Some guys do that?
I guess I'll need to find out the answer somewhere else by myself. Was hoping maybe he'd get a notification so he would come back to answer...
There's definitely no drop in temperature while driving at high speeds at -20C in regards to the coolant temperature.I'm guessing the thermostat is stuck partially open. When idling, there is no cold air blowing over the radiator cooling the coolant down to low temps, but when you drive and the thermostat is stuck open, the air is cooling everything down enough to make the heater air cold. Also the engine coolant temp displayed on the cluster gauge is more of an estimate.
what is coolant temperature at idle, are you having the same warm at stand still cold at speed situation? How long does it take to get your coolant to said temp from cold start?Because the solutions range from getting a new Heater Matrice/Exchange, changing the thermostat, blend door and heater control valve. Just wanted to make sure I apply the good fix. Especially after this comment :
There's definitely no drop in temperature while driving at high speeds at -20C in regards to the coolant temperature.
Idle it drops to around 87-90C. Speed is around 90-100 depending on how hard I press it. I don't know how long it takes. I'd say it's pretty fast (under 5 min). Will check next time. But even with coolan at 90C, I've had driver temps of 22C while passenger was 9C (obd11 live data). Here's a quick video of a 15 min drive.what is coolant temperature at idle, are you having the same warm at stand still cold at speed situation? How long does it take to get your coolant to said temp from cold start?
I've seen that this solved this particular issue (warm engine, no heat) for most of the people. While I do seem to have the same issue, I'd say there's also the fact that driver (left side) is hotter then passenger by like 20C. So it might be something else (low coolant, clogged heater, thermometer). I'm trying to find what exactly is the issue before spending money. Btw, how much cost the N82 valve?VW 15GTI,
I got a similar problem that kept me busy for quite some time until I found the culprit.
The problem was that it took really a lot of time to start having warm/hot ir on the vents on cold nights (below 10ºC). Sometimes it took almost 12 minutes for air warm up. Despite, real time monitoring of coolant temperature shown it was reaching nominal values pretty fast. If temperatures were milder (12ºC or above) I was getting hot air the cabin pretty fast. I also no problem if there was some residual heat on the engine compartment (like the car sitting for 2 or 3 hours)
After lots of troubleshooting with the dealer (they just could not figure it out), I found it myself: N82 valve, that controls the flow of hot water from the engine to the heather core got somehow stuck when temps were lower, so it was not opening!
After replacement , I got warm air in 2 min, no matter the outside temperature.
I hope it helps!
I can't cite the procedure but from what I've read it's very time consuming.I've never replaced a thermostat on a Golf so don't know what the idiosyncrasies are but on every other car I've had it's a $10 item, a couple screws and 10 minutes. If the car still has issues, at least you'd have a new thermostat and a spare in case that one goes out. Seems like a quick check to me.