Temperature problems...

Hi Wayne, I have two problems. I have 325tds and 318tds. With 318, during summer, it was overheating, then I changed waterpump a thermostat, but it was the same. I put it aside and took it out for a ride during winter. It is not overheating now, which seems kind of strange. Anyway, sometimes not always, the coolant gets out of of the container/filler during the ride underneath the screw top. Could the cold weather be the reason why it stays cool? Will it start overheating again during the summer?

And for my second problem. It is not actually a big problem, but with my 325, the problem is the opposite. It never stays warm, temperature is usually somewhere between blue and the middle, unless I rev it a bit.

Thank you

__________________
This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: BMW 3-Series E36 Cooling System Flush

[Wayne 962]

The coolant system is regulated by the radiator cap - pressure is released through the cap when it gets too high. If your cap is leaking, then it's time to get a new cap and that might fix the overheating problem. The pressure in the coolant system is required to keep the water / coolant from boiling over. If there is a leak, and the pressure is too low, then the coolant will boil off, and you will have overheating problems.

As for the 2nd car, if the temperature is between blue and medium, that might be normal. We don't have the tds diesel cars over here, so I'm not sure exactly at what temperature they are supposed to run.

- Wayne