tdihopeful
Veteran Member
I think these are not really "newbie" questions but figured TDI 101 was still the place to ask. 1. Would optimal economy RPM perhaps be different on a higher milage engine? Meaning an engine that is at approximately 260,000 that probably hasn't had extensive tolerance work completed such as new rings and could have perhaps a small amount of blow by. That sort of thing. Seems that a higher milage engine may be more efficient at a slightly higher RPM and less load. This is speculation on my part and I really don't know if that would have any affect but was thinking.
2nd question, premised when I shut the engine down sometimes I note the radiator fan/s coming on immediately afterwards and if I notice this I restart the engine. I figured that the fans coming on is a sign that the engine temp needs to cool off more but didn't think that with the engine off that coolant would continue to circulate and therefore wouldn't have the intended purpose as I had imagined. This is kinda a newb question in that I hadn't committed to memory if the coolant pump was electric or mechanical. I maybe know that the pump is mechanical just hadn't confirmed in my mind yet. Also speculation as perhaps the radiator fans coming on are to prevent coolant boiling in the radiator or something. ?
2nd question, premised when I shut the engine down sometimes I note the radiator fan/s coming on immediately afterwards and if I notice this I restart the engine. I figured that the fans coming on is a sign that the engine temp needs to cool off more but didn't think that with the engine off that coolant would continue to circulate and therefore wouldn't have the intended purpose as I had imagined. This is kinda a newb question in that I hadn't committed to memory if the coolant pump was electric or mechanical. I maybe know that the pump is mechanical just hadn't confirmed in my mind yet. Also speculation as perhaps the radiator fans coming on are to prevent coolant boiling in the radiator or something. ?
