Title: R134 Time: 30 minutes Difficulty: 2/10 Vehicle: all Author: Webmaster (Sadik)
2+ cans of R-134a $5 each
1 can (8z) of R-134a oil $3 each
1 can of sealant $4
RFC filler hose and can adapter $10 (kit)
Manifold gauges $100 (optional)
First, make sure that your system does use R-134 refrigerant. If you are not sure call dealer or take it to AC shop.
1. Locate Low Side (blue) and High Side (red) Service Port.
2. Remove dust caps from AC service ports, and clean ports.
3. Start engine and turn AC to maximum cool. (Do not do so in closed garage)
4. Turn can tap valve handle in counter clockwise direction until it stops. Screw can tap vale on threaded valve on top of R134a can. Tread blue house on can top valve.
5. Locate low site (blue) service port on AC system. Connect quick connect house fitting on low side. Pull sleeve back, place over a service port, push sleeve forward, make sure couple fits tightly.
CHARGE ONLY OVER LOW SIDE. Note: quick connect house fitting will only fit low side.
6. Shale can vigorously.
7. Turn valve handle in clockwise direction allowing piercing needle to puncture R134a can.
At this time your AC should start blowing cold air.
note: Because system is empty, charge system with first 2 cans in upside down position to activate the system. Then complete oil charge and after that add any additional R134a
It is going to take a while for all of refrigerant to get into a system. Let it sit for few minutes (2-5 minutes).
8. Once can has been emptied into AC system, close valve by turning valve handle in clockwise position until stopped. Remove quick connect fitting by pulling sleeve back.
9. Place probe-type thermometer in your air duct. If the temp stops dropping or starts increasing, you're fully charged. If not go back to step 5. Make sure that you add R134a oil after second can. Please look at the table on bottom of this page to see maximum capacity of you AC system.
10. If you AC is leaking R134a at this time you should add sealant, or any other additives.
11. If there is material remaining in can, keep closed valve in place.
12. Screw dust caps on service ports.
If using manifold gauges for step 9.
You'll begin to get steady pressures on the manifold gauges. The target pressures vary depending on ambient temps, but the range is 24-30 on the low side and 130-190 on the high side. The target pressures will be higher (definitely could be outside the aforementioned range) if it's hot out, lower if it's cool . To get the 38 degree outlet temps I got, I charged to 30 psi on the low side and 160 on the high side with 60 degree ambient temps. Keep adding refrigerant until the pressures come into range. Also keep an eye on the outlet temp via a probe-type thermometer. Use the "NORM" setting on the a/c, high fan and check the temp at the at the center air duct. If the temp stops dropping or starts increasing, you're fully charged.
Read and follow all instruction on back for each product.
Green=134a Blue=R-12 =Could Be Either 134a or R-12
YEAR MODEL CHARGE LEVEL
Maxima, 200SX, Sentra
Front AC Only
Front and Rear AC
Front AC Only
Front and Rear AC