1993 E36 318i - Intermittent Overheating

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  1. 1993 E36 318i - Intermittent Overheating 
    #1
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    steve1810's Car Details
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    Ive had my 1993 318i E36 for a while now, had a problem with overheating and couldnt solve it so i changed the radiator and the thermostat, ever since then its been fine apart from the fact every month or two the heating problem comes back, i bleed the system and everythings fine again, surely i shouldnt have to bleed the system once every couple of months to stop the car overheating in traffic?

    Once im moving the car cools down, obviously through the air flow keeping it that way but once im still ever month or so it will start overheating and the heat just rises and rises until im on the move again!

    Any help, advice or suggestions welcomed!
     
     

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    check the fan rotates without any slipping...a rolled up newspaper helps
    you could change the rad cap as the seals dont last forever
    what i've felt,what i've known
    never shined through in what i've shown.

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    Quote Originally Posted by steve1810 View Post
    Ive had my 1993 318i E36 for a while now, had a problem with overheating and couldnt solve it so i changed the radiator and the thermostat, ever since then its been fine apart from the fact every month or two the heating problem comes back, i bleed the system and everythings fine again, surely i shouldnt have to bleed the system once every couple of months to stop the car overheating in traffic?

    Once im moving the car cools down, obviously through the air flow keeping it that way but once im still ever month or so it will start overheating and the heat just rises and rises until im on the move again!

    Any help, advice or suggestions welcomed!
    Have you changed water pump when you put thermostat?
     
     

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    or convert to electric cooling fan and ditch viscous as they are not much cop and rob engine of power and its not that difficult
     
     

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    My E36 had the same problem. I took it to a garage and he diagnosed a water pump (e36 are notorius for the plastic water pump ). For a while it went great but it was pumping water up through the filler cap on my header tank. Anyway to cut a long story. Turned out to be my head gasket.
     
     

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    steve1810 (13-12-2009)

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    Replace your radiator cap then try bleeding the car using the following procedure

    How to bleed the cooling system.
    1.Jack the front of the vehicle up onto stands as high as possible,
    2.Turn the ignition on,engine off,heater on fan setting 1 and temperature fully hot,
    3.Remove the rad cap/expansion cap,remove the bleed screw from the radiator and IF you have them the bleed screw(s) from the thermostat housing/top hose, return pipe or EGR thermostat.
    4.Fill the radiator up and keep pouring till there are no more air bubbles coming out from the bleeds, using a funnel that fits tight in the radiator neck and filling it full of water will help push any troublesome air out, when good you can then install the bleeds and tighten down(don't snap them),ensure the rubber O-rings/seals are still on the screws/on the bleed holes.
    5.Suck some water out so it's not full to the brim, replace the cap and then start the car. Run her up and check for heat from the vents when warm and check if over heating still persists. You may have to bleed troublesome cars twice(but rare).
    6.If all is good then check the water level again in the morning when cool.

    If you keep overheating it the headgasket will go
     
     

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    steve1810 (13-12-2009)

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    Quote Originally Posted by dazza316i View Post
    or convert to electric cooling fan and ditch viscous as they are not much cop and rob engine of power and its not that difficult

    Ive been thinking about doing that for a while actually mate, im guessing youve done it?

    Any ideas on the best size/power of the fan?
     
     

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    As already said, check the viscous coupling on the fan, then consider the waterpump may be faulty.

    I would consider replacing the waterpump with a metal impeller on it and then bleeding it as suggested by STK above.

    Failing that, then my guess would be the head gasket, you can buy a sniff tester from somewhere like ebay that may help to diagnose this problem
     
     

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    Quote Originally Posted by steve1810 View Post
    Ive been thinking about doing that for a while actually mate, im guessing youve done it?

    Any ideas on the best size/power of the fan?

    got one from scrappy from r reg 325 with radiator which was bigger to start with and electric fan all fits in with original mounts
    i did this on my e36 saloon after testing with a cooling fan from alfa 156 worked a treat so searched out a bigger radiator and it had electric fan attached
    have just bought the one outta my old car will post a few pics if your interested when i fit it at the weekend you can wire to a switch or spal or kenlow do a thermostat control
    which ive seen on ebay for 25 pound im also fitting a secondary fan in front of rad as doin acouple of track days next year and that will be wired to a switch in cabin (poss rear window switch blank) so can be turned on when req
    and run with ign off for cooling when parked up
     
     

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    steve1810 (14-12-2009)

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    Quote Originally Posted by dazza316i View Post
    got one from scrappy from r reg 325 with radiator which was bigger to start with and electric fan all fits in with original mounts
    i did this on my e36 saloon after testing with a cooling fan from alfa 156 worked a treat so searched out a bigger radiator and it had electric fan attached
    have just bought the one outta my old car will post a few pics if your interested when i fit it at the weekend you can wire to a switch or spal or kenlow do a thermostat control
    which ive seen on ebay for 25 pound im also fitting a secondary fan in front of rad as doin acouple of track days next year and that will be wired to a switch in cabin (poss rear window switch blank) so can be turned on when req
    and run with ign off for cooling when parked up

    Yeah a few pics of that will be good mate, might be an idea to put that in the diy section if u have the time, if not it'll still be a good help to see em mate
     
     

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