Have you got VCDS if so you can see actual sender temps for both sensors I believe,So on my tdi, it seems the thermostat is not opening on my 15 mile motorway journey - the needle on temp cause does not move above 60, and on touch the top pipe is hot, and lower rad pipe is cool - I have replaced the thermostat but still got the same issue - any ideas?
I say it’s not opening as the bottom rad hose is cool to the touch but top is much hotter - almost scaldingActually your problem is the opposite of your title. The thermostat is never fully closed. Thermostat never opening would cause significant overheating to the engine and as the temp sensor is on the engine you would notice 110+ . Always open the fluid is circulating through the complete system and temp stays low. Other possibility is even though you say motorway if your speed is low the air cooling takes more heat out than the engine can generate to a point. Current ambient temps should rule that out though.
Sorry, don't know what sensor you need, but definitely think it would help if you can find someone local with VCDS who can give you a hand.I say it’s not opening as the bottom rad hose is cool to the touch but top is much hotter - almost scalding
Engine is amf - what sensor is it I need?
@Rogan linked to the temperature sender in post #4. As @steve_c noted, it's worth a scan to check temps though the temperature sender is a pretty quick cheap swap. It has two separate sensors within giving temp to Ecu and dash.I say it’s not opening as the bottom rad hose is cool to the touch but top is much hotter - almost scalding
Engine is amf - what sensor is it I need?