Engine fan not switching off

Two cooling fans controlled by three relay's . If only one fan is working ,that could be a problem .
Coolant Level Sensor Description
The coolant level sensor monitors the coolant level in the cooling system and indicates if the coolant is low. This sensor is located at the base of the radiator surge tank and is not serviceable.
CHECK COOLANT LEVEL (2)
The IPC receives a discrete input from the engine coolant level switch. The engine coolant level switch is normally closed. When the engine coolant is low, the engine coolant level switch opens. When the IPC receives an open signal from the engine coolant level switch, the IPC displays the message on the DIC.

Relay Driven Dual Cooling Fan Diagnostics There are using a pontiac , by your cadillac is the same .

check your vacuum actuated heater valve assembly under the hood for proper function .possible malfunctioning thermostat

It is almost always mounted in the radiator or next to the thermostat housing,do not mistake Cooling Fan Switch Operation:
The cooling fan switch on electric fans monitors coolant temperature signals from the engine control computer. When the engine is cool, the switch opens to keep the fan from spinning. When engine is warm, the switch closes to turn fan on for cooling. How To Instructions:
Inspect - Check for obvious problems.
Test - Give it an in-depth diagnosis.
Replace - Out with the old, in with the new.
the coolant temp sensor for the fan switch.

sounds like a bad connection somewhere check your ground from the engine and body, to the battery. check all connections to all sensors in the rad and the coolant bungs, get them squared away best as possible.

if that's not the remedy check coolant level if the fan switch is not submersed in coolant it will not turn on the fan. and the same goes with the temp sensor the level may be right at the sensor but below the fan switch. If the coolant is low top it up. check it again in a couple days.

if the coolant in low again check for white smoke out the tail pipe. depending on your technical skills you may at this point want to bring it to a garage for leak down test and compression test. Good luck!

Did you replace the fan? How about the fan switch?

Here is some stuff to read about this system....please let me know what's up!


This switch is the primary controller of the operation of the radiator fan(s) used for cooling. When the coolant in the system reaches a pre-determined temperature, the fan switch closes and completes a circuit. The fans will be brought on. Generally, the switch communicates with the fan relay, although the later PGM-FI cars send the signal through one of the many solid-state controllers first. Do not assume that the switch is the only component in the radiator fan circuit which controls its operation. There are many other components whose failure may prevent the radiator fan from operating. If the fans are not working when the engine is very warm, check the fuses first.
On all vehicles except 1990-95 Accords and 1992-95 Preludes, the fan switch is located in the bottom of the radiator. On 1990-95 Accords (except V-6) and 1992-95 Preludes, the switch is located in the housing at the rear end of the coolant connecting pipe. This is the pipe running along the outside of the engine, just above the oil filter. The switch the only electrical component in the housing. On the Accord V-6, it threaded into the side of the coolant crossover pipe (not next to the bleed bolt) on the transaxle side of the engine.

Coolant fans are turned on by a heat sensitive switch, your engine temperature may not be getting hot enough for it to come on.
One way to test it is let the vehicle idle and keep an eye on the temperature gauge, do not let it get into the red!!
The fan should start around half way or there about, if it does not start and you are nearing the red mark, shut the engine down and let it cool off.
There is only a few simple parts to check...
(1) Check the fan is free moving and has not locked up, you can also test the fan by unplugging it and hooking 12volts to it.
(2) Check the fan relay, see if there is another in the fuse box you can temporary swap with, it should be of the same type, if unsure do not try this.
(3) The sensor switch may be bad, if your engine temperature is up high enough, this switch should close.
You may even need to take it to a dealer and have them do a quick look at it, with a lot of highway use the fan will seldom come on, only when you sit in traffic will it operate or on a hot day.

check the plastic connectors in the cooling system.vw is notorious for the plastic stuff cracking causing a slow leak

P0A93 is an inverter cooling problem. The inverter is cooled by a dedicated cooling system, which consists of an electric water pump, cooling fan, and radiator. This cooling system is independent of the engine cooling system.The mechanic should check if there is sufficient amount of coolant for the inverter, check if the coolant hose is not bent or clogged, if the water pump / cooling fan motor connections are ok, and of course if both of the cooling fan motors are OK.

P3108 is generally loosing communication with the A/C system control module. This can usually be solved by checking the wires and or the converter inverter assembly.