Originally Posted by zuper8
Wow... didn't see this one coming. You know how it was leaking coolant and I didn't know where it was going? (let'* see if I explain this right) My mechanic looked at it today and said that my radiator cap was only giving 5 psi instead of 16 psi, and that was causing the coolant to just keep burning, which is why it was steadily disappearing as I drove. Or something like that. It made sense when he said it
But I was so sure it was the intake! Does this happen a lot?
Doesn't make sense to me either.
If your cap was only providing 5 psi, I would think that the coolant would be under less pressure internally and less likely to leak out your bad gaskets. If it were summertime, a higher pressure on the system would raise the point at which the coolant boils, but that is hardly a concern in February. But, unless I am missing something (always possible) if you do have an internal leak (coolant disappearing - no external leaks to be found) a cap that provides 11 additional pounds of pressure on the system will just encourage a small leak to become a larger one. Now, if coolant were leaking out the cap because it was bad, then a new cap might help, but if that were the case, you should have seen evidence of that as an external leak.
There are some cases where more pressure can seal a leak, but it is not as likely as more pressure making the leak worse.