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Cooling fan wont come on

Fan wont come on. car over heats. previous owner installed a by pass on switch. i have dealer codes P1258 and P1860

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Google the Codes
OBD P1258
OBD P1860
Include your vehicle
Dealer Codes?
What does that mean?
I wouldn't be at a dealer & codes
pertain to the vehicles strategy

Posted on Jul 22, 2013

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Posted on Jan 02, 2017

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My 2000 cadillac deville is over heating but not all the time its says turn ac off what should i do


Google those codes and have the engine checked for a leaking cylinder head gasket

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1 Answer

P1860


Well code 1860 is for a problem with the torque converter clutch. Code 1258 means the computer saw the overheat problem and put the engine in limp mode.
You need to know if the computer is grounding the fan relay when the fan is needed, and if the relay has power.

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I have a 1989 Chrysler New Yorker. The previous owner had a problem with the heat and a/c. They installed a switch that blows cold air. I don't need cold air, I need heat.


Code 88 shows to not really mean any problems. Most of those years of cars have a small valve to control water flow. Make sure your heater core is getting water, and the fan runs. If not, check fuses and the control switches for heat/cool. With that switch they installed, wires may have been cut or spliced.

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Cooling fan won't come on when car is up to temp. Fan came on when power wire to it was grounded out. The new thermostat is hooked in but does not work either. Wondering is the coolant temp sensor is bad...


Sounds like you should take it to a qualified repair shop to have this sorted out. new thermostat is hooked in but does not work either. ??????? The thermostat does not open ???? Engine over heats ? You put it in backwards . Cooling fan relay turns on the cooling fan . It's tough to guide someone through a diagnostic procedure when then don't have any idea how the system works .

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1 Answer

P1258 CODE


Trouble Code: P1258 (4.6L V8 VIN 9 Auto)
Engine Metal Over-Temperature Protection
Number of Trips to Set Code: 1
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
DTC P0117, P0118 and P0125 not set, Engine started; and the PCM detected the ECT sensor indicated more than 270ºF for 10 seconds. The PCM uses the ECT sensor to detect if the engine is running too hot (when the ECT sensor is over 268ºF). If the engine is overheated, DTC P1258 will set. The PCM will disable 2 groups of four cylinders by turning off the fuel injectors. By switching between the two groups of cylinders, the PCM is able to reduce the temperature of the coolant and lower the temperature.

Possible Causes:
  • Engine cooling system problem (test the cooling fan operation)
  • Engine coolant level is low or the mixture is not correct
  • ECT sensor is out-of-calibration or "skewed"

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