bad V-63 Thermostat

[metalman]

Hi Guy’s,
Working on an original set up for a V-63 compressor and I’m pretty sure the thermostat is out. Compressor fan will not shut off unless I adjust the settings manually (screwdriver adjustment type)

Box was not cooling and Evaporator was freezing up but I pulled to unit to clean and paint before doing a better diagnostic’s on the cooling system.
Rookie error for sure.

Questions 1) do I need to match T-stat with compressor type or is the two-plug for 9” capillary tube I seen on SJW (that looks exactly like it) OK?

Question 2) I suspect unit is under charged but found no leaks with a detector.  Any value to NOT breaking contained unit or should I install a Schrader value while it’s out of the box as a safe guard? (I have access to R12)

A little hesitant on my first machine I guess...
Any advice is appreciated

Thanks
Metalman

[johnieG]

In regards to your Thermostat replacement choice,  just make sure it has an operating range of (aprox) 29 to 45/55 fixed cut-in/ (degrees F) for the type that senses the actual "air" temperature,

NOTE: there is a type of T-stat that is intended to sense the actual tempurature of the metal evaporator housing, most notably on 60's Cavaliers & earlier Vendos, these can be identified by the ( afore-mentioned) fact that you will see the original clamped to the evaporator housing, or in the case of most earlier Cavaliers, inserted into a metal tube that is nested inside the fin area of the evaporator coils. ( and somtimes back-filled with some type of putty) the only reason I mention the direct-contact type is that it has an operating range 7-10 degrees BELOW the desired air temp ( or the "cut-out point) this is due to the fact of the thermal efficentency/heat transfer rate of the metal to the air flowing over the fins. & if you use a direct contact type from an old machine & try to use it to sense the AIR temp. well...you'll likely freeze the bottles or cans. as it wount cut-out (turn off the compressor) until it's down to aprox. 21 degrees/F

[metalman]

thank you JohnieG. Great Info!