Hissing Sound from behind water pump
03-21-2009, 11:27 AM
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Hissing Sound from behind water pump
93 Civic Coupe EX, 1.6L, 5sp, 250k miles
I've had a slow water leak for several months and I can smell antifreeze on hotter days. From time to time there would be a hissing sound (stream) from behind the water pump area. The engine has lots of miles (over 150k) and I have no service history.
Hoping it would be something cheap I replaced the connecting tube o-rings and the hose which connects to the tube.
Took it for a quick drive with only water in the radiator, same sound from behind the water pump.
Could it be the water pump?
I've had a slow water leak for several months and I can smell antifreeze on hotter days. From time to time there would be a hissing sound (stream) from behind the water pump area. The engine has lots of miles (over 150k) and I have no service history.
Hoping it would be something cheap I replaced the connecting tube o-rings and the hose which connects to the tube.
Took it for a quick drive with only water in the radiator, same sound from behind the water pump.
Could it be the water pump?
03-21-2009, 01:50 PM
#2
Re: Hissing Sound from behind water pump
The noise might be caused by air trapped in the cooling system. Push the heater lever to max heat, drain all the water (=bad) out of the system, refill with 50/50 coolant, and then bleed the system:
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