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2001 Ford F-150 King Ranch 4.6L Heater
Posted to Ford Engine on 4/4/2008 3 Replies

loud howling noise from heater box between 900 and 2000 rpm. changed core on suspicion of stoppage. noise gone initially until stat opens then noise is back changed stat and still the same.. heres what i know... noise is rpm related---noise only with stat open...

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Message Closed

car Vehicle Data

2001 Ford F-150 King Ranch

VIN 1FTRW07W01
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
AffectedHeater
ConditionsHowling Noise
Message Closed

car Vehicle Data

2001 Ford F-150 King Ranch

VIN 1FTRW07W01
Engine4.6 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
AffectedHeater
ConditionsHowling Noise