An ac expansion valve is the part in the ac cycle where the refridgerant goes from a smaller tube to a wider tube. Traveling through this valve causes the refridgerant to get cold similar to cracking the valve on a air tank. When the gasses go from a high pressure to a lower pressure they get cold ( PV = nrT ). The cold refridgerant then goes through an exchager where the blower blows air across to get the cold air you feel when you turn your ac system on.
how do I replace the AC expansion valve on a Mercedes C280 sedan. location and procedure
If 1993 suburban rear ac not cold how can check the expansion valve?
The expansion valve is usually in the evaporator and simply opens or closes to allow the appropriate flow of refrigerant into the coil. The theory is that the expansion valve makes your AC run more efficiently.
How do you change the ac expansion valve on a 2001 Honda civic
Expansion valve
Changes the refrigerant from liquid to vapor.
I anwered this question Look at post ... "Where is Expansion valve located on 2003 Yukon Denali XL"
Never worked on one, but guess expansion valve is mounted to evaporator under the dash in the AC/heater housing. Looks like a real bear to get out.
The ac system on a Ram doesn't use an expansion valve. It uses a fixed orifice system.
The expansion valve is located between the evaporator and the high and low pressure line connections. It is in the firewall behind the engine. Follow the hoses to the passenger compartment and they will terminate on the expansion valve.
The expansion valve on a 1997 Honda Accord AC is located in line with the tube that supplies liquid coolant to the air conditioner vapor. It is mounted right beside the tube.
Where id the AC expancion valve located in a 202 gmc yukon with rear air