160* Thermostat?
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Northstar Engines and System Technical Discussion Discussion, 160* Thermostat? in Cadillac Engine Technical Discussion; I put 160* thermostats in my other cars with great results. I've heard the N* is supposed to run hot. ...
  1. #1
    AlanSr is offline Cadillac Owners Member
    Automobile(s): 2001 Deville
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    160* Thermostat?

    I put 160* thermostats in my other cars with great results.
    I've heard the N* is supposed to run hot. Would a 160 help my wife's 2001 Deville?
    Or would the engine temps be too low?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 160* Thermostat?

    No. Use the stat that is spec'd. I believe it's a 190 or 200. Sub will probably know for sure. A 160 will run it way too cool.

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 160* Thermostat?

    Your OEM thermostat is set to begin opening at 188 and fully open at 206. The engine sensors are all calibrated to "assume" a running temperature of about 195-200 degrees. Your cooling fans run in slow whenever any A/C function is set, and if the A/C is turned OFF fans go to SLOW at 224 degrees and FAST at 236 degrees.

    A 160 degree thermostat forces the sensors to compensate for a "low temperature" engine fault which gives longer cat lightoff times, slightly richer fuel mixtures and cool oil (which is detrimental to efficiency and oil cleansing through evaporation of contaminants/acids).

    The Northstar does not run hot. It runs right in the design temperature band, and if we had better coolants, engines would benefit from running up in the 225-240 degree range due to higher efficiency.

    Click the pic to enlarge and see where the engine is running with the gauge at 12:00, its normal reading. In heavy traffic a Northstar FWD will easily go to 225 and back down as the fans cycle.

  5. #4
    AlanSr is offline Cadillac Owners Member
    Automobile(s): 2001 Deville
    Join Date
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    Re: 160* Thermostat?

    Thanks guys!
    I'm glad I asked first.

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