It came with an R-12 system. To determine if it has been converted to an R-134a system look at the ports. If the threads are male then its an R-12 system and if the thread are female then its been converted to an R-134a system
The 2001 Ford Explorer A/C unit does not contain Freon (R12). Freon has not been used since 1995.
in the air conditioning unit
I believe is the 134A. Check in your engine compartment for any stickers... near or on the a/c unit.
How old is the tempstar.
the compressor is on the passenger's side of the motor under the van.
If your window unit is low on freon, the unit will not cool sufficiently or blast out warm air. To find out what kind of gas is used in this type of unit, look on the rear panel for a label which should specify what type is required.
On a 1989 Ford Aerostar : I believe the oil pressure sending unit for the oil pressure gauge on the 4.0 liter EFI , V6 engine is on the drivers side of the engine below the power steering pump
R-22
On a Ford Aerostar : I know on the 4.0 liter EFI engine ( which is an Over Head Valve / push rod design engine ) the sending unit for the oil pressure gauge is below the power steering pump on the drivers side of the engine
It came with R12 Freon. As R12 is cost prohibitive, have the unit converted to R134a refrigerant or a similar substitute.
On a 1996 Ford Aerostar , 4.0 liter V6 engine : The oil pressure sending unit for the oil pressure gauge is on the drivers side of the engine below the power steering pump
depends on freon type,quanity,hourly rate of hvac co.