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Overheating issue

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  #1 (permalink)  
Old 02 Mar 2017, 05:54 pm
Fresh Cruiser
Join Date: Feb 2017
Posts: 2
Default Overheating issue

Can someone advise where the fan relays are as the fans are not
Kicking in And car gets hot in traffic???
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  #2 (permalink)  
Old 02 Mar 2017, 06:00 pm
Fk5 Fk5 is offline
Senior Cruiser
Join Date: Jul 2011
Location: Colesville, MD
Posts: 1,883
Default Re: Overheating issue

No need for a 2nd thread. That is bad form. It was answered in the very first response. Go back there and read the responses. Your fix may be simple, but it won't be popping in a new relay. If you had a different model you would have to tell about the year because they were in different places. Some on the shroud.

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.
2003 GT 5 speed
162,000 miles
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  #3 (permalink)  
Old 02 Mar 2017, 06:00 pm
rckstein's Avatar
Join Date: Dec 2010
Location: Texas
Posts: 15,518
Default Re: Overheating issue

Welcome to the forum

Wasn't your question answered in your other thread?
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