Frequently Asked Questions

10 most frequently asked questions.

  1. 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?
  2. 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?
  3. How do I know which kind of oil my system has already?
  4. How do I know if I need to retrofit before recharging? (How do I know if I have an R12 system or R-134a?)
  5. How do I find the low-side port?
  6. If I put in refrigerant (top off), do I need to add oil too? If so, what type and how much?
  7. How much refrigerant should I put in?
  8. Do I need to vacuum out my system before charging?
  9. What does Xycleen System Cleaner do and how does it work?
  10. What's different about "High Mileage" refrigerant?

  • 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.

  • 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 ½ 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.

  • 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.

  • How do I know if I need to retrofit before recharging? (How do I know if I have an R12 system or R-134a?)

    If your car is a 1994 or earlier model, you probably have an R-12 system and need to retrofit before recharging with R-134a. Check under the hood for a label indicating whether the system is R-12 or R-134a.

  • 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:

    1. Find the compressor.

    2. Find large diameter metal tubing that leads from the compressor back to the fire wall.

    3. 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.

    4. Do not attempt to connect to the high side port as this can cause a can of refrigerant to explode.

    5. 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.

  • If I put in refrigerant (top off), do I need to add oil too? If so, what type and how much?

    Interdynamics' top off products contain the proper ratio of replacement oil.

  • How much refrigerant should I put in?

    We recommend using a pressure gauge for an accurate fill. Interdynamics' color-coded gauges will indicate whether you should continue filling (charging) or not. If you have just retrofitted from an R-12 system and had all the R-12 refrigerant removed, you should fill a system with R-134a at 80-85% of the original R-12 Volume. (Consult your owners manual or sticker under the hood for original R-12 volume).

  • Do I need to vacuum out my system before charging?

    If the pressure gauge indicates that the A/C system pressure is lower than 10psi, air has likely entered your system, so your system should be vacuumed out.

  • What does Xycleen System Cleaner do and how does it work?

    Xycleen removes sediment in the A/C system for smoother flow of refrigerant and oil and creates a cleaner, more efficient system (for better cooling). It continuously cleans, preventing the redeposit of previously removed sediment.

  • What's different about "High Mileage" refrigerant?

    Interdynamics' "High Mileage" refrigerant contains a proprietary formulation of lubricant enhancers that helps your old compressor run easier. This will make the compressor last longer and run quieter. It contains special anti-wear and lubricant additives to restore an older A/C systems performance.

Video Tutorials
Charge Port Locator

Find out how to recharge your air conditioning by choosing the make and model of your car.

NOT SUITABLE FOR
HYBRID VEHICLES