Front ram air heat exchanger control cable

[raykenyon]

1st ever post--1974 P337 serial No. 166---The front ram air heat exchanger control cable is completely missing--I can buy the control cable--but I can find nothing on the cable routing--where through the front bulkhead or how it routes through the engine compartment--looked in both the service and parts manuals--nothing--Suspect the cable was removed/broken in Florida by previous owner--no need for any turbo heat--Plane is now in upstate NY--need some heat in the Fall-Winter and Early Spring--Maybe a foolish thing I have overlooked--but I ask for help from the combined wisdom--thanks---Ray

[hharney]

Is that the ram air that supplies the Janitrol gas heater? Is that the cable you are missing?

[raykenyon]

Hello Herb--

I have a new replacement cable---the old cable is completely removed--yes, the cable controls the ram air valve in front of heat exchanger that passes turbo air into the janitrol unit.

It is the "routing" of the cable from the heat control levers at the bottom of the copilot instrument panel--through the front bulkhead and through the engine compartment to the ram air "butterfly" valve---that I can find no info on.

I am confident Cessna had a specific (safe) way they installed this cable and I want to put the new cable in correctly.

Thanks for your reply.----Ray

[Red Air Rambo]

Mine is down for annual so I'll go look tomorrow and see if I can help you out.

--Brent

[raykenyon]

Much appreciated--Ray

[Red Air Rambo]

Ok, if we are talking about the cable on the valve off the Janitrol Heat Exchanger, it runs down 1st attaching to an arm off the exchanger, then back to the battery, then up to a point on the firewall midway between the vacuum pump and inner (lower) starter contactor (should look like a quarter with a hole in the middle). Then thru the bottom of the avionics bay and into cabin behind the center console then parallels the defrost cable to the lever. FYI, mine is a 73.


--Brent