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"Engine Hot AC OFF" on DIC. Temp gauge sweeps then stays at pointing to far left.

Bill S.

Seasoned Member
Joined
Jun 26, 2018
Messages
173
Location
Jensen Beach, FL
My XLR/V(s)
2006 V, Raven Black with Shale interior
Hi

Got the message "ENGINE HOT A/C OFF" message today after having driven the V for about ten miles. Tried turning it off and on a couple times. No change. The temp gauge needle at start up does the usual sweep, then parks at the stooped position, pointing to the left. Opened the hood. It was not unusually hot and the Radiator fluid was fine. No leaks. . Parked it for the day. Came back started it up and immediately got the same message. Just drove it home. Anyone familiar with the cause or fix for this ?

Bill
 

cubby558

Seasoned Member
Joined
Oct 17, 2008
Messages
2,755
Location
IL
My XLR/V(s)
'16 Z06, "06 XLR-V Infra Red-Sold, RII, RIII & RIV survivor, Mdwst Maurader
Bill,

There may be some posts on here, but if I remember correctly, the thermostat being replaced will most likely correct this. I never had this problem when I had my V, but I remember others having this and they replaced the thermostat and that fixed the problem.

Good luck.
 

xlrlist01

Seasoned Member
Joined
Oct 31, 2013
Messages
262
Location
HSV
Hi

Got the message "ENGINE HOT A/C OFF" message today after having driven the V for about ten miles. Tried turning it off and on a couple times. No change. The temp gauge needle at start up does the usual sweep, then parks at the stooped position, pointing to the left. Opened the hood. It was not unusually hot and the Radiator fluid was fine. No leaks. . Parked it for the day. Came back started it up and immediately got the same message. Just drove it home. Anyone familiar with the cause or fix for this ?

Bill
This has been discussed before, a long time ago. IIRC the message is mis-leading and there is an electrical problem, probably minor. From memory it goes something like this. The message says 'hot' because the ECM does not know what temperature the engine is, but does know there is a sensor fault. The message says 'hot' because Cadillac figured drivers would pay attention to that, more than a more accurate message which might have said 'engine temperature unknown'. Others have reported this message and the thermostat has been fine, the temperature sensor or sensor wiring has been defective. The X will behave as if it over-heating, even though it isn't, but the ECM does not know that.

HTHs.
 

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