Artley

Is the coolant system on a 635CSi under pressure? ....Because seems to be is. Am I looking at a blown head gasket? Or is this normal? - there are no other signs of trouble. the oil's clear, the coolant is clear, the car runs fine. However, the temp needle flickers a bit every now and then. Can you get bubbles in the matrix?

Any suggestions?

Cheers

Art

KC Ron Carter

no pressure but the system can lock in air so there is a bleeder port on the thermostat housing.

I would suspect the sender to gage connection is getting resistance build up.

Here is a picture of the connection, see figure 3.

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Artley

Do I take it from your post that the mechanism that opens the bleeder is governed by a temperature sensor rather than a pressure sensor?

Because if my car isn't overheating how does the bleeder know when to open?

Also any clues on how air gets trapped in the first place?

Cheers

Art