2000 Mack Ch613 AC issues

[DieselTech18]

i have a 2000 Mack ch613 with ac issues ac is working but not blowing very cold air the system is charged it did fail a vacuum leak test but could not find a leak anywhere after letting it sit and run how can i test the thermostat and or water valve what other issues could it be the compressor is working and the condenser has no visibly bad damage 

[Joey Mack]

So you pulled the plastic duct on the right side of the doghouse and peak inside at the core for dirt clogging the evap core ?  It is a common issue.  

[DieselTech18]

1 hour ago, Joey Mack said:

So you pulled the plastic duct on the right side of the doghouse and peak inside at the core for dirt clogging the evap core ?  It is a common issue.  

i pulled the instrument panel cover which house the heater core and evaporator and the thermostat switch i replaced the switch and it is still not working does the 2000 ch have an external ac compressor clutch or is it internal 

[Joey Mack]

External..  likely a Sanden pump. Have you looked at the binary switch on the receiver dryer? They can get loose at the plug and cause issues, similar to Freightliners of that era. Turn the A/C on and gently wiggle that plug.. see if the pump kicks on. 

[Mark T]

Never hurts to change the filter. That little switch in by the controller knobs likes to give up too.

[DieselTech18]

2 hours ago, Joey Mack said:

External..  likely a Sanden pump. Have you looked at the binary switch on the receiver dryer? They can get loose at the plug and cause issues, similar to Freightliners of that era. Turn the A/C on and gently wiggle that plug.. see if the pump kicks on. 

ac pump is kicking on ac is on just not blowing cold air it’s more luke warm i was told that the compressor and clutch can affect it 

[Mark T]

Check the filter.

[Geoff Weeks]

IF the compressor is running and you suspect a refrigerant side of the system to be at fault, you MUST provide pressures and temperature reading for anyone to do more than guess. Also how sure are you of the amount of refrigerant is correct in the system?

[DieselTech18]

4 hours ago, Joey Mack said:

External..  likely a Sanden pump. Have you looked at the binary switch on the receiver dryer? They can get loose at the plug and cause issues, similar to Freightliners of that era. Turn the A/C on and gently wiggle that plug.. see if the pump kicks on. 

it is a sanden pump it’s turning on but i’m wondering if it’s not broken internally and causing issues.

[DieselTech18]

Just now, Geoff Weeks said:

IF the compressor is running and you suspect a refrigerant side of the system to be at fault, you MUST provide pressures and temperature reading for anyone to do more than guess. Also how sure are you of the amount of refrigerant is correct in the system?

100% it’s a 3 pound system with a 9.1oz of oil 

[Geoff Weeks]

3 minutes ago, DieselTech18 said:

100% it’s a 3 pound system with a 9.1oz of oil 

How do you know you have 3 lbs in there, did you put it in by weight? how doyou know it STILL has 3 lbs in there when itwill not hold a vacuum?