Cleaning coolant expansion chamber

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mikeonb4c
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Re: Cleaning coolant expansion chamber

Post by mikeonb4c » Thu Nov 27, 2008 2:39 pm

spout wrote:I've been off work today, and as it was so nice I brought forward the weekends chore and have changed the coolant.

There was some surface crud in the expansion chamber, but as Haydn suggested the plastic itself was fairly opaque. Looks like I'll have to get one of those alarm things :wink:

I followed the bleeding proceedure but my bottom hose took ages to finally warm up, and after an initial water loss through the bleeder (when I started the engine) very little came out at all, just a couple of burps. Coolant in the expansion only dropped about an inch (once btm hose warm).

So how do I really know it's been bled successfully?

Hmmm. Did you follow the workshop manual procedure, with all those run at tickover for 2 mins then 2500 for 5 mins advise etc. and repeat instructions? I seem to recall a nice solid flow of hot coolant out my bleed pipe was my confirmation that circulation was good and that air seem to have been properly expelled, so a lack of that with yours puzzles me. Out of interest, have you fitted a new thermostat just to be safe? Not expensive. How long does it take your temp gauge to move off the stop towards operating temp (mine takes, at a guess 2 miles of driving on a cold morning, before changing the thermostat it was double that). 8)
spout

Re: Cleaning coolant expansion chamber

Post by spout » Thu Nov 27, 2008 2:57 pm

No, I didn't renew my thermostat. Maybe next time. Didn't seem to be having any troubles, just thought it advisable to renew coolant as we don't know much of its history.

Yes, I did follow the procedure. And that's what confused me. Blocking the bleed pipe once warm seems a little odd - how does it continue to bleed through the remaining rev cycles?

On advice from Haydn I'm going to re bleed using the seesaw method just to put my mind to rest.

Ta for everyones input.
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