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Maybe a sniff test to check for exhaust gas in coolant ?

This. There are a few options that could cause it, best to eliminate the most expensive first 

Could be dodgy waterpump, but can a mechanical waterpump work intermittently ? 

If its got a plastic impeller that's started to break down you could have a bit of plastic fin inside the impeller chamber that gets in the way occasionally and stops the pump spinning. I had a similar issue with a clutch once where a piece of friction material had broken off and occasionally prevented the clutch from disengaging  .

If you can whip the water pump off easily, I'd do this second, if exhaust gasses have been ruled out.

Third guess (and it would be a guess) would be a coolant cap as it could give you similar symptoms as a partially blocked rad but is easier and cheaper to change 

....
I don't know why, but that reminded me of a Welsh mate when I lived in Australia. His favourite chat up line with Aussie birds was to inquire whether they had any British ancestry. If they said yes, he'd say  Lovely... Have you got any Welsh in you?   Would you like some?  

It worked now and again as well!     

Lenny Henry aka Theo Wildebeest was using that line 40 years ago.

https://www.facebook.com/conditionred1/videos/lenny-henry-performs-theopolis-p-wildebeest-1986/285991615402011/ at around 2mins 30sec 

Sons Civic overheating again, with loss of heat from the vents, after being fine since I put a bottle of flushing stuff through it a couple of weeks ago.
Got what I can only describe as thick soap suds type of stuff at the top of the rad when engine is running.
So presumably thats either residue of the flushing agent or head gasket failure.
Ime though HGF would be a stream of bubbles rather than something that looks like the inside of a washing machine before it starts the rinse cycle. 

This started not long after the cambelt & waterpump were changed. Could be dodgy waterpump, but can a mechanical waterpump work intermittently ? 

Had thought of throwing a new Rad on it to eliminate blocked fins, cool spots and the like, but I dont like playing parts darts.
Maybe a sniff test to check for exhaust gas in coolant ?

I have the same thing with mine. I blame the wife putting them on too hot a wash. 

Thanks Steve and Andy. Been hunting around the house for 'funeral clothes'. Haven't needed to wear anything like that for years now, I'm always out with the dog. Got a decent coat and a shirt and tie. Plenty of shoes tucked away, but all of my trousers seem to have shrunk around the waist. Don't know how that happened 

Greenland has a population of around 56,000, mostly Eskimo.

I think that these days you'll find the term Eskimo is considered rather controversial, and some say even offensive M'Lud.

I know, but don't care. ....because these days it's apparently controversial to say a woman can't have a penis.

A woman can't have a penis?  Are you sure?  When did that happen?                                                           

If they play their cards right they can have one whenever they want...

I don't know why, but that reminded me of a Welsh mate when I lived in Australia. His favourite chat up line with Aussie birds was to inquire whether they had any British ancestry. If they said yes, he'd say  Lovely... Have you got any Welsh in you?   Would you like some?  

It worked now and again as well!     

Provided they were heavily intoxicated, or were born with naturally loose knicker elastic.

I've got to go over to Liverpool for mother's funeral on the 15th, so it'll get its six monthly wash before then. I may to ferry people around, so I'd better scrape the mud of the floor as well.

Sorry Steve, I've only just seen this.

Sorry for your loss. 

Got another years ticket on the Big Black Pussy.

Which is always a relief. 

Got another years ticket on the Big Black Pussy.

Greenland has a population of around 56,000, mostly Eskimo.

I think that these days you'll find the term Eskimo is considered rather controversial, and some say even offensive M'Lud.

I know, but don't care. ....because these days it's apparently controversial to say a woman can't have a penis.

A woman can't have a penis?  Are you sure?  When did that happen?                                                           

If they play their cards right they can have one whenever they want...

I don't know why, but that reminded me of a Welsh mate when I lived in Australia. His favourite chat up line with Aussie birds was to inquire whether they had any British ancestry. If they said yes, he'd say  Lovely... Have you got any Welsh in you?   Would you like some?  

It worked now and again as well!