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Old 02-06-2018, 02:45 PM   #1
Geehawk
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Default Hot water temps & low brain function ..

Going out in the mini tomorrow, or was at least. Car not run since September last year except for yesterday just to make sure it started.

Just went for a run to fill up with petrol, 10 mile round trip.
By the time I got back the temperature gauge was fast approaching the red, and my auxillary gauge was showing 215 ish.
Basically the gauges were not in their usual places, especially after such a short run.


Under the bonnet it was hot. Top and bottom rad hose hot. Both heater hoses hot. Unscrewed the heater hose bleed and water came out. Unscrewed the expansion tank tap and a little pressure was released but nothing explosive. Stuck my finger in to check the level, and it was where it was when I checked it yesterday … but it was almost cold. Now I can't say I've ever had the need to stick my finger in the tank after a run before, so should the water in the tank be cold?

Apart from HGF (not a bad run if it is I guess for a 92 engine) other things to check first??
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Old 02-06-2018, 03:31 PM   #2
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Thermostat ?
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Old 02-06-2018, 04:28 PM   #3
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If the water in the header tank is cold and and your coolant pipes are hot then there’s either an air lock, knackered thermostat or your pump ain’t circulating!
I would hazard a guess at either of the first 2, I know you said you opened up the bleed screw and coolant cane out but please don’t disregard the fact there may still be an air lock.
To test the stat your going to have to remove it, so you may as well do that, replace if necessary/regardless given they’re cheap and could fit a different temperature one too and drill a small hole in to prevent an air lock behind the stat(they live to do that), then top up the coolant and give a good bleeding.


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Old 01-08-2018, 10:28 AM   #4
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Just to update this post.
I started simple and just fully flushed the system with Speedflush, ran a hose through it every way I could and replaced the expansion tank cap.

That was a few weeks ago now (been on hols etc..)


The other day I finally got round to refilling the system with fresh antifreeze and bled the heck out of it...


Just got back from a 40 mile or so run. Mix of fast A roads, B roads and a couple of town centres.

Happy to report that the temp stayed right where I would expect them to be … a little lower than I remember if anything. Only time the temp crept up was whilst stuck in town centre traffic, but my (manually switched) fan kept it down.

So I'm a happy bunny for the moment.
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Old 01-08-2018, 12:35 PM   #5
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Couple of questions as I hadn't commented on this.

1, do you have any extra holes in the thermostat? This is a cheap, simple trick to help water circulation and stops the thermal shock of hot/cold water once the thermostat opens for the first time each drive.
This also helps with bleeding as often the air lock only cures it'self once the thermostat has opened.

2. Do you have a sealed radiator? If yes then you may do yourself a favour and take it to a specialist to have a bleed screw fitted.

Glad to hear everything has come right. My next advice is use it more!
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Old 01-08-2018, 01:22 PM   #6
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I don't have any extra holes in the thermostat. I recognise that this is a thing to do to help with the fragility of the cooling system, and might at some point, but until this recent issue I've had no apparent problems in 17 years and I'm of the 'if it aint broke' mentality I've even still got my jiggle/joggle valve in situ!

Radiator is sealed. Its a Golf item with plastic tanks so bleed point would be hard to fit I guess.
I do however have a return/bleed line from the top hose to expansion tank (as the Metro did) to help bleed the rad. Also helpful if the gearbox side is jacked up a little.
I have recently discovered a Golf/Polo rad of similar dimensions which does have a bleed outlet on it already, and I might swap to one at some point just to simplify the pipework.


As to your last point I whole heartedly agree, I should use it more. Puts a smile on my face every time I drive it even though it's a lowly 1.4
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