the quickest way i found my vacuum gremlin was to go under the hood and find the door lock vacuum lines. find a yellow round cylinder that has 2 vacuum lines connecting into it from the firewall. those are your door lock vacuum lines. so what you do is disconnect that yellow cylinder in the front (where there is only one line going in) and plug it up.

what you have just done is isolated the door locks from the rest of your vacuum system. if get a mityvac, you can now see if you still have a leak somewhere.

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