What path does the coolant flow? 1988

[AZVET]

I recently replaced my intake manifold and managed to mess up the metal pipe that goes from the lower part of the passenger side manifold to the heater hose.

I discovered a leak when I filled the radiator with new coolant.  As the radiator filled up the coolant leaked at the heater pipe/intake manifold junction.  Engine off at the time and engine was stone cold. And  yes, I installed a new O ring at that junction.

I always thought that no coolant entered the engine until the thermostat opened.

Fortunately our friend Jim Finn was able to get me a good used pipe quickly and at a decent price.  He even painted it so it looked like new!

Jim has saved my bacon again!

 

[D-a-n-i-e-l]

Thermostat allows coolant to leave the engine and once it hits a set temp. 

If it went the other way your heater would take forever to warm up.

[Fox W.]

Jim has saved us all once or twice.