Thread: Expansion Tank Cap, check yours!

I found exactly the same thing on mine when I bought the car, could be a week point or just a problem if they are dropped, well worth checking

how is it going to make the motor over heat with that missing, i would have thought it would run cooler ??

Originally Posted by richard4u2

how is it going to make the motor over heat with that missing, i would have thought it would run cooler ??

Well if you found yours broken are you going to take a chance???????

in the past in other cars when i have been out and about and a leak has developed in the cooling system i have cut that spring off complety so there is no build up of pressure and that would reduced the loss of water and would get me around okay and the car would run just as good

yep,,
but lack of pressure also means lower boiling point,,,

Originally Posted by richard4u2

in the past in other cars when i have been out and about and a leak has developed in the cooling system i have cut that spring off complety

Have a hard look at the pictures, there is no spring, this is not an old style rad cap. There are 2 O rings on the cap and they must be there for a reason. If the bottom one falls off because the plastic is rotten or broken it cant be beneficial to the cooling system.