This might sound stupid but, your not putting too much fluid in it are you? It does naturally expand when hot and too much could force it out the cap.
Just a thought.
I disagree with the sucking air from the high pressure side theory. Remember that the pump pushes into the hp hose and sucks from the l.p. hose. If you have an air leak it would more likely be in the low pressure hose. Also, a leak in the hp hose would squirt out of that hole like a fountain.
This is from my 71 Plymouth F.S.M. for A body radio removal. With rally cluster and a/c, in addition to what you have already done, remove the 2 outlet retaining nuts and remove duct. It is also necessary to remove the right defroster hose & hose bracket from back of radio.
Remove bottom...
The first time this happened to me, the scammer either never sent the check, or sent it to the wrong place. Then they were pestering me for their refund. I finally got tired of the game and told them that if I ever received their check, I would take it directly to the F. B. I. I never was...
Here is a picture of a clutch safety switch from a 71 b body. It basically creates a ground when the clutch is depressed allowing the starter relay to activate. If you have a manual shift car from pre-1970, you don't need it. However, if you are converting from an automatic you will either...
If you want to properly dispose of it. First, you cut out the star field of the flag. Doing this changes it from being a flag to simply being two pieces of cloth. Then burn the two pieces. This is the way the Boy Scout troop my son was in did it for the flag retirement ceremony.