I am replacing my heatercore and i heard that u can bleed the air out of it, i looked on ogre's webpage but could not find it anywhere on his page, does anyone know the proper way of bleeding the heatercore? or is it just the simple way of running the car with the thermostat out at the engine till it boils all the air out then putting it back in?

thanks all for reading / for replys / comments

Matt

The running-without-thermostat method has always worked for me. The sequence I use is to run the engine for 10-15 seconds, shut it off, then check / top off the coolant. Repeat as necessary. Running the engine for only 10-15 seconds at a time won't heat the coolant enough to pressurize the cooling system.

quote Originally posted by Blacktree: The running-without-thermostat method has always worked for me. The sequence I use is to run the engine for 10-15 seconds, shut it off, then check / top off the coolant. Repeat as necessary. Running the engine for only 10-15 seconds at a time won't heat the coolant enough to pressurize the cooling system.

Yep, also a replacement 195F or 30C..? thermostat is recommended if you want all that summer heat

Jim

[This message has been edited by FieroJimm (edited 12-15-2008).]

Will it help to get the air out if you jack up the rear end of the car so it'shigher than the radiator ?

The cooling system on the Fiero is self-bleeding assuming the pump is working correctly. Air bubbles get pushed through the system and accumulate at the radiator filler neck. Each warming cycle the air is pushed out into the reservoir by thermal expansion, and each cooling cycle the system pulls liquid coolant back in from the bottom of the reservoir. No need to pre-fill the heater core, just install it and go.

JazzMan

It must be possible for air bubbles to get "caught", however, because the "burping" procedure when filling the cooling system wouldn't be necessary otherwise.

quote Originally posted by pswayne: It must be possible for air bubbles to get "caught", however, because the "burping" procedure when filling the cooling system wouldn't be necessary otherwise.

the burping just makes everything happen quicker. being a sealed system, with the rad cap on, you can easily end up with a radiator full of air. but, yes, even if not burped, and, you keep the resevoir full - it will work the air out. but, its only a little at a time.

quote Originally posted by pswayne: It must be possible for air bubbles to get "caught", however, because the "burping" procedure when filling the cooling system wouldn't be necessary otherwise.

I have no idea why people "burp" their cooling systems. Whenever I work on mine the refill procedure is to fill at the back until coolant comes out the radiator neck, put the cap on, top it off in the back and the reservoir, put the thermostat housing cap on with no thermostat, and start it up. After 10-20 seconds I shut it off, top off at the back, put the thermostat and cap back on, then check the reservoir daily for a few days until it stabilizes.

The only way bubbles wouldn't get pushed through is if the pump is very weak or one of the cooling tubes is mostly crushed and restricts flow; otherwise the flow rate is sufficient to push air out of everywhere it can hide in a Fiero cooling system.

JazzMan