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I have 1998 chev suburban with rear air do they use two orifice tubes
Most orifice tubes are placed in the high pressure line to the evaporator at the fire wall connection. You will have to empty the freon from the system to replace the orifice tube which is not very expensive (the tube, that is).
The orifice tube is located in the line at the condenser discharge connection.
The ones I have worked on, you replace the line that goes from the condenser towards the firewall. The orifice tube is captured in the firewall end of the line, between the high side & low side valve fittings.
You could, but you will have to buy a new line to get a new orifice tube.
What orifice tube?
where does orfice tube go show diagram
On some suburbans its at the connection behind passenger turn signal.
Located in front of the radiator on the passenger side in the condensor line.
Many GM vehicles put the AC orifice tube right after the condenser coil. It would typically be near the bottom, almost connected to the condenser. My '99 Suburban AC orifice is located in the line that runs across the passenger side inner-fender. There is a union very close to the innermost edge of the battery tray. Break that union (after relieving pressure) and you will find it there.
Orifice tube on f150 with 4.2
It does not have an orifice tube.