coachgeo
Well-known member
- 5,132
- 3,453
- 113
- Location
- North of Cincy OH
Not sure when coolant pump gets activated. (hi only, low not at al, or both but with a resister slowing it down in low setting? ) Would be interesting to find out. As noted above though... at least on the 939J24.... HI is NOT locked out at start up. Apparently it starts in high....The HI/LO ranges are applicable to the coolant heaters and a circulation pump can be installed to run in the "HI" mode.
As in all the heaters, the "HI" is locked out during the start-up phase.
Last edited: