The way that the circuit is plumbed into the system, without the aux pump, it won't get any appreciable flow to the cores.
Originally Posted by the imitator
But being that most cars never used Aux pumps to begin with and have no problem heating up the cabin, this all has me thinking.
Remove the cover that sits over the control valve/aux pump assembly, then with the vehicle running and warmed up, touch the individual hoses to see what's hot or not.
My car had chunks of head gasket jammed in the impeller. The nice thing is that the aux pump impeller housing is serviceable. You can take the entire thing apart and clean it out. Same with the control valves. Time consuming, but entirely worth it if they're plugged.
Good food, good people, good times.
Last edited by Radian; 12-28-2012 at 05:35 PM.