88 FSJ GW Heater Issue - JeepForum.com

 
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post #1 of 5 Old 01-31-2013, 05:49 PM Thread Starter
PITA88FSJ
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1988 FSJ Wagoneer 
 
Join Date: Jan 2013
Location: Prescott Valley
Posts: 18
88 FSJ GW Heater Issue

Hey all,

I bought my first FSJ yesterday and noticed an issue with my heater. There is no air getting to the cab. I removed the blower motor today and replaced it. Found a tree's worth of pine needles in the unit. Cleaned all of it out. Reinstalled the fan, works great but there is no air getting to the cab still. Got LOTS of air seeping out of the heater box seal around the core. Is there a gate between the firewall that is vacuum activated? What am I missing?

Thanks for the help!

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post #2 of 5 Old 01-31-2013, 06:02 PM
pleontks
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1976 J-Series Truck 
 
Join Date: Apr 2010
Location: Whetstone, Az
Posts: 1,131
you are correct. under the dash passenger side are the vacuum operated doors. pulls vacuum from your heat switch, which gets it from your vac canister

Beauty is in the eye of the jeepowner.
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post #3 of 5 Old 01-31-2013, 06:53 PM Thread Starter
PITA88FSJ
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1988 FSJ Wagoneer 
 
Join Date: Jan 2013
Location: Prescott Valley
Posts: 18
Cool thanks! I'll check it out tomorrow. I almost tore the core case apart thinking there might have been a debris clog beyond the core in the vent tube. Does the Vac line connect to the control on the dash like in a TJ?
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post #4 of 5 Old 02-02-2013, 10:17 AM Thread Starter
PITA88FSJ
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1988 FSJ Wagoneer 
 
Join Date: Jan 2013
Location: Prescott Valley
Posts: 18
Update: I went through the ol' gal and found the vacuum line was off. I reconnected it hoping that was the issue. Sadly I must report that she won't switch to defrost. Gonna check the vacuum line from the sending unit and make sure she has vac pressure. I noticed that she has a "TAN" circular vacuum device on the left front inner fender, connected to the vac canister. I assume this is for the cruise control. My FSJ has a Carter carb on her and the cruise has been disconnected (speedo cable was replaced with a straight one)
so it is not needed, except that I noticed the vac line from this box goes into the cab. Can this unit be bypassed and the cab vac line connected directly to the vac cannister? or does this unit serve another purpose?

Thanks for the help!
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post #5 of 5 Old 02-04-2013, 07:21 PM Thread Starter
PITA88FSJ
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1988 FSJ Wagoneer 
 
Join Date: Jan 2013
Location: Prescott Valley
Posts: 18
Final UPDATE: I fixed the heater! Got both dash and floor working great. Turns out I over looked a tiny vac line under the hood that attached to the vac "ball" mounted in the center of the firewall, top fitting right side (as your looking at it) works the vac mech for the defrost control. Now on to my electrical and fuel issues!
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