pentaq

A victim: Accord Wagon with F20B3 engine.
Replaced:
-coolant twice (system has been flushed before)
-thermostat
-radiator
-3 (three) rad caps (one new and two used in working condition)

As the engine is getting hot the coolant is pushed out to the reservoir- normal. But when the engine cools down the coolant is supposed to be sucked back to the system, but it's not... So after a few starts/stops the reservoir is overfilled (of course coolant is on the garage's floor) and the engine starts to overheat.
What is the reason of such a situation?
I'm sure fans are working...
Help.

JimBlake

Check the hose over to the reservoir. It should be airtight & it needs to extend all the way down into the reservoir. If there's a leak in that hose, it's like trying to drink thru a straw with holes...

Another thing to check, but probably OK since it's all new... Check the largest seal in the radiator cap & radiator neck. Any small nicks in the surface will suck air instead of coolant as the engine cools down.

pentaq

Oh one more thing... The reservoir cap doesn't screw in well. It was squeezed before so the inlet hole is like oval shape. I'll take a closer look at the hose...

JimBlake

The reservoir cap doesn't have to seal to the reservoir bottle. There's an air vent there anyway.

Use a vacuum tester (MityVac or some kind of syringe) to check the tube. Disconnect it from the little nozzle at the radiator cap, & try to suck coolant out from the reservoir bottle. If you get air bubbles, then you have to figure out where they're coming from.

pentaq

unfortunately it didn't help. I suspect my HG is gone.