Where is the pollen filter?
06-14-2007, 08:16 PM
#16
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Alan,
You can see the probe for the freeze switch in the right hand side of the last picture in my previous post.
Here are some others.
The freeze switch is located on the outside of the box and the probe enters the chamber below the expansion valve.
The connection to the blower is the same as earlier cars.
Hope that helps and if you need more pics just ask.
Roger
You can see the probe for the freeze switch in the right hand side of the last picture in my previous post.
Here are some others.
The freeze switch is located on the outside of the box and the probe enters the chamber below the expansion valve.
The connection to the blower is the same as earlier cars.
Hope that helps and if you need more pics just ask.
Roger
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
06-14-2007, 08:30 PM
#18
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Roger - thanks...
...ahh so where did they bolt the updated blower motor resistor pack - putting it in the airflow did make some sense - maybe its now bolted where the intensive washer tank used to be...
Who has a '94 and knows?
Alan
...ahh so where did they bolt the updated blower motor resistor pack - putting it in the airflow did make some sense - maybe its now bolted where the intensive washer tank used to be...
Who has a '94 and knows?
Alan
06-14-2007, 09:00 PM
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Modding the airbox so that it can take the pollen filter sure would make cleaning the evaporator a whole lot easier (he says as his putting back together his '91 and '89 after doing both cars' evaps...)
That's exactly where it is. However, it sure doesn't look like it gets a lot of air...
Originally Posted by Alan
...ahh so where did they bolt the updated blower motor resistor pack - putting it in the airflow did make some sense - maybe its now bolted where the intensive washer tank used to be...
06-14-2007, 10:56 PM
#20
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Thanks Rog and Worf ... dang how weird to stuff the resistor pack there. Anywy in the airflow was weird too. Should have been in the relay fuse panel.
06-14-2007, 11:21 PM
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Alan, are you sure that you haven't re-wired it (the resistor pack) already and just forgot about it? 
Well, anyhoo, the pic above is from my '94. Maybe you've got the bottle and the resistor pack close together? Or perhaps you don't have the airbox with the pollen filter?
Go take a look...
Well, anyhoo, the pic above is from my '94. Maybe you've got the bottle and the resistor pack close together? Or perhaps you don't have the airbox with the pollen filter?
Go take a look...
06-14-2007, 11:30 PM
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Originally Posted by Alan
Dave - mine is one of the early '94's that doesn't have the pollen filter...
one day it will...
one day it will...
06-19-2007, 01:17 PM
#27
Three Wheelin'
Why not just fit a filter in the mouth of the hvac box where the blower motor mounts with the rubber sleeve? I suppose since it's smaller air velocity is higher, and it's not up against the evaporator, so securing it may be a higher issue, but would the higher velocity mean a bit better flow through the filter?
06-19-2007, 01:40 PM
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Chris,
I did think about alternate locations - but I think that placement would be difficult - except for access - the filter would be much smaller and an irregular shape. The smaller surface area would mean it would clog a lot faster and would need to be freer flowing even when clean - the pressure differences due to the existing/new volume/velocity effects will also likely affect flow in some odd ways.
Plus ~duplicating the '94 factory set-up seems fairly doable... course I haven't started yet
Alan
I did think about alternate locations - but I think that placement would be difficult - except for access - the filter would be much smaller and an irregular shape. The smaller surface area would mean it would clog a lot faster and would need to be freer flowing even when clean - the pressure differences due to the existing/new volume/velocity effects will also likely affect flow in some odd ways.
Plus ~duplicating the '94 factory set-up seems fairly doable... course I haven't started yet
Alan
06-20-2007, 10:40 AM
#29
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Chris, Alan, et al,
I did make a filter for the airbox on my '88, putting it in the entrance to the airbox, just inside where the rubber boot connects the blower to the airbox. Not too difficult - made a frame from a piece of clothes hanger wire bent to the correct shape, glued some of the "blue" household air filter fabric to it and inserted it (after I'd thoroughly cleaned the AC evaporator of the 15 years of dirt and oil that was coating it). After about 3 months, I removed the filter and it was black with dirt etc. that it had filtered out. Sprayed it with detergent, washed it and re-installed (evaporator was still spotless).
I'm sure it does a good job as long as it is cleaned frequently, and I didn't see any significant reduction in airflow (probably was increased actually from the flow before the cleaning and installation of the filter!!!). My mid-year '94 GTS has the OE filter, and it is QUITE nice to have that.
Cheers,
Gary Knox
West Chester, PA
I did make a filter for the airbox on my '88, putting it in the entrance to the airbox, just inside where the rubber boot connects the blower to the airbox. Not too difficult - made a frame from a piece of clothes hanger wire bent to the correct shape, glued some of the "blue" household air filter fabric to it and inserted it (after I'd thoroughly cleaned the AC evaporator of the 15 years of dirt and oil that was coating it). After about 3 months, I removed the filter and it was black with dirt etc. that it had filtered out. Sprayed it with detergent, washed it and re-installed (evaporator was still spotless).
I'm sure it does a good job as long as it is cleaned frequently, and I didn't see any significant reduction in airflow (probably was increased actually from the flow before the cleaning and installation of the filter!!!). My mid-year '94 GTS has the OE filter, and it is QUITE nice to have that.
Cheers,
Gary Knox
West Chester, PA
06-20-2007, 11:06 AM
#30
Three Wheelin'
Originally Posted by Gary Knox
Chris, Alan, et al,
I did make a filter for the airbox on my '88, putting it in the entrance to the airbox, just inside where the rubber boot connects the blower to the airbox. Not too difficult - made a frame from a piece of clothes hanger wire bent to the correct shape, glued some of the "blue" household air filter fabric to it and inserted it (after I'd thoroughly cleaned the AC evaporator of the 15 years of dirt and oil that was coating it). After about 3 months, I removed the filter and it was black with dirt etc. that it had filtered out. Sprayed it with detergent, washed it and re-installed (evaporator was still spotless).
I'm sure it does a good job as long as it is cleaned frequently, and I didn't see any significant reduction in airflow (probably was increased actually from the flow before the cleaning and installation of the filter!!!). My mid-year '94 GTS has the OE filter, and it is QUITE nice to have that.
Cheers,
Gary Knox
West Chester, PA
I did make a filter for the airbox on my '88, putting it in the entrance to the airbox, just inside where the rubber boot connects the blower to the airbox. Not too difficult - made a frame from a piece of clothes hanger wire bent to the correct shape, glued some of the "blue" household air filter fabric to it and inserted it (after I'd thoroughly cleaned the AC evaporator of the 15 years of dirt and oil that was coating it). After about 3 months, I removed the filter and it was black with dirt etc. that it had filtered out. Sprayed it with detergent, washed it and re-installed (evaporator was still spotless).
I'm sure it does a good job as long as it is cleaned frequently, and I didn't see any significant reduction in airflow (probably was increased actually from the flow before the cleaning and installation of the filter!!!). My mid-year '94 GTS has the OE filter, and it is QUITE nice to have that.
Cheers,
Gary Knox
West Chester, PA
Related (and perhaps dumb) question - where does the HVAC blower get it's intake air when it's not in recirculate? Is it just ambient air from around the blower? Or is there someplace specific? The airbox appeared to only let air in from the inside of the car, and there's not really any other openings.