IWINULUZ

iTrader: (10)

I have been slowly getting my FD back on the road after many years. I finally got my temperature to stabilize at 85C. I drove it around the neighborhood probably not even close to a mile of driving once i pulled in back into the driveway i noticed i have a slight drip from lower radiator hose which probably just need to move the clamp closer up on the neck of the radiator. But then about 3-4 hours later i go back out into the garage and notice that my upper radiator hose has collapsed shut, i unscrew the thermostat housing cap (radiator cap) and upper hose goes back to normal size again. very strange to me. why would this happen? and how to fix?

AzEKnightz

iTrader: (24)

What was your coolant level after removing the radiator cap? That's an indication of vacuum usually if the system is full, it wouldnt have the same problem. I say throw a new radiator cap on there, and see what you get =).

Also check for clogged return hose at the reservoir. However, a problem like this usually is the radiator cap failed to allow air back into the system neutralizing the vacuum.

-AzEKnightz

AzEKnightz

iTrader: (24)

The Radiator Cap in gasoline engine has 2 features:

1. It helps hold pressure until a set point when it allows pressurized air to come out. Usually set at 2 bars or so.

2. When engine cools down, it must allow air to re-enter the cooling system to return to "zero" pressure state.

Look at the tiny flap inside the radiator cap and you will see.

When feature #2 fails, you get collapsed hose.

IWINULUZ

iTrader: (10)

Well i have two caps a high cap and a low cap, which comes factory on FD? I'm using the one that has the gasket not attached to the actual cap. If that makes any sense.