Ayashifx55

Hi guys,

When i bought my civic, the guy had both heater hoses that goes into the firewall by passed so the coolant would circulate only from the engine back to the engine but by doing so, i had no heat but no coolant was leaking.

I plugged everything back to normal accordingly (engine to heater valve, heater valve to firewall and then firewall directly to heater housing) Now i'm losing extremely tons of coolant. For around 15KM , it sucked more than half of the coolant reservoir ..... though i have gained heat for winter.

I see no coolant inside the car (passenger side especially) but i saw traces of coolant leaking below the car (see picture)

Car does NOT leak when engine is on and everything is turning. Car only loses coolant when it moves so i'm guessing leaks only under pressure.
No visible sign from the top ! I checked the whole heater hose assembly , no leak !

Thank you very much for your time.












Most of the coolant are around here , im wondering whats that plug ? It wetted of coolant, in that area, after i drive the car, i can see heat smoke coming out of there (probably because of the leaked coolant)

At the speed im losing coolant, my temporary solution is using water ....

Ayashifx55

bump , please help.
RPM very SLIGHTLY goes up and down on idle

MonkeyMagic

pressure test it.

virgineg6

rev the engine while looking for the leak, did you install brand new hoses? its probably going to be a bad heater valve.

Ayashifx55

merry christmas ! bump!

MonkeyMagic

did you pressure test it?

Ayashifx55

yes i did. Coulnt find any leak while being pressured .... If its pressured, then it means the coolant must be dropping fast so it should be a obvious leak .... maybe ill try pressuring it on ramps.