90 HVAC vacuum source
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Joined: Sep 2005
Posts: 64
Likes: 1
From: Columbus Ohio
90 HVAC vacuum source
Does anyone know how the HVAC programmer connects to the vaccum source ? ( 90 TPI ) The FSM does not specify the location so I traced out the underhood vacuum lines. I can see where the vaccum is taken from the plennum and goes to the storage tank and cruise control but I cannot find the point where it feeds the HVAC programmer.
As you may have guessed my heater is stuck on defrost. I can hear the relays clicking on the programmer when I select various modes so I'd like to verify there is vacuum before I dig deeper.
Thanks...
As you may have guessed my heater is stuck on defrost. I can hear the relays clicking on the programmer when I select various modes so I'd like to verify there is vacuum before I dig deeper.
Thanks...
Melting Slicks
Joined: Mar 1999
Posts: 2,830
Likes: 20
From: Las Vegas Nevada
Of the two ports on the rear right corner of the upper plenum it should be the rear one. The diagram below is for a '91. Yours should be the same. the vacuum line leading to the port should be black.
hope this helps,
hope this helps,
