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- HEATER - "MOAN" AT 1400-1800 RPM OR "HOOTING" NOISE HEARD AT 1200-2000 RPM ACCELERATION OR DECELERATION - VEHICLES WITH 4.6L ENGINE
- NOISE - "MOAN" AT 1400-1800 RPM OR "HOOTING" AT 1200-2000 RPM ACCELERATION OR DECELERATION - VEHICLES WITH 4.6L ENGINE
| Publication Date: JUNE 22, 1998 |
| 1997-1998 F-150, F-250 LD |
A heater "moan" at 1400-1800 rpm steady state, or "hooting" 1200-2000 rpm acceleration or deceleration may be heard on some vehicles. This may be due to water pump pulsations.
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