Help!! e36 318is cooling issues....

Mr.k

Member
Howsit guys, so i have been having some issues with my 318is, started couple months ago when it over-heated but it never went past 3/4 on the heat gauge. That ended up being my thermostat, a month or so after changing that (Behr part) aswell as my water pump (meyle) just because it was old, it overheated in terrible traffic, that was because of the fan switch failing, so i changed that (from masterparts) and the radiator so i know my cooling system would be basically overhauled but i forgot about the the two plastic pipe connector thing, under the intake and behind the head, and then the day after installing the new rad the one behind the head blows up. I then end up changing both with parts from bmw.

Bringing us to two weeks ago where i was losing a small amount of coolant, about 15mm on the expansion a week of driving (+-200km). After trying to find the leak for a while i gave up, took my car to silverton radiators to do a combustion test to test if the head gasket was blown, it wasnt. They then pressure tested and the brand new radiator poped at the join between the expansion tank and rad. The spares shop i bought the rad from gave me a new rad had it fitted, bled and all was good...... until two days ago when i notice im losing coolant again, about the same amount as before.

I dont know what to do now, can a second brand new rad be faulty ? is the combustion test that silvertons to 100% accurate? is there something im missing or didn't change????

I have checked all the rubber pipes and they all seem good, checked for leaks, especially around the connectors that were changed and at the seam between expansion tank and rad, nothing. Oil is clean, coolant is clean, no smoke or steam from exhaust as far as i can see. I even put white paper on the floor under the car over a few nights, left the car idling for an hour or so with the paper, NOTHING!!!!!!:cry:

Any advice would be helpful.
 

Nikhil

Honorary ///Member
Have you replaced the cap on the expansion tank? or just the expansion tank itself. Also check around the thermostat area for leaks :coolShake:
 

Mr.k

Member
Nikhil@TheFanatics said:
Have you replaced the cap on the expansion tank? or just the expansion tank itself. Also check around the thermostat area for leaks :coolShake:

Yup I have, the new rad came with new cap. I have checked there but will give it a closer look, thanks
 

kilotango

New member
Mr.k said:
Nikhil@TheFanatics said:
Have you replaced the cap on the expansion tank? or just the expansion tank itself. Also check around the thermostat area for leaks :coolShake:

Yup I have, the new rad came with new cap. I have checked there but will give it a closer look, thanks

could also be that they arent bleeding the system properly and you've got air stuck in there.

im not sure of the e36's but the e46/e39's have a very strict way of bleeding the cooling system when its empty or too low. im sure an e36 wizard will chime in soon. good luck!
 

Doomsdaya

///Member
When my car was at Gizmo, he initially replace the leaking radiator with a Behr he bought from GW but that was leaking, he then went on to replace it with an aluminium radiator, its bigger and slightly more expensive but a lot more reliable.

If I were you do another pressure test.
 

uncle j

///Member
Hi

There is rubber gasket between the head and the lower timing cover just above the water pump. They use to perish, usually leaks out just above the were the a/c compressor bolts onto the block, m42 did it a lot, you have a m44 which is very similar, worth checking for marks in that area.

Regards

J
 
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