msfixit Posted June 20, 2004 Report Share Posted June 20, 2004 Trying to troubleshoot my A/C problems - pulled out my helm manual and after much looking found some information on troubleshooting the A/C - from what I read, it looks like both cooling fans, high speed and low speed should come on as soon as the A/C is turned on. My low speed fan does come on as soon as the A/C is turned on but the high speed fan doesn't engage until the engine reaches 210 - can anyone tell me if this sounds right? Link to comment Share on other sites More sharing options...
JasonA Posted June 20, 2004 Report Share Posted June 20, 2004 This information is from my '97 service manual for a Seville/Deville/Eldorado, which may vary from your Aurora. But here is the information anyway, hopefully it's useful for you. Both fans operate together, always at the same speed. The PCM commands LOW SPEED operation under the following conditions: - Engine coolant temperature exceeds approximately 229*F. - Transmission fluid temperature exceeds 302*F. - A/C operation is requested. - After vehicle is shut off, if the coolant temperature at key-off is more than 304*F, and system voltage is greater than 12 volts, the fans will stay ON for 3 minutes. The fans will switch to OFF when the coolant drops below 216*F. HIGH SPEED operation: - Engine coolant temperature reaches 234*F. - Transmission temperature is more than 304*F. The fans will switch from HIGH to LOW when the coolant drops to 229*F. Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
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