Cadillac CTS The mid-sized sedan that has grown the popularity of the Cadillac brand with it's low price and sleek styling

thermostat???

  #1  
Old 12-06-2008, 09:08 PM
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Default thermostat???

My check engine light came on about a month ago, and when I took it in to the dealer, the code said the coolant temperature was below normal.They reset it, but about a week later it came back on. I went back and they told me it was probably the thermostat and it would cost $550 to replace it. I bought the thermostat from them and spent about 4 hours with a shop manual in hand attempting to install it, but I got to the part where I had to disconnect the fuel line with a tool I did not have, so I had to just put everything back, without fixing it. I got the tool, but I'm not sure that’s the problem anymore and don’t want to spend 6 hours replacing something that doesn’t need to be replaced. My dad said it couldn’t be the thermostat because the car starts to heat up in about 3 minutes of driving, and is completely warm after about 5 minutes. Does anyone have any ideas? It’s an 03 CTS with 120,000 miles on it. Thanks!
 
  #2  
Old 12-07-2008, 07:56 AM
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Default RE: thermostat???

It would help if you posted code, I will guess P0128. PCM expects coolant temp to rise to operating temp in a certain length of time, if it doesn't code sets.Also installing lower than stock temp thermostat can turn turn light on.
 
  #3  
Old 12-07-2008, 12:40 PM
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Default RE: thermostat???

Thanks for your help slowroll, the code is P0128. I got the car with 115,00 miles on it, so the thermostat might have been replaced with one that is lower than stock... I dont know. I wonder though if maybe it might just be a bad sensor or somthing since the car warms up pretty quick.
 
  #4  
Old 12-07-2008, 02:55 PM
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Default RE: thermostat???

ECT sensor has its own codes. A skewed sensor is always possible, however you will be guessing with your money.
 
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