Polyol Ester (POE) based lubricants.
No
No r404a is not compatible with r409a, r134a and 404a use the same lubricates and are compatible but r409a use a different lub making them incompatible
There were some R134a units in 1992, but they were not the norm. Most likely, you have an R12 unit, which requires retrofitting in order to be compatible with R134a.
An R12 system must be retrofitted to be made compatible with R-134a.
no u can not mix the 2 togather it wil ruin the hvac system
No. NEVER mix refrigerants or use any refrigerant other than what the system is intended to use.
In order to remain compatible you should use the same type of freon that is in the system already. If the system has not been converted to R134a it would have R12 in it. R12 is much less used now and more expensive than R134a. You might want to consider having it converted to R134a If it has been converted to use R134a then use that freon.
It depends on the year of the car. From 1994 on, R134a refrigerant is used. Prior to that, they used R12 refrigerant (Freon). R134a is technically not "Freon". Be alert, however, as many older cars (like my 1986 Camry) have been retro-fitted with R134a systems, and can no longer accept Freon, as the two refrigerants are not compatible.
YOU WILL NEED TO FLUSH THE SYSTEM TO REMOVE THE OLD OIL. ALSO INSTALL A HIGH PRESSURE SWITCH AS REQUIRED BY THE EPA. THEN INSTALL CORRECT AMOUNT OF OIL COMPATIBLE WITH R134A. CHARGE TO ABOUT 80% OF R12 BY WEIGHT.
R134a is a refrigerant gas
Can you mix r134a with r410a?
No, unless the a/c has been converted to r134a