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Old 07-13-2010, 09:08 AM
Randy Randy is offline
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Join Date: Apr 2005
Location: Northern Louisiana
Posts: 481
I revamped all the vacuum pods several years ago. I also can hear the difference in blower sound when on Recirc. I will verify the flap operation. I know that when in recirc there is a little better performance. I also note that, when in econ, there is no apparent heating of the air, as would occurr if the heater core were flowing coolant, just air at ambient temp.
as a reference I put gauges on my 2006 GMC truck. At idle in high blower and recirc, 85 ambient, the suction pressure holds steady at 35 psi. Seems like 35 to 40 PSI suction on the 420 would cool a little better. Truck is very cold. As the Mazda people say, "Hummmmm...".
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