Cooling Fan Tests? - 2003-04 Mach 1 Registry Owners Club

UK_Mach · 07-31-2014, 06:52 AM

Have finally traced some driveability issues to the fact that my cooling fan was completely dead.

Pulling it showed that one of the crimps on the main 3 pin connector had failed, so no fan operation on that circuit. While testing the repair I found that the resistor in the shroud had also failed open circuit. Fixed that with a spare I had. Tested the fan assembly on the bench so I know that both the low and high speed circuits are now good.

Is there any way of now testing that the whole system is now OK? I know that if I turn the ac on while stationary the fan runs, but is this low or high speed?

High or low, is there a way of forcing the "other speed" to switch on? Or am I overthinking this?

Kevin

DSG2003Mach1 · 07-31-2014, 07:38 AM

Ac forces high speed

Stock settings the low speed should come on around 208

07-31-2014, 06:52 AM	#1
UK_Mach Shakin' up the UK Join Date: Jun 2005 Location: Preston, England, UK Posts: 93	Cooling Fan Tests? Have finally traced some driveability issues to the fact that my cooling fan was completely dead. Pulling it showed that one of the crimps on the main 3 pin connector had failed, so no fan operation on that circuit. While testing the repair I found that the resistor in the shroud had also failed open circuit. Fixed that with a spare I had. Tested the fan assembly on the bench so I know that both the low and high speed circuits are now good. Is there any way of now testing that the whole system is now OK? I know that if I turn the ac on while stationary the fan runs, but is this low or high speed? High or low, is there a way of forcing the "other speed" to switch on? Or am I overthinking this? Kevin __________________ 2003 Zinc Yellow 5-spd IUP C&L 85mm MAF CAI, MRT catted H pipe + MRT Magnaflow Catback Steeda Aluminium UCA/LCAs SCT Tune by HPP Racing 305.3rwhp 318.9rwtq MRT Hood Strut kit, IAC Restrictor Plate MGW Shifter + Orange HandleCobra Tail Lights Just about all the MGW Trim extras! --------------------------------------------------

07-31-2014, 07:38 AM	#2
DSG2003Mach1 700 HP Mach Join Date: Nov 2003 Location: Orlando, FL Posts: 8,384	Re: Cooling Fan Tests? Ac forces high speed Stock settings the low speed should come on around 208 __________________ 03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater

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