I replaced the monovalve and aux pump both with a ball valve and I haven't looked back. Plenty of heat if I want it. Given that the monovalve is basically impossible to fix to factory specs at this point, and the aux pump can burn your car to the ground or at the very least prevent the heater from working, it's hard for me to argue for keeping the stock system.

-Rog

Do you have a way to vary the heat as needed from inside the cabin?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Only with the fan. But around here it's either heater weather or it's not, so I've never felt put out by having to pop the hood to switch it. Beats what I had before, which was no heat.

-Rog

Thanks Rog! I'm gonna go ahead and try it then and see what happens.