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Old 06-21-2010, 08:44 AM
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Car: '86 Iroc-Z, '98 A4 Quattro
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73
tpi help

I have a loose vacuum hose and the diagrams tell me it has to go to the HVAC. Does this mean it goes to the AC pump or to the firewall. Instructions would be greatly appriciated.
Old 06-21-2010, 09:13 AM
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Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: tpi help

Depends, is it the long one going to the heater valve? The only other one would be the vac soruce to the heater/ac controls (or am I missing one??). Do you have a pic?
Old 06-22-2010, 09:47 AM
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Car: 89 FORMULA FIREBIRD, 86 CHEVY CAMARO
Engine: L98, LB9 RESPECTIVLY
Transmission: 700 R4 (BOTH)
Re: tpi help

If it comes off a "t" fitting on the back of the plenum it goes to the hvac which goes through the firewall. The line may be hard to find as it is wrapped in a bundle that is behind the motor (or at least it was in my '89). I had to cut the tape away to find the line.

Also, my 86 had a box on the firewall above the wiper motor with a vac line attached to it, that could be it also.
Old 06-22-2010, 07:23 PM
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Car: '86 Iroc-Z, '98 A4 Quattro
Engine: 5.0 TPI
Transmission: 700R4
Axle/Gears: 2.73
Re: tpi help

tpi help-tpi.jpg

here is the picture thanks for the help
Old 06-22-2010, 07:47 PM
  #5  
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Car: 89 FORMULA FIREBIRD, 86 CHEVY CAMARO
Engine: L98, LB9 RESPECTIVLY
Transmission: 700 R4 (BOTH)
Re: tpi help

that goes on a nipple on the box above the brake booster

I've traced it in red in this pic of my 86 Z
Attached Thumbnails tpi help-engine3a.jpg  
Old 06-22-2010, 07:52 PM
  #6  
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Join Date: Jun 2000
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Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: tpi help

Hey, one of those mail box shaped vacuum canisters, I didn't even know 86 and earlier had those. Mine (87 and later) all have the round ball behind the fender.
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