coolant lines - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• coolant lines by holoffs on 13 Jan, 2011 11:30
• I am installing a fuel heater in my 1985 1.6 turbo diesel Jetta. I plan on splicing into the oil cooler coolant lines and was wondering which one is supply and which one is return? The car is not running now and I have no coolant in the system. 
• #1 by R.O.R-2.0 on 13 Jan, 2011 11:32
• the line that comes off it and enters the middle nipple on the water pump is suction..
  
  does it really matter what way the coolant is flowing tho? as long as there is, in fact, flow?
• #2 by holoffs on 13 Jan, 2011 12:20
• Not really but oil cooler out coolant line would be hotter.
• #3 by R.O.R-2.0 on 13 Jan, 2011 12:22
• hottest line coming off the engine would be the supply to the heater core..
• #4 by holoffs on 13 Jan, 2011 12:37
• Is that the line that comes off the end of the cyl. head?
• #5 by R.O.R-2.0 on 14 Jan, 2011 09:54
• yes.