does ac cut off under load
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From: MILILANI HI
does ac cut off under load
hi,
i have a 03 ranger 3.0 and the ac shuts off when i step on the gas. when i take my foot off it comes back on. is this normal? i'm using the max ac setting. i had a car back in the 70's that was normal, but now 2003? i have 3 other cars now and none of them does this.
thanks,
rod
i have a 03 ranger 3.0 and the ac shuts off when i step on the gas. when i take my foot off it comes back on. is this normal? i'm using the max ac setting. i had a car back in the 70's that was normal, but now 2003? i have 3 other cars now and none of them does this.
thanks,
rod
Last edited by eszoom; Dec 2, 2019 at 02:16 AM. Reason: used wrong year
But ONLY at wide open throttle(WOT), foot all the way to the floor and hold it down all the way, and FAN would stay running, it would just blow "a bit' warmer when AC compressor is shut off but it would have to be for 20 seconds or so of WOT before it got warmer
I think you have a leak in the Vacuum system for cab vents, so AC is not shutting off its just blowing out Defrost vent instead of panel or floor vents when you accelerate
The vents in the cab use "vacuum motors", vacuum holds the vent doors in-place, Defrost setting has both doors closed, so no vacuum needed
In the engine bay is a Vacuum Reservoir, black plastic ball, usually located passenger side front down low in the engine bay
This ball stores vacuum for the cab vents
When you accelerate the vacuum in the intake manifold drops to 0 if there is no "reserve vacuum" then vents will switch to Defrost at that time, when you get up to speed the vacuum in the intake comes back up and you get panel vents working again
The most common place to lose cab vacuum is on the Black plastic vacuum line that runs from firewall to the black ball, it gets a crack or melts near exhaust manifold
Look on the passenger side on firewall and you will see TWO vacuum lines coming out, one is black and one is Grey
The grey one runs to the heater hose bypass valve, you can actually use that one and follow it back to firewall to find the black one
The black one is the one you want to check
Follow it and feel it with your fingers, you can fix any cracks or holes with tape or cut out a section and use rubber vacuum line to splice it
If the line is OK then most likely you have a cracked Black Plastic ball, so it can't hold vacuum in reserve
I think you have a leak in the Vacuum system for cab vents, so AC is not shutting off its just blowing out Defrost vent instead of panel or floor vents when you accelerate
The vents in the cab use "vacuum motors", vacuum holds the vent doors in-place, Defrost setting has both doors closed, so no vacuum needed
In the engine bay is a Vacuum Reservoir, black plastic ball, usually located passenger side front down low in the engine bay
This ball stores vacuum for the cab vents
When you accelerate the vacuum in the intake manifold drops to 0 if there is no "reserve vacuum" then vents will switch to Defrost at that time, when you get up to speed the vacuum in the intake comes back up and you get panel vents working again
The most common place to lose cab vacuum is on the Black plastic vacuum line that runs from firewall to the black ball, it gets a crack or melts near exhaust manifold
Look on the passenger side on firewall and you will see TWO vacuum lines coming out, one is black and one is Grey
The grey one runs to the heater hose bypass valve, you can actually use that one and follow it back to firewall to find the black one
The black one is the one you want to check
Follow it and feel it with your fingers, you can fix any cracks or holes with tape or cut out a section and use rubber vacuum line to splice it
If the line is OK then most likely you have a cracked Black Plastic ball, so it can't hold vacuum in reserve
Last edited by RonD; Dec 2, 2019 at 09:31 PM.
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From: MILILANI HI
ok, it was a vacuum leak with the grey line. it broke off whatever part that was. i found the broken line and looked where it could reach. found a rubber fitting with a small piece of the broken hose in it. got my air back! thanks ron!
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Joined: Dec 2014
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From: Peoria
But ONLY at wide open throttle(WOT), foot all the way to the floor and hold it down all the way, and FAN would stay running, it would just blow "a bit' warmer when AC compressor is shut off but it would have to be for 20 seconds or so of WOT before it got warmer
I think you have a leak in the Vacuum system for cab vents, so AC is not shutting off its just blowing out Defrost vent instead of panel or floor vents when you accelerate
The vents in the cab use "vacuum motors", vacuum holds the vent doors in-place, Defrost setting has both doors closed, so no vacuum needed
In the engine bay is a Vacuum Reservoir, black plastic ball, usually located passenger side front down low in the engine bay
This ball stores vacuum for the cab vents
When you accelerate the vacuum in the intake manifold drops to 0 if there is no "reserve vacuum" then vents will switch to Defrost at that time, when you get up to speed the vacuum in the intake comes back up and you get panel vents working again
The most common place to lose cab vacuum is on the Black plastic vacuum line that runs from firewall to the black ball, it gets a crack or melts near exhaust manifold
Look on the passenger side on firewall and you will see TWO vacuum lines coming out, one is black and one is Grey
The grey one runs to the heater hose bypass valve, you can actually use that one and follow it back to firewall to find the black one
The black one is the one you want to check
Follow it and feel it with your fingers, you can fix any cracks or holes with tape or cut out a section and use rubber vacuum line to splice it
If the line is OK then most likely you have a cracked Black Plastic ball, so it can't hold vacuum in reserve
I think you have a leak in the Vacuum system for cab vents, so AC is not shutting off its just blowing out Defrost vent instead of panel or floor vents when you accelerate
The vents in the cab use "vacuum motors", vacuum holds the vent doors in-place, Defrost setting has both doors closed, so no vacuum needed
In the engine bay is a Vacuum Reservoir, black plastic ball, usually located passenger side front down low in the engine bay
This ball stores vacuum for the cab vents
When you accelerate the vacuum in the intake manifold drops to 0 if there is no "reserve vacuum" then vents will switch to Defrost at that time, when you get up to speed the vacuum in the intake comes back up and you get panel vents working again
The most common place to lose cab vacuum is on the Black plastic vacuum line that runs from firewall to the black ball, it gets a crack or melts near exhaust manifold
Look on the passenger side on firewall and you will see TWO vacuum lines coming out, one is black and one is Grey
The grey one runs to the heater hose bypass valve, you can actually use that one and follow it back to firewall to find the black one
The black one is the one you want to check
Follow it and feel it with your fingers, you can fix any cracks or holes with tape or cut out a section and use rubber vacuum line to splice it
If the line is OK then most likely you have a cracked Black Plastic ball, so it can't hold vacuum in reserve
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Joined: Dec 2014
Posts: 427
Likes: 25
From: Peoria
tbh knowledge like this is expensive. This is the stuff people pay money for, or should. But its a forum and no one is forced to stay. However, i think for ron's contributions he should get a special nameplate or identifier or something. Maybe the mods can see this and make that happen?
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From: MILILANI HI
otherwise i'd have to climb the mountain to seek the old wise one, lol
thanks again for saving me $
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