1999 Ford Windstar Fans not working

KEVCAN

MEMBER
1999 FORD WINDSTAR
6 CYL
2WD
AUTOMATIC
115,000 MILES

Howdy,

Took my Windstar in to local mechanic because ac not working. He said fan not working and cost would be $500.00 to fix. I replaced fans myself today but they are not coming on. Connections are good. Fuse appears to be good. My understanding is that one fan is connected to AC via a pressure switch and the other is controlled by coolant temp. My questions are. Is that correct? And what else could cause both fans to not operate. Also it does overheat if run for about 10 minutes. What can I check?

Respectfully
Kevin

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

FAN CONTROL (FC) RELAY Contour, Crown Victoria, Grand Marquis, Mystique, Sable, Taurus, Town Car & Windstar The PCM determines engine cooling fan requirements and controls fan operation through Low Fan Control (LFC) and High Fan Control (HFC) circuits. HFC relay is normally open. Perform this test only when instructed by QUICK TEST or directed by other test procedures. This test is only intended to diagnose: � � � Wiring harness circuits (LFC, HFC, B+, FAN PWR and VPWR). See Fig. 7 - Fig. 10 . � � � Low Fan Control (LFC) relay and High Fan Control (HFC) relay. � � � Powertrain Control Module (PCM). Fig. 7: Identifying LFC/HFC Circuits (Continental, Sable & Taurus) Courtesy of FORD MOTOR CO. Fig. 8: Identifying LFC/HFC Circuits (Contour & Mystique) Courtesy of FORD MOTOR CO. Fig. 9: Identifying Cooling Fan Relay Circuits (Crown Victoria, Grand Marquis & Town Car) Courtesy of FORD MOTOR CO. Fig. 10: Identifying LFC/HFC Circuits (Windstar) Courtesy of FORD MOTOR CO. 1) DTC P1474 & P1479: Check For VPWR To Applicable Fan Control Relay DTC P1474 indicates a Low Speed Fan Control (LFC) primary circuit failure. DTC P1479 indicates a High Speed Fan Control (HFC) primary circuit failure. Possible causes are: � � � Open or shorted LFC or HFC circuit. � � � Open VPWR circuit to fan control relay. � � � Faulty fan control relay (LFC or HFC). � � � Faulty PCM. Turn ignition off. Disconnect appropriate fan control relay. Turn ignition on. Using a voltmeter, measure voltage between VPWR terminal at appropriate fan control relay connector and negative battery terminal. See Fig. 7 - Fig. 10 . If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open in VPWR circuit to appropriate fan control relay. 2) Check For LFC Or HFC Circuit Cycling Turn ignition on, engine off. Using scan tool, access OUTPUT TEST MODE. See OUTPUT NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedure to ensure all EEC-V systems are working properly and DTCs are no longer present. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Page 1 of 11 ELECTRIC COOLING FANS - EEC-V -1999 Ford Windstar 8/9/2008