This was what happened to me recently. The heater started blowing hot air as soon as I finished burping the cooling system.
    <b><font face="Lucida Sans Unicode" color="#0000FF">-E-</font></b>
    <img src="http://www.imagestation.com/picture/sraid37/p4f8aa7f5295c25b9abcea99fcdf6b67f/fd197165.jpg">
    <b><font face="Fixedsys">VROO<font color="#0000FF">/</font><font color="#FF0000">/</font><font color="#666666">M</font></font></b>

  6. #6
    Join Date
    Dec 2006
    Location
    Sarasota, FL USA
    Posts
    52
    My Cars
    2000 Z3 Harley-Davidson Road King
    Had the same problem. Bled the coolant system and topped it off. End of story. Hope your's is as simple.'
    TWP

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