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Old 09-14-2020, 03:54 PM   #1
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Defrost/Heater vents only

So, not sure when it happened, but our last trip all worked fine. This weekend, take it to a local dog show, and turned on A/C and it only came out the defrost vents.


2002 Damon Intruder on a Workhorse W22 chassis.



The controls are your typical Delco I guess. Turn the switch A/C, vent, heater, the air comes only from defrost vents, and very little from floor area.


Are these vacuum only controlled or electric?



Thanks.
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Old 09-14-2020, 04:44 PM   #2
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Eric1959-

Defroster-only is typically a sign of a vacuum leak. Check the vacuum lines that are in the vicinity of the A/C unit. If you don't find a leak there, follow each line to its far end, looking for a leak.
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Old 09-18-2020, 02:30 PM   #3
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UPDATE with pics

Ive traced as much of the vacuum lines as I could. Not sure what this thing is, but it had one line attached.
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Old 09-18-2020, 04:53 PM   #4
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Eric1959-

That's a vacuum reservoir. Per this picture from this post, it looks as if there should be a second line.

Try plugging the open port up (temporarily) and see if your A/C works as it should.
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Old 09-18-2020, 06:50 PM   #5
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Quote:
Originally Posted by l1v3fr33ord1 View Post
Eric1959-

That's a vacuum reservoir. Per this picture from this post, it looks as if there should be a second line.

Try plugging the open port up (temporarily) and see if your A/C works as it should.
The hose from the engine for vacuum is not hooked up.
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Old 09-19-2020, 05:19 AM   #6
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Thanks!.. I wondered if there should be a hose to that, couldn't find one laying around but will look closer today.
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Old 09-19-2020, 10:32 AM   #7
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FIXED!

Yep, there was a hose that I didn't notice before it was disconnected and laying where I didn't see it at first.


Thanks guys!
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Old 09-19-2020, 02:23 PM   #8
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Hose may have harden up and will not stay. Go and by a new section of hose and a one way check valve from an auto parts store. The check valve in the center of hose will not let vacuum drop off when you hit a steep hill and go from vent to defrost. Install the valve so you have vacume from the engine but can not put pressure to the engine through the hose. Then fasten hose to nipple (on the round ball, not yours) with a small zip tie.
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Yep, there was a hose that I didn't notice before it was disconnected and laying where I didn't see it at first.


Thanks guys!
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