1990 Honda Accord radiator fluid leak, cause unknown


Engine Cooling problem
1990 Honda Accord 4 cyl Front Wheel Drive Manual 113000 miles

So, I replaced my valve cover gasket. Easy job to do once I took it all apart and looked at it. I had to actually pry it off with a prybar and scrape some of the old gasket off(made sure I didn't leave debris in there). However, I now have an insanely slow leak of coolant where the top radiator hose connects to the engine directly below and to the left of the valve cover.

the leak is coming from where it connects to the engine, not a hose(replaced hoses and upgraded radiator in '07).

I'm just looking for a name for this part, and perhaps how serious this issue is. I'm still letting my rtv cure so I haven't started the car up yet to see if I start puffin white smoke out of my exhaust. Should I refrain from testing out my new valve cover gasket until I resolve this slight leak?

I have discovered this is my "Water outlet gasket". Does this indicate water pump failure, or did I perhaps crack the very old gasket by hammering and prying on the valve cover? My newer question in a nutshell is this: How do I know if anything more than a replacement gasket is the culprit?

Do you
have the same problem?
Saturday, March 6th, 2010 AT 12:24 PM

1 Reply


Either it is the thermostat housing outlet.Because the top radiator hose is always connected to the thermostat housing, the lower radiator hose is connected to the water pump.

Thermostat housing outlet.
Use a pair of pliers to compress the spring clamp, then slide it up the hose and disconnect the hose from the housing.


Remove the nuts/bolts securing the thermostat housing ...


then remove the thermostat housing..


Once the housing is removed, the thermostat can be removed from the engine


Using a putty knife, clean the gasket mounting surfaces.

If the thermostat is equipped with a pin valve, be sure to install the thermostat with the pin facing upward.

If you think it is your water pump, here is the location


Inspect for signs of seal leakage or deterioration.
Note: small amount of weeping from the bleed hole is normal.
(see diagram).

Was this
Sunday, March 7th, 2010 AT 9:49 AM

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