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Question Coolant bleeding problems.

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2 years 11 months ago #2622 by Winniebongo
Winniebongo created the topic: Coolant bleeding problems.
I have done this process before with success but we had to change a hose and re-fill the coolant. I then bled the system and the process seemed to go fine, we took it a 25 mile run and it was fine. 25 miles back, fine, out the next day another 25 miles, then on the way back it started to push coolant out of the expansion tank overflow. I thought at first it was going to just reach a level but then the gauge started to climb and nothing we could do would stop it, so AA recovery truck home.
My feelings were maybe we didn't get all the air so we bled it again, twice but both times we coudn't get it to a stage where there were no bubbles coming out in the funnel, last process we did took 2 hours and I was not long home from a hard day's work and just couldn't go any longer plus I didn't believe it was going to get any better, so I stopped.
I wondered if maybe it is drawing air in somewhere, so tonight I checked all the connections, nipped up any jubilee clips I had off recently and checked all the levels, all seemed fine. we went a short run, it reached normal operating temp quite easily, bottom hose hot so thermostat open and we stopped and checked the levels again, all seemed fine. A few miles down the road though it started pushing out coolant at the expansion tank again, bottom hose cold by this time and there was a ton of steam and pressure inside the bleed hose and not so much coolant. I checked the temp of hoses and so on with a laser gauge and nothing was particularly hot, except the cylinder head which was at 100 degrees, so I am guessing no coolant in there.
In all this it has never actually been overheated, the gauge at it's absolute highest read about 3/4 then we switched off, Can anyone shed any light on what might be happening, if air is getting sucked into the system, the its not a seepage at a hose clamp if you ask me, as it seems to be loads of air in just a run of 3 or 4 miles, any assistance greatly appreciated.

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2 years 11 months ago #2628 by haydn callow
haydn callow replied the topic: Coolant bleeding problems.
Hi, you say the gauge went up to 3/4 then you switched off.......remember that once switched off the temp continues to rise and this can de 10-15 degrees due to heat soak....
You may have goosed your head.....the temp gauge is pretty useless, once it moves it can be too late. Get a digital gauge / alarm fitted. Do you have a low coolant alarm.?

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2 years 11 months ago #2633 by Winniebongo
Winniebongo replied the topic: Coolant bleeding problems.
Thanks for your reply. I am still working on it, carefully.
When I said 3/4 I meant at the absolute highest it may have just touched it but we did thankfully, catch it pretty quickly and switched it off so fingers crossed it will be OK.
Where I am with it now is as follows; I did another bleed and seemed to get more air out. Took it a run but the fans are coming on pretty quickly, gauge reads fine and I just returned it home and switched off. I think the head is hot, possibly being full of air, Laser temp gauge reads 90-100 degrees on the front metal parts of the head but at the same time only about 60 degrees in the bleed pipe just next to it. I am not sure if 90 degrees is normal or not, everyone seem to talk about coolant temp and not the temperature of the block or more importantly the head.
I am pretty confident there are no leaks now, air or otherwise but I do think there is still air in the system. The AA guy checked it for head gasket issues and it came up OK, since then we have been working on it and treating it with kid gloves but still working on it so that's not to say nothing has gone wrong since.
I have however bought a pressure bleed kit, it came with zero instructions so I am learning as I go. Tonight I got it to work, almost, it is holding vacuum so that's good news and confirms the no leaks situation but I couldn't get the pressure up as high as I wanted, although it did everything else as it was supposed to. I know what the problem was (lack of air in the compressor tank), so tomorrow I will make sure everything is charged up and have another go.
We don't have a coolant alarm, never felt it was necessary before, I don't suppose you know anyone who sells them? :)

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2 years 11 months ago #2634 by haydn callow
haydn callow replied the topic: Coolant bleeding problems.
Google.....haydn alarms. ??
The following user(s) said Thank You: Winniebongo

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2 years 11 months ago - 2 years 11 months ago #2635 by teenmal
teenmal replied the topic: Coolant bleeding problems.
Did your AA man carry out a sniffer test?
Re the low coolant alarm they are readily available on Ebay at a very reasonable price.





Take care
Last Edit: 2 years 11 months ago by teenmal. Reason: duplication
The following user(s) said Thank You: Winniebongo

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2 years 11 months ago #2653 by Winniebongo
Winniebongo replied the topic: Coolant bleeding problems.
Hi, Thanks to you both :)
I think I know the test you mean, it;s a little glass bowl with blue liquid in it? If that's the case then yes he did the test and all was fine.
Pressure bleeder didn't work at all with the Bongo, ended up worse than it was to start with, I guess due to air in the system. Bulkhead forward was all calm and cool, bulkhead back was screaming hot, Mmmmmm will keep that one for newer cars.
Anyway has another go at the see-sawing and got a better result this time. Done a few short journeys since and, don't want to say it's fixed yet but the signs are fairly good. One negative is the rad fans seem to come on more than before, could we have done in the temp sender?

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