A/C Re-circulate switch does not light.

[Tyger]

Originally Posted by TheViper

The only disadvantage in the air flow of having the A/C off and using only recirculated air is loosing the ram air effect.
Michael

Yes, exactly. If you tape over the intakes, there won't be any air coming from outside the cabin, only "recirculated" air from the footwells (IF you put on the fan). But when the AC is off, the air in the footwells is very often hotter than the outside air, as I'm sure you've discovered

[Clinton]

Originally Posted by TheViper

The hot air comes from two sources.
1) Heater matrix-In my case shutting off the matrix reduced temperatures only 2'.
2) Radiators/Condenser/Cooling System-Virtually nothing can be done here.
IMPROVED A/C & HEATING SYSTEM
Michael

1) I have shutted off the heat matrix
2) I understand the Radiators/Condenser/Cooling System cause the hot air, but where is the gap for the hot air coming into the vent? Can we do anything to the gap?

[TheViper]

However, even if the outside air is cooler than the footwell with the AC off, that air still has to travel though the system where it is heated further.
The only way to prove if the vent temperatures are cooler with the AC off and air drawn from either the nose or footwell intakes is to take readings.
It is not an issue to me because when the fan is on, so is the AC.
Michael

Originally Posted by Tyger

Yes, exactly. If you tape over the intakes, there won't be any air coming from outside the cabin, only "recirculated" air from the footwells (IF you put on the fan). But when the AC is off, the air in the footwells is very often hotter than the outside air, as I'm sure you've discovered

[Tyger]

The whole heater/AC unit evidently has to come out to get at the recirc flapper and actuator. However, since the recirc light isn't coming on, I'm guessing the first thing to check would be the fuse to the actuator. It's not obvious (to me) which fuse that would be. Any ideas?

[TheViper]

That would be fuse F15, however if that, & the switch checks out OK, then I would conclude that the fault is probably in the SPM. BTW, just because there is no indicator light, does not mean that the switch is not working.
Michael

Originally Posted by Tyger

The whole heater/AC unit evidently has to come out to get at the recirc flapper and actuator. However, since the recirc light isn't coming on, I'm guessing the first thing to check would be the fuse to the actuator. It's not obvious (to me) which fuse that would be. Any ideas?

There may be no gap, just heat soak. BTW, how did you shut off the matrix?
Michael

Originally Posted by Clinton

1) I have shutted off the heat matrix
2) I understand the Radiators/Condenser/Cooling System cause the hot air, but where is the gap for the hot air coming into the vent? Can we do anything to the gap?

[Clinton]

Originally Posted by TheViper

That would be fuse F15, however if that, & the switch checks out OK, then I would conclude that the fault is probably in the SPM. BTW, just because there is no indicator light, does not mean that the switch is not working.
Michael


There may be no gap, just heat soak. BTW, how did you shut off the matrix?
Michael

Bypass heat matrix, no hot water goes to matrix