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windsor318is
06-16-2010, 10:15 AM
So my inpatient cousin had her 99,000k e36 rad replaced last week along with waterpump and thermostat. the backyard mechanic who did the work didnt bleed the rad properly so it was overheating from all the air in the system.
this is at what point i went and had a look, since ive replaced and blead mine quite a few time, which i thought this would be a 15 min fix. first off, the car was cold when i got there, and when i loosed the rad cap it was under pressure...that ive never seen before. i ran the car for at least 45min, and i couldnt get the car to overheat, or get the system to build any pressure, i was able to remove the rad cap with no pressure build. i unscrewed the bleeder screw and no cooloant overflow, even though i had the thermostat crack and added at least another litre of coolant in.

anyone ever run into this? my only thought is that they put the wrong thermostat in, or put it in wrong? any comments or suggestions are all welcome, i told her not to drive it for know, since i know the rad still isnt blead properly.
thanks

E36is
06-16-2010, 10:32 AM
bring it back to the mechanic, at this point if you work on it any further, the mechanic can just say that you tampered with it and the blame will be on you.

Walkman
06-16-2010, 07:47 PM
Thermostat might have been put on the wrong side

Bleeding procedure, I had coolant bleeding issues as well

- Jack the front of the car, so bubbles will come out easier
- Turn on the heater, high speed, +30 deg
- Open bleeding screw
- Start the engine
- Pry both radiator hoses (upper one many times at many differents spots)
- Add coolant (the coolant level should decrease)
- Add coolant until it comes out from the bleeding screw when you pry the upper rad hose
- Put the cap back on and let the bleeding screw open until air comes out
- Close bleeding screw and let the pressure build up
- add coolant when the car will be cold

windsor318is
06-16-2010, 09:14 PM
like i said, theres no pressure build for that, and i had the heat on full blast, i might have to see what they did with the t stat, any other suggestions?

Walkman
06-17-2010, 04:19 PM
Like I said...
No pressure means that you have a air bubble in the system even if you think you bleed it correctly

Or an UFO clogged somewhere in your system, but it seems the thermostat to me