1999 F 350, 7.3 Diesel, 2WD 6 speed

Say a Youtube video where a guy put in a vacuum actuated valve to stop the flow of hot water into the heater unit.

This is supposed to make the AC provide more cold air because the heater core won't be filled with hot coolant.

Any words of wisdom on this subject?
Thank you!
Regards,
Eric

 

Maybe can utter a few words, but don't know about the wisdom part !
The system was designed to provide dried heated air for the defrosters , so the A/C system was supposed to provide that via blend and directional doors in the ductwork.
Theoretically , the doors block the incoming/recirculated air from getting heated when not needed. You most likely could install either a manual or vacuum controlled heater shut off valve in the system, but when the coolant is circulating through the heater core , it is keeping sediment from building up in the core and hopefully preventing poor heater output problems. Not sure if the function control for the HVAC system has a provision for controlling any vacuum operated valve. I suppose a lot would depend on the temps where you reside. When the system is operating as designed there should not be a need for a coolant shut off valve, however, the choice is yours.

 

Thanks for the post. well said !!

 

Hanky,
Thank you and those ARE words of wisdom. I'm going to leave it alone!!
THankyou,
Regards
Eric

 

That's good to hear