[77newell]

My 77 (not mine now) and the 93 both have boost pumps. On the 93 even though the boost pump appears to be hooked up to boost the flow already happening from the engine pump, when the engine speeds up from idle the air temp out of the dash vents drops. I have triple checked the flows and everything is according to hoyle, but it works terrible. There is full temp water coming into the heater core but little is experienced out the air vents.

When I asked the current owner of the 77 how the boost pump was configured, it is pushing backwards. I don't get how that heater can work better than my 93. I installed the pump in the 77, and I didn't know what I was doing. I guess ignorance really is bliss, or warmth as the case may be.