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1989 Ford F-150 heater core hoses

Tiny
MIKE1MONT
  • MEMBER
  • 1989 FORD F-150
Heater problem
1989 Ford F150 Four Wheel Drive Manual 185000 miles

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
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Sunday, December 9th, 2007 AT 5:45 AM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Disconnect both heater hoses from the heater core start it up and observe the hose that has pressure on it.
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Sunday, December 9th, 2007 AT 5:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 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.
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Friday, August 2nd, 2024 AT 10:52 AM

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