Cooling fan stays on?

There are 3 relays that control the various speeds. Apparently one of them is sticking on. 2 of them are in the power distribution box in the engine compartment. When they stick on I would try removing them one at a time and see if one of them shuts the fans off.

Just to add a little on this diagnoses I would see if you have any fan code's here is the trouble tree for fans staying wrenchtech is right though remove the relay's one at a time and see if the fan's stop to see if there is a faulty relay.I posted a diagram showing you where the three relay's are the second diagram that show's the front of a vue the relay is call out number 3. Here is the trouble tree let me know what you find.
Cooling Fan Always On (3.5L)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection Initial Inspection and Diagnostic Overview Diagnostic Starting Point - Vehicle
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The powertrain control module (PCM) commands the fans ON in high speed or low speed. In low speed, the fans are configured in series. In high speed, the fans are configured in parallel.

In low speed operation, the PCM applies ground to the coil side of the low speed relay. Voltage is applied directly to the left cooling fan through the switch side of the low speed relay. The right fan is connected in series to the left fan through the de-energized series/parallel relay so that both fans operate at low speed.

In high speed operation, the PCM applies a ground to the coil side of the low speed relay, the series/parallel relay, and the high speed relay. Voltage is applied directly to the right cooling fan through the switch side of the high speed relay. The left cooling fan obtains voltage through the low speed relay and ground through the series/parallel relay.

When the PCM is commanding a fan relay ON, the voltage of the control circuit should be low, near 0 volts. When the PCM is commanding a fan relay OFF, the voltage of the control circuit should be high, near battery voltage. If the PCM detects that the actual voltage of the relay control circuit is different than the expected voltage, DTC P0480 or P0481 will set and the affected PCM driver will be disabled.

Reference Information

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

* Cooling System Component Views
* Cooling System Connector End Views
* Powertrain Control Module Connector End Views

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

* Scan Tool Data List
* Scan Tool Data Definitions
* Scan Tool Output Controls

Circuit/System Verification

1. Verify that the following DTCs are not set: P0480, P0481.

O If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. See: Powertrain Management Computers and Control Systems Testing and Inspection Diagnostic Trouble Code Descriptions Diagnostic Trouble Code (DTC) List - Vehicle

2. Ignition ON, verify with a scan tool that the PCM is not commanding fan activation.
3. Ignition ON, observe that the fans are not activated.

Circuit/System Testing

1. Ignition OFF, disconnect the relays.
2. Ignition ON, observe that the fans are not activated.

O If the fans are not activated, replace the faulty relay.
O If a fan is activated, test the fan voltage supply circuits for a short to voltage.

Repair Instructions

* Cooling Fan and Shroud Replacement (L61) Cooling Fan and Shroud Replacement (L66) Cooling Fan and Shroud Replacement (LAT)
* Engine Cooling Fan Replacement (L66)
* Powertrain Control Module Replacement

Repair Verification

1. Ignition ON, verify with a scan tool that the PCM is not commanding fan activation.
2. Ignition ON, observe that the fan is not activated.

Have you tested the cooling fan relay(s)? Coolant level good? Is your coolant gauge showing normal or is it showing overheating?

Then let a shop put a scan tool on it to monitor the command from the bcm. If it is not being commanded off, it may be a bad bcm.

Roy

I cannot find any control module for the fan as it is contained in the computers.

Roy

Just to add to this one the body control module doesnt control the radiator fan on that vue. It only controls the low coolant sensor input to turn the light on the cluster when there is low coolant. The ecm controls the fan relay turn on. So you must have the early built 2002 vue with one fan relay?You really need to have the computer scanned for codes even though the check engine light is not on. If we get a code it code help really cut down the diagnoses time. If you have any codes please post the exact code numbers not code descriptions.

Yes, crank position sensor is the likely cause. You need to get that checked first as engine performance trouble codes takes precedence over others.

If the problem was not there prior to swapping the PCM, recheck the PCM wire connectors. It could be a bad PCM as well.

Just to add to this did you have any of this codes or problems before swapping the ecm?Also when it shuts off will it restart right away or do you have let it cool bfore it will restart?You can check the crankshaft sensor with a multimeter on those. Do you have a multimeter?Also those vues had issues with the throttle body asssemblies and the harness going to them.

The throttle relearn is you just turn the key to the run position position dont start and let it sit for about 1 min. That and the pass lock relearn are the only two I can think of. Did this used ecm come out of the same year etc vue?Also what if you put the old ecm back in does everything work normal again?Usually when those fans stay on its the fan relay sticking.