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https://www.abi.org.uk/products-and-issues/choosing-the-right-insurance/motor-insurance/winter-tyres/

Pleased for you Sure others will find your post helpful in the future.

It appears to be 100% sorted now and my heating had improved massively! The car is toasty warm inside... Anyway after all the faffing I decided to go against the instructions and fit the O rings into the recesses of the new heater matrix first, add lubricant then fit the pipes. As you can guess they slotted in perfectly! I took them out again checked the O rings to make sure they didn't jump past their seated lip and went ahead with doing them up. I ran the car up for temp for about 30 minutes just to be sure I just left the ECU aside and all the plastic airflow pieces off to inspect the matrix. The pipes and matrix soon got hot and I've just replenished the system with water for now but I will be getting the correct coolant asap! So just to finalize the new matrix is a worthy buy in this case I had to get one but if your heating is poor it seems swapping out for this type makes a huge difference my matrix must of been really bunged up! I must mention when fitting the new matrix I decided to do the cutting trick and hacksaw the plastic edge which means you loose one ECU mount screw point but it improves the accessibility massively. Some attached photos to show some difference from the old and new:

In what way? - for better for worse?

Toyota show what can be used on you car. Just put in your vin and choose winter. It seems that although my Yaris came with 16 inch alloys, for winter I can go down to 14": https://www.toyota-tech.eu/euro5search/index?PUBTYPE=TYRE#

Or in British Rail speak, we get the wrong type of snow! 😉

I agree. I drove in some quite atrocious conditions in the 1970s and 80s, in the likes of Fiat 127 and original Ford Fiesta. They coped remarkably well in snow on their ordinary tyres, I think largely helped because the relatively narrow tyres cut through the snow instead of sitting on top and turning it into packed ice. One memorable journey in the 127 was 160 miles on the M1 without once exceeding 20 mph - it took about 8 hours as you might imagine plus some rest stops at service stations. Only 1 lane had been cleared by the ploughs. I think it also helped that with more frequent snow then I learned how to anticipate and do everything gently and slowly, plus some experimenting on snow-covered empty car parks. All the first three generations of Prius that I drove in snow coped quite well, the smooth application of power helping to get moving and B mode helping to increase engine braking for better control (worrying about the last mpg or two went out the window in those conditions). This is the 4th winter I've used winter tyres, so I've no experience on the Gen 4 using summer tyres on snow. I suspect the Gen 3s and 4s on the wider 17" tyres will have a harder time than those on 15" whatever type of tyre. I would still prefer to have 4WD and winter tyres if there was a suitable vehicle available that appealed to me and met my other criteria - and wasn't outrageously expensive. But, now I've got the Gen 4, I'm unlikely to change it for some time unless something really remarkable comes along - like a Prius plug-in with 4WD and a spare wheel and a rear wiper and electric memory front seats and decent boot and 5 seats - guess what? I'm not holding my breath.

Hi, No idea about the plastic stopper on the original, with Pattern parts they often do away with bits that are not actually used, even so OEM parts are not always truly identical as I found out when I fitted a new main radiator, had to do a bit of adjustment to the mounting brackets as the main part of the core was a larger - probable reason, the part is used in many other different vehicles. Yes, ours is the Climate control version or as the Toyota button says AUTO. Your first post / link to the part you say you ordered gives part no MRH0740 yet the link above in your last post above is MRH0915 , which says for the 1.8 TS,, so which one have you actually got ? Again do not have any idea of what kind of clamp /fitting is used on those Ends , but would assume even with a rubber seal it should feel properly firm as its bound to be affected by the heat / pressure. Think you are better speaking to the supplier if in any doubt, after all they should know their products , better safe than sorry !

On that subject (and nearly back on track) I just came across this on YouTube - a comparison between 2WD on winter tyres and 4WD on summers - not sure how valid but I found it interesting:

The standard engine in the USA for the hatchback is a 2.0l petrol. No hybrid.

Leading isn't the word I'd use. Have you been in an Ioniq? Absolutely hateful thing. Didn't even bother taking it for a drive, the interior was so bad! I think Toyota is playing it safe, and probably rightly so. Most people are still fearful of anything that plugs in and the recent story about how many PHEVs never get plugged in at all highlights the level of general ignorance about this kind of car. I suspect it makes business sense for Toyota to hang back and let other 'braver' manufacturers push for greater acceptance, whilst seeing their vehicles suffer catastrophic depreciation and relatively poor sales. Whilst I share your frustration that this means I can't yet buy a plug-in Yaris, or a full EV Prius, both of which would be of personal interest, I can understand why Toyota don't currently make these options. As for 4WD, it's not really a good match for hybrids, given its negative impact on economy. I also fail to see its practical value on a car which isn't 'sporty' or designed for off-road use. I would suggest that tyres and ground clearance are all that matter in the snow. Although, in this country, the sad truth is that in winter it matters far more what the cars behind you and in front of you have fitted!