View Single Post
Old 02-23-2012, 09:15 AM   #18 (permalink)
DIY_GUY
EcoModding Lurker
 
Join Date: Feb 2012
Location: RI, USA
Posts: 12

DIY's Jetta TDi - '02 Volkswagen Jetta TDi GL
90 day: 43.95 mpg (US)
Thanks: 4
Thanked 1 Time in 1 Post
Coolant temp verified

Quote:
Originally Posted by COcyclist View Post
Thermostats get weak over time. I would swap yours if you don't hold 195 when warmed up. These diesels do better for mpg when up to full temperature. There is a guy on TDIClub experimenting with a 205 degree thermostat and he feels he has gained several mpg from that alone.
Yes I agree they do wear out. I've done a few lately on the 06 Cat C8s at work. I just wanted to verify that the sensor was not lying to the computer. I took an infrared gun and shot it yesterday when I got off the highway and yes it is accurately low I will have to look into the higher temp stat and I will modify one to fit if I need to so I get the 205° .Thanks for the input! When I do I'll post the results.
  Reply With Quote