Hello,Around 3 weeks ago i was cruising at the higway and my coolant needle moved, i went to the workshop and they said i need a new pump and a radiator, i replaced both.
Now when i drive i check the coolant temps through an OBD app, but i can't tell if the problem has solved or not coolant always fluctuates between 95-105, shouldnt the water be stable around 97-98?
Is 100+ on water safe, should i go back to the workshop to check more stuff ( the needle hasn't move since) am i overthinking things.I have like 30 logs of normal driving through the OBD that i can show.
(Polo GTI 6R, 1.4TSI CAVE EA111)
COOLANT TEMPS UNDER OBD
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RUM4MO
- Bling Bling Diamond Member
- Posts: 6090
- Joined: Sat Dec 30, 2006 9:12 pm
- Drives: B8 S4 & 6R/6C1 1.2TSI 110
- Location: Mid Lothian
Re: COOLANT TEMPS UNDER OBD
I'm not sure that you should expect the coolant temperature to be controlled as well/tightly as 97>98C, the cooling system, as well as thermostats, has a 2 speed radiator cooling fan - or even 2 single speed cooling fans, so the coolant will end up rising before being controlled by the fan speed switching or fan switching in the case where there are 2 cooling fans, and then getting pulled back down and the fan speed switched or the second fan switched off - and so the process will continue - all normal way of working I'd think.
Edit:- this just shows that most of us don't actually try to find out what coolant temperatures to expect when our cars are being driven and everything is working okay.
I had a post cat Lambda probe issue/failure with my wife's 2015 VW Polo 1.2TSI 110PS, ie B1 S2 - electrically it didn't seem to be "broken" but it had probably reached the point in its life where it was failing to work as intended - so maybe I could have tried cleaning it - but I didn't, I just bought a new genuine VW Group B1 S2 (Bosch) Lambda probe, fitted it and the problem as in logged fault, disappeared.
Anyway, while I was using VCDS with the engine running, I started checking a few other field/channel values - Radiator Outlet Temperature Specified 98C, Radiator Outlet Temperature Actual -40C !!! This was during the summer period in Central Scotland, hummmm. I immediately ordered up a coolant temperature sensor and reported this issue on a Volkswagen Forum - the answer I got was "this engine in that car does not have a sensor that detects/monitors the radiator outlet coolant temperature - so ignore that reading" - so it looked like VW Group messed up and allowed a field/channel value to be viewed where it had no associated sensor input, so it was just reading its "window low limit" - not very clever or useful!
Edit:- this just shows that most of us don't actually try to find out what coolant temperatures to expect when our cars are being driven and everything is working okay.
I had a post cat Lambda probe issue/failure with my wife's 2015 VW Polo 1.2TSI 110PS, ie B1 S2 - electrically it didn't seem to be "broken" but it had probably reached the point in its life where it was failing to work as intended - so maybe I could have tried cleaning it - but I didn't, I just bought a new genuine VW Group B1 S2 (Bosch) Lambda probe, fitted it and the problem as in logged fault, disappeared.
Anyway, while I was using VCDS with the engine running, I started checking a few other field/channel values - Radiator Outlet Temperature Specified 98C, Radiator Outlet Temperature Actual -40C !!! This was during the summer period in Central Scotland, hummmm. I immediately ordered up a coolant temperature sensor and reported this issue on a Volkswagen Forum - the answer I got was "this engine in that car does not have a sensor that detects/monitors the radiator outlet coolant temperature - so ignore that reading" - so it looked like VW Group messed up and allowed a field/channel value to be viewed where it had no associated sensor input, so it was just reading its "window low limit" - not very clever or useful!