First of all with the front cover off. Get a test light and turn the unit on and select A/C mode. When the unit starts text the wire to the compressor clutch and see if it’s getting power.
Secondly when you had the leak I’m sure you lost some oil if not all oil with the Freon. My question is who repaired your lines after the leak? Did they check and add compressor oil? Because if they didn’t you may have a overheated bad compressor due to lack of oil.
A/C help on Thermoking
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Chris50, Mar 23, 2012.
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I had the exact same issues with one of my trucks. It turn out they didn’t put oil in the compressor after repairing the leak, the A/C worked for months the the compressor overheated and went bad, it was doing the exact same symptoms you described. There was power to the compressor clutch. The unit will run fine without A/C selected but as soon as you turn on A//C immediately after the condenser fan comes on it will shut off and ACS code displayed.
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AC5 sets for one of three reasons...
1. Low refrigerant. (Trips code instantly)
2. High side pressure too high. (Can take a minute to set this code... usually condenser fan inop)
3. Bad binary switch.
How much static pressure is in the system? Is the compressor locked up? -
High pressure side seems normal and switch is new. -
Before 9/2006 they used a binary switch. More than 325 psi on the high side or less than 22.5 psi static pressure would set an AC5 code.
After 9/2006 they went to a separate high pressure cutout switch which would set AC5 over 400 psi. The low pressure cutout would disengage the clutch at less than 5 psi but the unit will still run.
If you don’t have AC gauges or a pretty good understanding of how AC works, I would just take it back to TK (or a dedicated AC shop).Vasilebanc Thanks this. -
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