Technical Questions and Discussions - Burping coolant system

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Burping coolant system

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Topic: Burping coolant system

Posted By: waynrayn
Subject: Burping coolant system
Date Posted: 06 April 2012 at 2:47pm

Hi there:

I'm in Victoria, on the island... I've just changed the non-A/C heater core on my 87 Fiero SE.

I'm now ready to "burp" the coolant system. There are several online descriptions of this that I've read, so I get the idea. But as I refill the thermostat housing and run the engine for a few moments several times to get the fresh coolant into the system, eventually what level should the coolant come up to in the housing? I.e. should it still be below the thermostat, when I push it back in? Or would this leave air in? Should the thermostat be immersed?

The thermostat itself has a rubber lip, a gasket, so it seals down tight on the metal lip inside, seeming to indicate that the coolant should be under it. But doesn't this leave air still inside?

Sorry for the novice question. Thanks...

Replies:

Posted By: bcampbell
Date Posted: 06 April 2012 at 6:18pm

waynrayn wrote:

Hi there:

I'm in Victoria, on the island... I've just changed
the non-A/C heater core on my 87 Fiero SE.

I'm now ready�to "burp" the coolant system. There are
several online descriptions of this that I've read, so I
get the idea. But as I refill the thermostat housing and
run the engine for a�few moments�several times to get the
fresh coolant into the system, eventually what level
should the coolant come up to in the housing? I.e. should
it still be below the thermostat, when I push it back in?
Or would this leave air in? Should the thermostat be
immersed?

The thermostat itself has a rubber lip, a gasket, so
it seals down tight on the metal lip inside, seeming to
indicate that the coolant should be under it. But doesn't
this leave air still inside?

Sorry for the novice question. Thanks...

Someone correct me if I'm wrong but I think the coolant
needs to be filled to the top of the housing. The
thermostat probably has a rubber lip so that the coolant
is forced to flow through it rather than around (once
operating temp is reached, the stat will open and coolant
will flow more rapidly).

You're lucky you get to remove the thermostat for filling
your engine :). With my LX9 swap it took forever to get
the coolant filled. What part of Victoria do you live
in?

Posted By: waynrayn
Date Posted: 06 April 2012 at 8:04pm

Hi:

Yes, your answer appears correct from another posting I finally got at Pennock's Fiero forum:

http://www.fiero.nl/forum/Forum2/HTML/121993.html - http://www.fiero.nl/forum/Forum2/HTML/121993.html

... I'm in Saanich. Cheers...