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Boiling sound after replacing timing belt and water pump

Old 10-25-2009, 01:18 AM
Join Date: Oct 2009
Location: California
Posts: 4
Default Boiling sound

Air is commonly trapped inside the cooling system after a major service like that, the easiest way is to let the engine completely cool back down, perhaps even overnight just to be safe and pop the radiator cap off and top off the fluid, it is usually low. On some cars there is a bleeder screw on the thermostat housing that is used to also let out that air and I'm pretty sure you do that when the engine is fully warmed up and at an idle. Way easier and safer to let it cool down and top it off, then if still doing it may need to try to bleed the system. The noise you are hearding is the trapped air bubbles going through the heater core inside the dash board.
Old 10-26-2009, 10:18 AM
JimBlake's Avatar
Super Moderator
Join Date: May 2006
Location: Wisconsin
Posts: 17,456

4-cylinder engine?
Use the bleeder valve when the engine's cool. Open the radiator cap then open the bleeder until the air comes out & the stream is all-liquid. Top up the radiator & put the cap back on.
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