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Join Date: Oct 2012
Posts: 4
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Expansion Valve
1988 911 3.2 I am installing a new expansion valve, does the thermal coil attach to anything?
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10-04-2012, 05:55 PM
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Join Date: Oct 2006
Location: MYR S.C.
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yes. it should be attached to the LOW side line exiting the evap. wrap it with that black "tar" stuff to insulate it. its best if you can attach it at about the 4 or 5 oclock position or the 7 or 8. not on top.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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10-05-2012, 03:35 AM
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Location: Dallas
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Does the whole expansion valve coil need to be covered or only the pigtail part that's touching the low side line?
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Buck '88 Coupe, '87 Cab, '88 535i sold, '19 GLC 300 DD Warren Hall, gone but not forgotten |
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10-05-2012, 05:51 AM
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Join Date: Oct 2012
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a/c fixin
Great. Thanks. Any ideas where to get that black tar stuff?
Quote:
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10-05-2012, 05:57 AM
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just the bulb. there is usually a clip that holds the bulb against the line.
basically, the bulb measures the temp of the refridgerant leaving the evap and opens or closes the expansion valve per the demand of the heat load
__________________
86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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10-05-2012, 06:41 AM
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Fleabit peanut monkey
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1981 911SC Targa |
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10-05-2012, 07:33 AM
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Location: Dallas
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I've wondered if we could use some of that spray in expanding foam in this situation since getting the tape around the bulb can bt a PITA and hard to reach in tight spaces with a bunch of other stuff near and in the way.
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Buck '88 Coupe, '87 Cab, '88 535i sold, '19 GLC 300 DD Warren Hall, gone but not forgotten |
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10-05-2012, 07:43 AM
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it would suck when you have to replace it again.
__________________
86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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10-05-2012, 07:59 AM
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Fleabit peanut monkey
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Maybe not with the latex foam. Not the petroleum/solvent based stuff.
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1981 911SC Targa |
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10-05-2012, 08:07 AM
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The correct position for the capillary sensing pigtail (aka 'bulb') is 12 o'clock, directly on top of the evaporator outlet tube.
You can use whatever insulating material you wish to wrap around the pigtail, however Prestite is the most common. And, don't forget to seal off the opening in the top of the evap box where the evap outlet pipe and TEV inlet pipe exit. You don't need to wrap the entire TEV in insulation, only the cap sensing pigtail. |
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10-06-2012, 04:24 AM
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u are correct. i brainfarted
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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10-09-2012, 05:20 AM
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1981 Porsche 911 SC Targa
