I have a battery warming blanket around the battery, an oil pan heater, and I tried to install a coolant heater recently to get even more warmth into the system. That last part was overkill surely. Unfortunately as I've found in other places my 98 with the strange AGR engine doesn't always have things in the same place. So the place where the instructions for the heater say to put the unit has a power steering line and the radiator fan housing (which appears to be larger than in later models). I know I'll be OK with just the oil pan heater so not a big deal.I will not be blocking the lower valance.
A good option to help the engine warm up faster in the winter is to hook up an oil pan heater or engine block heater (I think they even make ones for the battery and possibly even for the coolant??).
I haven't purchased one yet, I will wait to see how the TDI does this winter and if I'm having issues starting or it is taking a while for the engine to heat up then I'll get one.
I would be surprised that the Diesels would run 190-195F, but the only way to confirm is to get a group of Diesel owners to monitor and post their engine coolant temps. Here is where EVERYONE gets derailed, if you check the thermostat operating temperature, this is not the engine operation temperature.My TDI engine consistently runs between 190F and 195F (mostly at 190F), I monitor it with a ScanGuage. I rarely ever see it get up to 200F
A few months back, when it was still summer, the blue temp light would flash for a while and then switch to staying on, all the while the temp readings were at or around 190F. The TDI guru that looks after my car changed out the ECU sensor and I have had no blue light 'issues' since then.
Thank you so much jfol for such valuable information!I would be surprised that the Diesels would run 190-195F, but the only way to confirm is to get a group of Diesel owners to monitor and post their engine coolant temps. Here is where EVERYONE gets derailed, if you check the thermostat operating temperature, this is not the engine operation temperature.
It has to do where the engine coolant temperature sensor is located that determines how much higher than the thermostat operating temperature the the engine temperature will display. So for example, most engine temperature senors are located in the coolant path as it leave the cylinder head and heads back to the radiator. So on average, most cars and trucks will have a nominal displayed engine operating temperature of between 10-20F higher than the thermostat rate temperature.
So looking at the Stant application guide, it appears that the 1.9 Beetle Diesel thermostat is either a 190F or 195F thermostat. Given where the temperature sensor is located in the coolant path, I would expect the nominal/normal 1.9 Diesel temperature to be 200-205F, just like about 90%+ of most cars and trucks over the past 15+ years.
Very few exceptions to this rule of thumb and it mostly has to do with cars/trucks with the coolant sensor located directly on the thermostat housing and/or running a much cooler thermostat. I have a car that runs a 79C thermostat with the sensor mounted directly on top of the thermostat housing. In this car, the thermostat spring gets weak and drops just 5C and the engine runs crazy rich, performs very poorly and the fuel economy goes down the toilet. Give this VERY narrow window for a weak thermostat, I have to replace this thermostat no more than every 2 years.
Thermostat springs are JUNK and thermostat rarely last more than 3-4 years.
As for the coolant sensor causing the blue light to come on, this is the case, but again, I bet your car needs a thermostat based on the figures you are quoting.
Not sure the Diesel fuel economy will suffer as quick as the gasoline engine because the gasoline engines?Thank you so much jfol for such valuable information!
I will add a new thermostat to the repair list . My current fuel economy is good, averaging 47mph per tank and driving normally (not eco driving style).