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I don't get it. What is wrong with the cooling system remaining pressurized? Mine does and always has.
>>>> You have a copression leak if.... <<<<
You have a compression leak into the cooling system. Residual pressure is the classic symptom. (The next thing you will see are tiny smoke-filled bubbles in the cooling water.) You are going to have the tear the engine down to fix it.
>>>> Why there is no residual pressure normally <<<<
The very first time you fill the system, it is possible to have some residual pressure when the system cools down. After that first time, there should never be residual pressure. This is because any vapor you create by heating will condense back to liquid when you cool down again. Actually, the water expands and pushes some air out of the system into the catch tank. When it cools back down, the water contracts and draws a slight vacuum. This will suck water back in from the catch tank.
>>>> Why you might possibly have residual press the first time after you change the coolant <<<
The first time you heat up the water, you will drive out some dissolved air. After you thermally cycle the water once, this dissolved air is gone. Thus, you may possibly see a tiny pressure remaining the first time, but never again.
>>> Smoke-filled bubbles = compression leak into the cooling system <<<
If the compression leak is severe, you can sometimes see little smoke-filled bubbles in the coolant. Fill it to the top and don't put the cap back on. Run it at idle and little smoke-filled bubbles may be seen rising to the top. If you see these, you definitely have a compression leak into the cooling jacket.
You don't always see the smoke-filled bubbles, by the way.
Bill Dube'
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