94 sls overheating,maybe...

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Northstar Engines and System Technical Discussion Discussion, 94 sls overheating,maybe... in Cadillac Engine Discussion; I own a 94 sls that up until about 2months ago was great..The engine overheated (or so I thought ) ...
  1. #1
    dslide is offline Cadillac Owners Member
    Join Date
    Oct 2005

    94 sls overheating,maybe...

    I own a 94 sls that up until about 2months ago was great..The engine overheated (or so I thought ) ,replaced the thermostat,flushed twice ,replaced temp. sensor(thanks for the location info) with no luck.I finally looked into the codes and noticed that po14 -shorted coolant temp sensor and po73 -intermittent coolant sensor signal were both in the history .I then ran a test and both of them came up .are they both pointing to the temp sensor ? where do I begin?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: 94 sls overheating,maybe...

    I seem to recall our old friend "Rob" saying that there was a coolant temp sensor and a metal temp sensor in one of the heads ........I think.

  4. #3
    dslide is offline Cadillac Owners Member
    Join Date
    Oct 2005
    Thread Starter

    Re: 94 sls overheating,maybe...

    could you possibly give me any more info on the po14 and po73 codes that were displayed

  5. #4
    eldorado1 is offline Cadillac Owners Connoisseur
    Join Date
    Feb 2004

    Re: 94 sls overheating,maybe...

    Yeah, it means change your coolant temp sensor, and check the wiring.

    It's seeing it shorted and an intermittant signal.

    oops, you already changed it. Well still check the wiring for shorts.

  6. #5
    Eldyfig's Avatar
    Eldyfig is offline Cadillac Owners Connoisseur
    Automobile(s): 13 Challenger RT, 11 CTS Coupe Premium, 94 Eldorado (RIP)
    Join Date
    Jan 2003
    Folkston, GA

    Re: 94 sls overheating,maybe...

    P014 - As sensor temp increases, resistance decreases. A high coolant temp will result in low signal voltage. Code P014 sets because engine coolant temp can't be greater than 296 when intake air is less than 212. The failure condition is when the coolant sensor value is greater than or equal to 298 for 2 seconds.

    P073 - Sets when PCM detects a large change in sensor output voltage in a one-second period.

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