All Models
Disconnect plug and connect ohmmeter between terminals (Volkswagen) or between terminals and ground (all others). Measure resistance at various temperatures and compare readings to tables.
Temperature/Resistance Relationship (Jaguar, Toyota, Triumph & VW)
| Temperature (Coolant) | Resistance (Ohms) |
|---|---|
| -22° F(-30°C) | 20, 300-33, 000 |
| 14°F(-10° C) | 7, 600-10, 800 |
| 50° F(10° C) | 3, 250-4, 150 |
| 68° F(20°C) | 2, 250-2, 750 |
| 122° F (50° C) | 740-940 |
| 176° F(80° C) | 290-360 |
Temperature/Resistance Relationship (BMW, Fiat & Datsun)
| Temperature (Coolant) | Resistance (Ohms) |
|---|---|
| 14°F(-10°C) | 7, 000-11, 600 |
| 68°F (20°C) | 2, 100-2, 900 |
| 176°F (80°C) | 270-390 |