You really are a MORON

 

The Toyota hybrids use a special kind of compressor. It is important not to add refrigerant with oils or stop leak. I tested the pressure and found my 2006 Highlander Hybrid was getting a bit low so I bought plain refrigerant 134a. I then added a can of it. The A/C got cooler and then stopped working. I was afraid I had broken the A/C somehow. But after driving the car a mile, the A/C came back and seems to work well now.

On reflection, if I add pure 134a with no oils, there is nothing in theory that can ruin the system.

What I used was: Johnsen's R-134a A/C Refrigerant -

You also need a refill kit and an A/C pressure gauge.

I'm sure the dealer would love to have you depend on them to do the servicing. If you have a serious leak, that might be a good idea. But for an 8 year old car getting a little low, the oil has not leaked out so adding plain 134a should be okay.

 

My 2008 prius last summer got hot right after I moved to Florida. Baught R134 a put it in. Its been a yr no issues. Just don't buy it with the oil. I went to school for hvac, pure refridgerant should not affect your system.every system will leak some over time and that will just be the Freon.

 

ZOMBIE THREAD ARISE!!!!!

There is no "should" about it. Straight R134a with NO dye, oil or sealant AND using uncontaminated filling equipment (low side hose or manifold gauges) will NOT increase the risk of failure.

85-95°F ambient
Run A/C full blast on fresh air setting for 5 minutes
R-134a to low side until bubbles disappear in sight glass (by the high side connection)
You should add 50-100g more refrigerant to get it truly full, but once the bubbles disappear in the sight glass, the A/C will perform well.

All 3 of my Priuses (03, 07, 08) have needed refiling with about 8 oz of R134a. The 07 needs it annually. Works great here in AZ summers.

Steve