A/C General FAQs 1. How do I find the low-side port?
2. My A/C is not blowing cold. How can I tell if I need mechanical repair or just recharging? How can I tell if my compressor is working?
3. I'm getting a starting pressure reading of over 65psi but my A/C is not blowing cold – Does my system have too much refrigerant or too little? Should I recharge?
4. How do I know which kind of oil my system has already?
1. How do I find the low-side port?
The low-pressure port usually has a blue or black dust cap and is located on the larger diameter metal tubing that runs between the evaporator (in the dashboard) and the compressor. To locate the low-pressure port:
- Find the compressor.
- Find large diameter metal tubing that leads from the compressor back to the fire wall.
- Find port on this tube. Our quick-connect coupler should fit onto this port. To be sure, compare with the port on the other tube (smaller tube) that leads from the compressor to the condenser near the radiator. This port is larger and is the High Side port. Our quick-connect coupler will NOT fit on the High Side port.
- Do not attempt to connect to the high side port as this can cause a can of refrigerant to explode.
- Sometimes the low side port is on-or-near the compressor, sometimes it’s on an accumulator near the firewall…not on the large diameter metal tube.
Examples of Low-pressure (low-side) port locations
Buick LeSabre
Pontiac Bonneville
Olds 88/Regency
Toyota Camry
Ford Taurus
Honda
Saturn
Mitsubishi Galant
VW Passat
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2. My A/C is not blowing cold. How can I tell if I need mechanical repair or just recharging? How can I tell if my compressor is working?
If the compressor is engaging, the center of the compressor clutch will turn with the outer pulley. If the pulley does not turn and there is a loud squeal, this usually indicates a locked up compressor. The compressor and drier will need to be replaced.
What if the clutch is not engaging but the outer pulley is spinning freely? If the refrigerant charge is low, the low pressure cut out or the low pressure cycling switch can both prevent the clutch from engaging. Adding some refrigerant should alleviate the problem. Also, while initially putting in some refrigerant, try setting the air conditioner to DEFROST.
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3. I'm getting a starting pressure reading of over 65psi but my A/C is not blowing cold – Does my system have too much refrigerant or too little? Should I recharge?
If the compressor is not running, put ˝ can of refrigerant in to try and get the compressor to kick on. If it does not kick on, then you need mechanical repair.
If the compressor is running and the pressure reading is over 65psi, you either have too much refrigerant or need mechanical repair. Either way, you need professional help.
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4. How do I know which kind of oil my system has already?
Check the system specifications in your auto manual. Ester oil that Interdynamics uses is compatible with all refrigerant oils.
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