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Found 2 results

  1. It is important to note that you will see wider fluctuations in engine temperatures with the AC off because the fans cycle on at 229 and off below 216 with the AC off. This will be true if the AC is disabled due to low refrigerant. With the AC on and operational, the fans are on low full time. The following details the cooling fan operation. The PCM will command fan operation when: Low Speed Fan Operation Engine coolant temperature exceeds approximately 106°C (229°F). Transmission fluid temperature exceeds 150°C (302°F). A/C operation is requested. After the vehicle is shut OFF if the coolant temperature at key-off is more than 151°C (304°F) and system voltage was more than 12 volts. The fans will stay ON for approximately 3 minutes. The fans will switch from low to OFF when the coolant drops below 102°C (216°F). High Speed Fan Operation Engine coolant temperature reaches 112°C(234°F). Transmission temperature is more than 151°C (304°F). When certain DTCs set. The fans will switch from high to low (except DTCs set) when the coolant drops below 106°C (229°F).
  2. Ok, so I'm looking for some advice, My 99' deville is running rather hot, my thermostat was in bad shape so I went and replaced it, but now it's running warmer than before, its never overheated but i regularly clean out the cooling system as i know the 97 to 99 northstar engine has shorter head bolts and dont want to warp head or anything, but it was staying a 203F or below and now it's running 208 to 212 at highway speeds. I know that's not super hot as the fans won't kick on until 224F but at highway speeds it should run around the high 190's I thought. I'm out of ideas and worried that if will end up overheating in these summer temps. Any thoughts? Thanks.