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Heater stuck hot


John501

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Messages
59
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8
Location
Kansas
Vehicle Year
1990
Make / Model
Ford ranger
Engine Type
2.3 (4 Cylinder)
Transmission
Manual
2WD / 4WD
2WD
Tire Size
235/75r15
Hey guys, I have a 1990 ranger 2.3 5 speed. I switch my hvac slider to the cold side to let the truck heat up faster, then once it was warm I tried to move it back to the hot side. It wouldn't go past the middle, so in my infinity wisdom I forced it, and something popped. Now the slider has no Resistance, and the heat is stuck on. It's winter so that's fine for now, but how does the system work. Is it cables driven or vacuum operated, and how do I fix this? Any help is appreciated.
 


Rock Auto 5% Discount Code: 7FA902352B4C01: April 5th, 2021

RonD

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Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
It is cable operated up to 1994, electric 1995 and up
Fold down glove box and you will see the cable on the left at the top of the "air box"

Inside the air box is the Blend Door, it routes air from the fan around heater core(COLD) or thru heater core(HOT) or anywhere in between
The slider moves the blend door via a lever on the top of air box
Could be the slider arm broke or the lever?????
 

John501

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Joined
Jul 16, 2020
Messages
59
Reaction score
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Points
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Location
Kansas
Vehicle Year
1990
Make / Model
Ford ranger
Engine Type
2.3 (4 Cylinder)
Transmission
Manual
2WD / 4WD
2WD
Tire Size
235/75r15
It is cable operated up to 1994, electric 1995 and up
Fold down glove box and you will see the cable on the left at the top of the "air box"

Inside the air box is the Blend Door, it routes air from the fan around heater core(COLD) or thru heater core(HOT) or anywhere in between
The slider moves the blend door via a lever on the top of air box
Could be the slider arm broke or the lever?????
Alright I pulled the glove box off and everything looked fine there. So I pulled the Hvac control unit off and found the mount for the cold-hot slider cable snapped off. So I did the right thing and removed the ash box and pulled the cable end, and broken clip arm out of the hole. For now I can just push it in for cold and pull it out for heat. Thanks for the response RonD I really didn't know when they made the switch to electric.
 

RonD

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canada
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Good stuff (y)
 

Dirtman

Former Middleweight Moss Fighting Champion
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2009
Engine Type
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Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
It's January. Just ignore it for the next 3 months...
 
Joined
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Vehicle Year
90
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Ford Bronco II
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2WD / 4WD
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same thing happened to me, had to go the the junkyard and get a new cable. Went ahead and got a new hvac panel since the old one had the compressor on all the time.
 


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