A new old Cherokee, with HVAC "fun" built in - JeepForum.com
 
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post #1 of 4 Old 07-07-2017, 10:33 AM Thread Starter
SooperSteve
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A new old Cherokee, with HVAC "fun" built in

i recently joined the forum, although I admit I have read articles in here for years. Thanks for all the previous help. I recently purchased an 89 cherokee limited. It's been "fun" upgrading and replacing parts as they brake. Axle bearings, shocks, front springs, lower control arms, wheel bearings, vacuum lines, TPS, etc, etc...

I have an hvac vent question. Although I have searched all over I can not find a solution. Everything I read says vacuum lines. However I do not believe that is the culprit. The AC and Heat work, the air however only blows through the defroster, and before you make a snap suggestion about vacuum lines, it does change. I can select the vent or floor and the defrost stops blowing however air does not come out of the vents or floor, it just blows behind the dash. you can hear it, change from defrost to vent or floor but no air comes out. I am about to commit a weekend to pull the dash, but thought I would post here first. Maybe there is an old Cherokee mechanic that can share an easy fix or suggest something.

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post #2 of 4 Old 07-09-2017, 08:39 AM
cruiser54
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Very common.

Lookie here:
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Vac ball routing.jpg  

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post #3 of 4 Old 07-14-2017, 01:45 PM Thread Starter
SooperSteve
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Cruiser, Thanks for the response. The jeep was wrecked at some point in a previous life and their is no reservoir. I understand that without vacuum pressure the default setting is defrost. however I can change the airflow it just doesn't blow out. this was working exactly as is except it would switch to defrost under acceleration and I know that is caused by the missing reservoir. what I had working stopped for unknown reasons. still think vacuum leak? could the vacuum lines behind the control switch be leaking?
thanks again.
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post #4 of 4 Old 07-15-2017, 06:36 AM
cruiser54
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Quote:
Originally Posted by SooperSteve View Post
Cruiser, Thanks for the response. The jeep was wrecked at some point in a previous life and their is no reservoir. I understand that without vacuum pressure the default setting is defrost. however I can change the airflow it just doesn't blow out. this was working exactly as is except it would switch to defrost under acceleration and I know that is caused by the missing reservoir. what I had working stopped for unknown reasons. still think vacuum leak? could the vacuum lines behind the control switch be leaking?
thanks again.
Could be a vacuum leak or the vacuum hoses at the control, or a bad actuator under the dash.

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