AndyBees
Top Post Dawg
- Joined
- May 27, 2003
- Location
- Southeast Kentucky
- TDI
- Silver 2003 Jetta TDI, Silver 2000 Jetta TDI (sold), '84 Vanagon with '02 ALH engine
Thermostat
Back last February, I took a friend up to Dayton, OH on a very cold day (in the low 20sF) to pick up a Vanagon he had purchased. On the way back, with me following him, he drove about 60-62 MPH. My TDI temp guage stayed below the 190 mark most of the 255 mile return trip. And, it was obvious that the engine was not putting out a lot of heat....... we kept the heater temp set to the max with the fan on the second speed setting. At the time, I just assumed the low temp issue was because we were driving slow in the cold temps. On the way up, under the same conditions, with speed at or slightly above 70 mph, there was plenty of heat and the temp guage stayed stright up (190 reading).
Maybe I need to change my Thermostat........ would be good to know if the it will be open or not (assuming it is bad).
Assuming the theory is correct that the thermostat "fails open," then upon removal would it still be open?craig01b said:Sticky thermostat....mine did the same thing for 3 years in the colder temps. They fail open, and idling will cool the engine. No panic, and if your driving is mostly highway, its not really a worry. Its a curious thing the first time it happens, it makes up appreciate the efficiency of the diesel at idle.
Craig
Back last February, I took a friend up to Dayton, OH on a very cold day (in the low 20sF) to pick up a Vanagon he had purchased. On the way back, with me following him, he drove about 60-62 MPH. My TDI temp guage stayed below the 190 mark most of the 255 mile return trip. And, it was obvious that the engine was not putting out a lot of heat....... we kept the heater temp set to the max with the fan on the second speed setting. At the time, I just assumed the low temp issue was because we were driving slow in the cold temps. On the way up, under the same conditions, with speed at or slightly above 70 mph, there was plenty of heat and the temp guage stayed stright up (190 reading).
Maybe I need to change my Thermostat........ would be good to know if the it will be open or not (assuming it is bad).