Heater control valve location
#1
Heater control valve location
89 f250 5.8 heavy duty 4x4
Where is the heater control valve i think it is stuck open because when tune the temp to cool it still blows hot air not cool air from outside. seems as if the heater is always on.
I know my A/C dose not work but still should blow cool air out from the vent position right?
Thanks in advance!!!
Where is the heater control valve i think it is stuck open because when tune the temp to cool it still blows hot air not cool air from outside. seems as if the heater is always on.
I know my A/C dose not work but still should blow cool air out from the vent position right?
Thanks in advance!!!
#2
If your application uses a control valve, I'm not 100% sure if the 89 does, it will be in one of the heater hoses between the engine and firewall where the heater hoses go inside the truck..
I know the later trucks don't use a water control valve, they use a "blend door" to route the air through or around the heater core.
I know the later trucks don't use a water control valve, they use a "blend door" to route the air through or around the heater core.
#4
#5
I thought the temperature control was operated by cable and only the fresh air door and vent selector were vacuum operated.
My '87 uses a cable for both the temperature control and vent position selector, but uses vacuum to control the fresh air door - I know that changed, but I'm not sure in what year.
My '87 uses a cable for both the temperature control and vent position selector, but uses vacuum to control the fresh air door - I know that changed, but I'm not sure in what year.
#6
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'89 and '90 trucks should be the same though we know how that goes.
I know there is at least one vacuum actuated device in the heating system on these trucks but I couldn't tell you with 100% certainty what it is now, but in any case I bet the OP's problem is with either the vacuum or cable operated components inside the heater box... or with the controls themselves.
I know there is at least one vacuum actuated device in the heating system on these trucks but I couldn't tell you with 100% certainty what it is now, but in any case I bet the OP's problem is with either the vacuum or cable operated components inside the heater box... or with the controls themselves.
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