Preparation For Testing
- Attach Low and High side gauges.
- Start engine and allow it to warm up.
- Set system to COOL and blower to HIGH.
- Open car doors and hood.
- Run at fast idle for 2-3 minutes.
ALTITUDE PRESSURE VARIATIONS
| Altitude (Ft. Above Sea Level) |
Absolute Pressure of Atmosphere(psi) |
Gauge Altitude Correction (psi) |
| 0 |
14.7 |
0 |
| 1000 |
14.2 |
-0.5 |
| 2000 |
13.7 |
-1.0 |
| 3000 |
13.2 |
-1.5 |
| 4000 |
12.7 |
-2.0 |
| 5000 |
12.2 |
-2.5 |
| 6000 |
11.7 |
-3.0 |
| 7000 |
11.3 |
-3.4 |
| 8000 |
10.9 |
-3.8 |
| 9000 |
10.5 |
-4.2 |
| 10,000 |
10.1 |
-4.6 |
ALTITUDE VACUUM VARIATIONS
| Altitude (Ft. Above Sea Level) |
Complete Vacuum (In. Hg) |
Gauge Altitude Correction (In. Hg) |
| 0 |
29.92 |
0 |
| 1000 |
28.92 |
+1.0 |
| 2000 |
27.82 |
+2.1 |
| 3000 |
26.82 |
+3.1 |
| 4000 |
25.82 |
+4.1 |
| 5000 |
24.92 |
+5.0 |
| 6000 |
23.92 |
+6.0 |
| 7000 |
23.02 |
+6.9 |
| 8000 |
22.22 |
+7.7 |
| 9000 |
21.32 |
+8.6 |
| 10,000 |
20.52 |
+9.4 |