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2003 turbo GT fan relays

 
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  #1 (permalink)  
Old 02 Mar 2017, 06:11 am
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Join Date: Feb 2017
Posts: 2
Default 2003 turbo GT fan relays

Can anyone help locate the fan relays for my 2003 GT Turbo as
I am overheating when in traffic or stopped and dont hear the fans kick in anymore...thx in advance!!
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Old 02 Mar 2017, 02:03 pm
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Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,329
Default Re: 2003 turbo GT fan relays

Welcome to the forum.

The 2003 GT does not have any fan relays.

Turbo Radiator Fan

The radiator cooling fan is a variable speed electric motor driven fan. The radiator fan assembly includes an electric motor, fan blade, and a support shroud that is attached to the radiator. The radiator fan is serviced as an assembly (fan motor/fan/shroud).

The variable speed radiator fan is controlled by the Powertrain Control Module (PCM) by way of a Pulse Width Modulated (PWM) signal. The duty cycle ranges from 30% for low speed operation then ramps-up to 100% for high-speed operation. This fan control system provides infinitely variable fan speeds, allowing for improved fan noise, A/C performance, better engine cooling, and additional vehicle power.

To control radiator fan operation, the PCM looks at inputs from:

Engine coolant temperature
A/C pressure transducer
Ambient temperature
Vehicle speed
Transmission oil temperature (automatic transmission only)

From the 2003 shop manual for the 2.4 liter Turbo:
Harness connector viewed from open end with the locating-locking tab at the top.
Top right is pin #1
Top left is pin #2
Bottom right is pin #3
Bottom left is pin #4
#1- black 10 gauge wire- ground
#2- violet/red 10 gauge wire- battery positive (fusible link)
#3- dark green/orange 16 gauge wire- auto-shutdown relay output
#4- dark blue/dark green 20 gauge wire- radiator fan motor control (part of PCM)

I would suggest checking the engine temperature sensor if the radiator fan is not getting any signal from the PCM on #4. Other members have had the engine temperature sensor fail causing the radiator fan not to work properly.
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Last edited by ptcruisersteve; 02 Mar 2017 at 02:20 pm.
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Old 02 Mar 2017, 04:10 pm
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Posts: 758
Default Re: 2003 turbo GT fan relays

Quote:
Originally Posted by mikepnnc View Post
Can anyone help locate the fan relays for my 2003 GT Turbo as
I am overheating when in traffic or stopped and dont hear the fans kick in anymore...thx in advance!!
you can use an automotive meter to backprobe the signal driving wires to the fan when your car is running and up to temperature, and jacked up in the air.

the fan connector is a four pin.
3 DG/OR and 1 BK are auto shutdown relay and ground, respectively.

if you have signal on wire #4 DB/DG but not operation of the fan, check for a path of current to the fan which is wire #2, VT/RD. It is connected straight from the battery and contains an internal fusible link, which could be open.

any other issue can be the PCM failing to send a driving signal, or a faulty fan module.
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Old 02 Mar 2017, 04:48 pm
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Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,329
Default Re: 2003 turbo GT fan relays

Quote:
Originally Posted by _PTGT03 View Post
you can use an automotive meter to backprobe the signal driving wires to the fan when your car is running and up to temperature, and jacked up in the air.

the fan connector is a four pin.
3 DG/OR and 1 BK are auto shutdown relay and ground, respectively.

if you have signal on wire #4 DB/DG but not operation of the fan, check for a path of current to the fan which is wire #2, VT/RD. It is connected straight from the battery and contains an internal fusible link, which could be open.

any other issue can be the PCM failing to send a driving signal, or a faulty fan module.
Before checking out the PCM make sure you check all the inputs to the PCM first listed below.

Engine coolant temperature
A/C pressure transducer
Ambient temperature
Vehicle speed
Transmission oil temperature (automatic transmission only)
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Old 02 Mar 2017, 05:47 pm
Fk5 Fk5 is offline
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Default Re: 2003 turbo GT fan relays

I post this monthly, but...

This happened while my Dad had the car and I was overseas. On the 2003 GT, the fan stopped working under warranty. Took it to the dealer and they checked it and replaced the PCM. Shortly out of warranty, the same symptoms arose. The dealer wanted to repeat the same process for a fee of near $1000, if my memory serves correct. Took it to a reputable local shop we like, the guy is basically the wheel alignment king of Brooklyn, and he agreed to do the job for considerably less.

While my Dad still grumbled about the price he left the car. Half a day after leaving the car Dad got a call from the shop. They were checking the wiring and noticed that some insulation was gone and the wire was screwed up. He said it looked like when the dealer probed the wire, they never retaped it or anything and it had deteriorated. He fixed the wiring and Dad was on his way.
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