4430 Sandin A/C conversion

Changed this over to a Sandin. Worked fine for a couple of days. Checked today and have high low pressure and low high pressure. Compressor is not engaging. Couldn't figure out the safety relay but had power from thermostat and solenoid but none to compressor. Need some help! Thanks![/b]
 
Well I did find out that my low pressure reading would be high if the compressor isn't coming on. Now to figure that out. Have power from cab and power from battery. Think my thermal protector is blown but not sure how to test or what caused it to blow. Thanks.
 
Most likely you have a leak,, the power will be sent to the compressor, but the low pressure switch at the compressor will not let the compressor come on..
 
(quoted from post at 07:31:32 04/17/19) Thanks Jim. Don't know how to see if low if compressor not running. Going to try and talk to some people to find out.

If refrigerant is low one will need to briefly "hot wire" compressor clutch with engine operating to check pressure while compressor is operating
 
Checked pressure ok with compressor not running. Haven't hot wired compressor yet, but ordered a new relay. Have voltage from cab but not through relay. Will post back.
 

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