Re: Frigiking A/C HELP

Posted by HH56 On 2010/11/8 11:55:40

One of the less expensive early AMC factory units but basic hang ons are all about the same.

Differences usually is age and type of blower. Unless a single speed, the older motors with two wires use something with resistors like this or a simple rheostat. 53-4 Packards used the resistor block because of confined control box, 55-6 Packard used rheostat. Stude's with hang ons I have info for, rheostat. Cheap but effective -- downside is heat dissipation - fairly large & resistors have to be in the airflow or in the open.

Later aftermarket units with motors having 4 or 5 wires use same basic multiposition switch but no resistors and feed field coil differently. Less current & no hot resistor to worry about.