No heat!
Thread Starter
|
Cross-Country
Joined: Dec 2020
Posts: 51
Likes: 1
No heat!
89 f250 460. Brand new thermostat that is functioning properly, tested with an ir thermometer at the water neck. Flushed system with new coolant. The air from the defrost vents, or any others for that matter never get really warm, best is a luke warm. What should I be looking at to fix this.
i ain't rite
Joined: Mar 2005
Posts: 65,450
Likes: 5,520
From: Marlboro Mental Hospital.
^^^^yup^^^^. common problem with these trucks.
coffee or soda cup on the dash and hit the brakes, the sticky liquid goes down the defrosted ducts and sits in the heater plenum. then dries sticking the blend doors where they are. if it was on ac when it dried, you will never get any heat.
remove the glove box and door, and feel along the top of the heater plenum while moving the heat/ac temp lever.
you will feel the cable trying to move the door. this will then allow you to dig in and hopefully free that door.
coffee or soda cup on the dash and hit the brakes, the sticky liquid goes down the defrosted ducts and sits in the heater plenum. then dries sticking the blend doors where they are. if it was on ac when it dried, you will never get any heat.
remove the glove box and door, and feel along the top of the heater plenum while moving the heat/ac temp lever.
you will feel the cable trying to move the door. this will then allow you to dig in and hopefully free that door.
Thread Starter
|
Cross-Country
Joined: Dec 2020
Posts: 51
Likes: 1
^^^^yup^^^^. common problem with these trucks.
coffee or soda cup on the dash and hit the brakes, the sticky liquid goes down the defrosted ducts and sits in the heater plenum. then dries sticking the blend doors where they are. if it was on ac when it dried, you will never get any heat.
remove the glove box and door, and feel along the top of the heater plenum while moving the heat/ac temp lever.
you will feel the cable trying to move the door. this will then allow you to dig in and hopefully free that door.
coffee or soda cup on the dash and hit the brakes, the sticky liquid goes down the defrosted ducts and sits in the heater plenum. then dries sticking the blend doors where they are. if it was on ac when it dried, you will never get any heat.
remove the glove box and door, and feel along the top of the heater plenum while moving the heat/ac temp lever.
you will feel the cable trying to move the door. this will then allow you to dig in and hopefully free that door.
Thread
Thread Starter
Forum
Replies
Last Post
sideburnie
Excursion - King of SUVs
36
Feb 1, 2019 09:24 AM
Iamnonstop
1987 - 1996 F150 & Larger F-Series Trucks
3
Mar 9, 2014 08:39 AM
