Thermostat not opening but not overheating?
My Car: 2005 A4 B7 19 TDI SE (115bhp)
Please understand that I have looked at every Thermostat thread available on the internet (Well that's how it feels)
I changed my Thermostat Tuesday evening after months of having my temp gauge never going past 70,
Took car out after and the gauge got to 90 and stayed there which is fantastic!
I am a very nervous guy when it comes to cooling (Having needed to change 2 thermostats in the past on a MK3 Ibiza Cupra after they malfunctioned)
I get in the car and drive to get the temp up to 90 and it nevers go's over 90 or drops anymore and my heating is working better than before (Obviously with it allowing the engine to heat up properly now!)
However i get out every time now and check coolant levels which are always fine and feel cooling pipes to ensure things are working.
Heres what i find:
Top coolant pipe (Nearest to touch when looking under bonnet = Very warm/hot
Reservoir and pipes coming from it = Warm/hot
Radiator = Warm/hot
Now my concern...
Pipe coming from Thermostat housing = Cold?
Now should i be concerned as if the car was overheating i would get a error right?
Is this just because my car isnt getting hot enough for thermo to open?
Do the diesels run a lot cooler and there for the thermo stays shut a lot longer?
Any advice would be GREATLY appreciated!