What gives? - Page 2
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HT4100 4.1, 4.5, 4.9 Discussion, What gives? in Cadillac Engine Technical Discussion; Just as an update, my water pump went last week. Bought the car maybe 7 months ago with 56K, has ...
  1. #16
    pocketpared is offline Cadillac Owners Fanatic
    Automobile(s): 1992 Eldorado
    Join Date
    May 2009
    Posts
    200

    Re: What gives?

    Just as an update, my water pump went last week. Bought the car maybe 7 months ago with 56K, has 65K on it now. Friend had the wp replaced for his uncle just before I bought the car. Kind of early for it to go and it wasn't a Delco unit. It's a Delco now.
    To recap, car ran 178-218 mostly with occasional spurts to 220-224 and a rare max of 232-234 from the day I bought it. The high end would come when I was on the highway then run into a wall of traffic. Had the thermostat replaced with the water pump. It's a 198 degree. Temp info now reads from a low of 196 to a max of 207, local traffic (hilly). It would hit 212-214 under the same conditions before the work. Not enough time on it now but the temp is definitely staying in a much narrower band. The mechanic said the old thermostat looked like it was in there for a while. My guess is the thermostat is responsible for the change. Going to run it hard on the highway for a three hour trip next week with a high probability of stop and go traffic so I'll have a better grasp of the difference then.

  2. #17
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
    Automobile(s): 1985 Sedan DeVille
    Join Date
    Aug 2007
    Location
    Southern Maryland
    Posts
    1,487

    Re: What gives?

    the sensors are thermisistors that change resistance with temperature and will wear themselves out just like everything else. might be worth popping a new one they don't cost much

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