not your typical AC question
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Pro
Joined: Nov 2018
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not your typical AC question
Our AC systems pump refrigerant through the orifice tube, it turns to vapor and cools the evaporator. The blower blows air over the evap and into the ducts
So Why on these cars, when the refrigerant gets low, blows cool air on the right side vents and warm air through the center and drivers side vents
this is a 98 with manual ac system and all the doors are working properly.
With the correct charge in it it blows cold on all the vents
So Why on these cars, when the refrigerant gets low, blows cool air on the right side vents and warm air through the center and drivers side vents
this is a 98 with manual ac system and all the doors are working properly.
With the correct charge in it it blows cold on all the vents
Pro
Joined: Dec 2014
Posts: 682
Likes: 275
From: Cincinnati Ohio
Our AC systems pump refrigerant through the orifice tube, it turns to vapor and cools the evaporator. The blower blows air over the evap and into the ducts
So Why on these cars, when the refrigerant gets low, blows cool air on the right side vents and warm air through the center and drivers side vents
this is a 98 with manual ac system and all the doors are working properly.
With the correct charge in it it blows cold on all the vents
So Why on these cars, when the refrigerant gets low, blows cool air on the right side vents and warm air through the center and drivers side vents
this is a 98 with manual ac system and all the doors are working properly.
With the correct charge in it it blows cold on all the vents
When you are low on charge, all the liquid is boiled off before the refrigerant exits the evaporator. In these last evaporator tube(s), the gas is being heated and cannot remove as much heat from the hot incoming air. That makes the last part of the evaporator hotter leading to the hotter air temperature.
I don’t know the configuration of our C5 HVAC module but I can only assume that one side of the a/c ducts is predominantly fed by the inlet half of the evaporator right after the orifice tube, and the other side of the ducts predominantly fed outlet half of the evaporator (that then flows to the accumulator dehydrator.
Melting Slicks
Joined: Jun 2017
Posts: 2,568
Likes: 1,183
From: Conyers Georgia
Full refrigerant charge: The refrigerant exits the orifice tube as a low pressure, low temperature saturated liquid. As it passes back and forth through the evaporator tubes, the liquid refrigerant boils off as it absorbs heat from the air. This is essentially a constant temperature process so the entire evaporator core is at about the same temperature. As a result, the air exiting the evaporator is the same. In an ideal system, the very last bit of liquid gets boiled off just as it exits the final tube(s) of the evaporator, on its way to the accumulator/dehydrator. Since it is ideally boiling off liquid right to the exit and the entire evaporator is about the same temperature, it is about equally cooling the hot humid inlet air at all locations of the evaporator.
When you are low on charge, all the liquid is boiled off before the refrigerant exits the evaporator. In these last evaporator tube(s), the gas is being heated and cannot remove as much heat from the hot incoming air. That makes the last part of the evaporator hotter leading to the hotter air temperature.
I don’t know the configuration of our C5 HVAC module but I can only assume that one side of the a/c ducts is predominantly fed by the inlet half of the evaporator right after the orifice tube, and the other side of the ducts predominantly fed outlet half of the evaporator (that then flows to the accumulator dehydrator.
When you are low on charge, all the liquid is boiled off before the refrigerant exits the evaporator. In these last evaporator tube(s), the gas is being heated and cannot remove as much heat from the hot incoming air. That makes the last part of the evaporator hotter leading to the hotter air temperature.
I don’t know the configuration of our C5 HVAC module but I can only assume that one side of the a/c ducts is predominantly fed by the inlet half of the evaporator right after the orifice tube, and the other side of the ducts predominantly fed outlet half of the evaporator (that then flows to the accumulator dehydrator.
Thread Starter
Pro
Joined: Nov 2018
Posts: 674
Likes: 102
I don’t know the configuration of our C5 HVAC module but I can only assume that one side of the a/c ducts is predominantly fed by the inlet half of the evaporator right after the orifice tube, and the other side of the ducts predominantly fed outlet half of the evaporator (that then flows to the accumulator dehydrator.
That kinda makes sense, the air has to e split somewhere
That kinda makes sense, the air has to e split somewhere
