Question about 2007 Chevrolet Uplander

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Chevy uplander fan remains on

Need to know what the problem is relay ? or a/c , ?

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  • 93 Answers

Could be stuck relay or bad motor controller switch.

Posted on Jan 15, 2013

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Posted on Jan 02, 2017

csmock132
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SOURCE: i need to know can i use a 1999 fan blower relay switch in a 2000

I,m sure you can, do they look the same?

Posted on Jun 05, 2009

  • 21 Answers

SOURCE: I need to install a radiator fan relay for a 2005

A simple way is to exmine the relays, if they are all the same,number and configuration, you can swap them around until the fan you are trying to enable runs, then discard and replace the last one you unpluged, or look at a schematic diagram usually in the owners manuel or available at the dealership for reference.

Posted on Jul 24, 2010

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How to replace coolig fan sending unit on a 2008 chevy uplander


Why ? Did you test ? Hook up a scan tool to see if the PCM/ECM - engine computer is reading coolant temp. ? Testing not guessing ? Do you even know how the system works .

The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.
During low speed operation, the ECM supplies the ground path for the low speed fan relay, which is Fan 1 Relay, through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from Fan 1 Fuse 29 through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the Series/Parallel relay, which is the Fan 2 Relay, and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. The ECM supplies a ground path for the high speed fan relay, which is the Fan 3 Relay, and the Series/Parallel through the high speed cooling fan relay control circuit. This energizes the Series/Parallel relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the Fan 3 Relay coil is energized, the relay contacts close to provide battery positive voltage from Fan 2 Fuse 33 on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 10 mph. This is to prevent a fan from cycling ON and OFF excessively at idle.

Feb 27, 2017 | 2008 Chevrolet Uplander

1 Answer

I have a 2005 uplander, the fans operate periodically when they should not. Have changed one senser.


How do you know when the fans should or should not work ? The PCM - engine control module tells the fans when to work . A coolant temp. sensor inputs coolant temp info to the PCM . Fans can come on when the vehicle isn't running , depending on temp. The cooling fans are turned on by the PCM using three relays . You best bet would be to take your vehicle to a qualified repair shop . Relay Driven Dual Cooling Fan Diagnostics

Dec 19, 2016 | 2005 Chevrolet Uplander

1 Answer

My chevrolet uplander radiator cooling motor fan only working, when the A/C is turn on. Any relay or fuse that I need to check?


It would be useful if you had mentioned whether it was a radiator cooling fan motor or a heater/ventilation fan.

It is usual for the cooling fan to switch on with the A/C is on unless the ambient temperature is quite low, otherwise it only operates subject to engine coolant temperature via a thermal switch fitted into the cooling system and/or the engine management system.

The heater fan is either directly switched and faults relatively simple to trace or subject to the whims of the climate control if fitted when a degree in magic is needed along with a box of tricks.

Aug 22, 2015 | 2006 Chevrolet Uplander

1 Answer

Rear blower not working on 2008 Chevy uplander


First think I would do is take an ohm meter and see if you are getting power to the rear blower resister. They go bad before the blower does. Also check your fuses and rear fan blower relay. Good luck.

Jan 07, 2015 | 2008 Chevrolet Uplander

1 Answer

Chevy Uplander a/c cuts out when hot and the cooling fan is always on


If the check engine light is not on, I would check voltage to the compressor clutch when it fails. Could be the clutch or a relay.

Aug 29, 2012 | 2008 Chevrolet Uplander

1 Answer

I own a 2007 chevy uplander v6 95k miles and the cooling fan comes on 20 seconds after car is running. I traced the fuse block to fan#3 by removing fan relay to know which fan is being told to run. it only...


Your vehicle has two fans controlled by three relay's . Both fans run together at two different speeds , low an high ! With the A/C on the fan's will run all the time while stopped at stop sign or idling . Any other time the then only come on when the coolant reaches a set temp. The ETC - engine coolant temp sensor is a input to the PCM - engine computer . When coolant temp reaches 212 degress the PCM energizes the fan 1 relay turning on both fans at low speed . This is very complex ,your best bet ,take it to a qualified repair shop.



Relay Driven Dual Cooling Fan Diagnostics

Aug 17, 2017 | 2007 Chevrolet Uplander LS Minivan

1 Answer

The heater fan does not turn on in the front of my 2006 chevy uplander the fuses are all fine and can hear the resistance when i turn the control knob


COULD BE FAULTY BLOWER MOTOR RELAY.CHECK TO SEE IF BLOWER MOTOR GETTING POWER USING A TEST LIGHT.WHEN YOU TURN ON BLOWER SWITCH POWER SHOULD BE AT PURPLE WIRE.IF YES BLOWER MOTOR FAULTY.IF NO YOU HAVE FAULTY HVAC CONTROL MODULE OR BLOWER MOTOR CONTROL SWITCH.

Jan 09, 2011 | 2007 Chevrolet Uplander LS Minivan

1 Answer

I need to install a radiator fan relay for a 2005 Chevy Uplander but I don't know where it goes..In FAN 1, FAN 2 or FAN 3


A simple way is to exmine the relays, if they are all the same,number and configuration, you can swap them around until the fan you are trying to enable runs, then discard and replace the last one you unpluged, or look at a schematic diagram usually in the owners manuel or available at the dealership for reference.

Jul 24, 2010 | 2005 Chevrolet Uplander

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