Join Date: Sep 2013
Location: West Des Moines, IA
Re: AC insulation wrap- necessary? see pic
What you have is probably sufficient. The sensing bulb just needs to be well insulated. Most of the "old school insulation wrappings" had two layers (due to the overlapping of material).
You could feel for the sensing bulb (through your insulation) and remove your excess back to about an inch after the bulb. Don't allow any part of the bulb or it's attachment brackets to be exposed to the heated engine bay area. Again - the bulb must sense the tube temperature just as it leaves the evaporator- and not part of the engine compartment temp.
'67 RS, convertible, factory A/C, 327/275 (M30), powerglide, parchment interior