Rear Air not working

[Expeditionchuck]

I need your advice.
I have an 03 Expedition with aux rear AC. I recharged the system after the front AC quit working and it fixed that problem. The rear AC still blows out hot air. My question is: is there a different low side service valve for the back or did I not use enough R-134? I used the dye also. No leaks noted. All blowers work, no clicking from the back. Thanks for your current and past help.

 

[aircargoo]

u have to charge rear ac as well...its a seperate system...i would just keep it off.

im glad i dont have rear ac/.....rear air ride....ect. theres some add-ons on expy that just dont last in the long run....

 

[ELVATO]

From what it looks like, it's all in the same. Do this procedure:

1. Drive the vehicle or run the engine until it reaches normal operating temperature.

2. Connect a manifold gauge set or refrigerant service center with high-pressure and low-pressure gauges to the refrigerant system.

3. Set the climate controls.
-If equipped with manual climate control, set the A/C controls for normal A/C-PANEL mode, full COOL temperature, FRESH air, HI Blower. If the vehicle has a fresh air/recirc button, set it to FRESH. If the vehicle has an A/C switch or compressor on switch, set it to A/C ON.
-If equipped with EATC/DATC, set temperature to 60° F (15° C) (lowest possible temp setting) with the dual function disabled (if equipped). Manually set blower on high. If the vehicle has a fresh air/recirc button, set it to FRESH. If the vehicle has an A/C switch or compressor on switch, set it to A/C ON.
-If the vehicle is equipped with auxiliary climate control, set the auxiliary controls to full COOL in the PANEL mode at HI blower speed.

4. Open all vehicle windows and leave the hood open for the test. Open the rear hatch and/or rear doors (if equipped).

5. Confirm the compressor clutch is engaged and the engine cooling fan(s) are operating or engaged. Allow the vehicle to idle until the suction (low-side) and discharge (high-side) pressures are stable or fluctuate in a range that repeats.

6. Record the ambient (shop) temperature.

7. Record the discharge pressure. If the pressure is fluctuating, record the average value.

8. Determine if the discharge (high side) pressure falls within the normal operating limits using the Normal Refrigerant Discharge Pressures chart.


9. Record the suction (low side) pressure. If the pressure is fluctuating, record the average value.

10. Determine if the suction pressure falls between normal operating limits using the Normal Refrigerant Suction Pressures chart.


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In this case, if you have one of those refill kits, you will only be able to record the low side pressure. Even though it won't fit if you try, don't try to take a measurement from the high side, since the pressure there might rupture the can.

Either way, take the measurement, and let me know what it was. Make sure you are also turning on the rear AC, as mentioned in step 3.

 

[aircargoo]

YIKES!!!

or u can do that...hehe

 

[KWT2000]

thats a nice chart!!! also check the blend door for hot/cold at the rear unit

 

[JUST4FUN]

the rear has its own orface tube/expantion valve check the tubes that go to the rear see if the smal tube is hot and the large tube is cool to the touch