Ok, I need to regular service my Sup in next few days..and I tought I could solve problem with her as Ive lost heating this winter.

Not long ago(before winter tough my mechanic did big general service). I bought high quality parts..and all went well. At least I tought so.

First thing I did was flush heating matrix and that went well. I got heating but not as hot and strong like it was. And that didnt last for long.

Today, I re read many topics with similar problems, and I tought I could test it and feel both hose are really hot. So it may seems like heater isnt clodged.

Also I saw somewhere owner of audi s4 had similar problem but I cant find it..if I remember correctly he said he had problems with termostat. And on this forum member rotodiesel said if hoses are hot that problem is with flap motor and dash need to come out.

I would like to make sure that it is really case and not to tear it appart and find it something else is problem.

I would like to POINT OUT that my Sup need longer time(than usually) to heat up and also temp needle goes back to zero and imidiatly goes back up. Does this have some kind of connection between no heat? Someone said it could be coolant temp sensor or something similar.

What would you do, and from where to start?

UPDATE! Changed coolant temp sensor(green one with facet green) and backflushed heater, now got same heat like I had.

I dont know will this fix be permanent, but I guess will see...cheers