Refrigerant R1234YF Color And Odor

Like water, refrigerants are colorless in both vapor and liquid form. Gas is invisible. Only the boundary layer between gas and liquid is visible. (Liquid level in charging cylinder tube or bubbles in sight glass). Refrigerant R1234yf fluid may appear colored (milky) in a sight glass. This cloudiness is caused by partially dissolved refrigerant oil and does not indicate a malfunction.
The refrigerant is almost odorless, if refrigerant R1234yf leaks, depending on the ambient conditions a light odor of ether can be detected.