1989 Ford F150 heater core hoses

1989 FORD F-150
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MIKE1MONT
  • MEMBER
  • 2 POSTS
Heater problem
1989 Ford F150 Four Wheel Drive Manual 185000 miles
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Hi
I want to install a tank heater on my f150, it has a 300 straight six cylindar for a engine. I need to know which heater hose is the return hose in it.
Thank You
Dec 8, 2007 at 9:45 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Disconnect both heater hoses from the heater core start it up and observe the hose that has pressure on it.
Dec 8, 2007 at 9:50 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,676 POSTS
Yep, that is the best way to see which way the coolant will flow, but I can tell you the hose closest to the water pump is usually the output.
Aug 2, 2024 at 3:52 AM
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