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Electric Cooling Fan Problems Part 6
It's not quite summer yet and I'm seeing cars come in with overheating problems. Here is how you can avoid coming into my shop with this problem. |
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You have to check it with an ohmmeter. The thermistor has lower resistance at higher temperatures and higher resistance at lower temperatures. If the CTS has a resistance of 1500 ohms with the engine at normal operating temperature, the CTS is out of calibration and needs to be replaced. Service manuals will have a chart as to what the resistance should be at different temperatures.
For example, from the 1995 Chevrolet Lumina V-6 3.4 liter DOHC service manual:
| 100°C (212°F) | 177 Ohms |
| 90°C (194°F) | 241 Ohms |
| 80°C (176°F) | 332 Ohms |
| 70°C (158°F) | 467 Ohms |
| 60°C (140°F) | 667 Ohms |
| 50°C (122°F) | 973 Ohms |
| 40°C (104°F) | 1,459 Ohms |
| 30°C (86°F) | 2,238 Ohms |
| 20°C (68°F) | 3,520 Ohms |
| 10°C (50°F) | 5,670 Ohms |
| 0°C (32°F) | 9,420 Ohms |
| -10°C (14°F) | 16,180 Ohms |
| -20°C (-4°F) | 28,680 Ohms |
| -30°C (-22°F) | 52,700 Ohms |
| -40°C (-40°F) | 100,700 Ohms |
| More... » Part 1 » Part 2 » Part 3 » Part 4 » Part 5 » Part 6 » Part 7 |
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