Thread: Cortina TF Ghia 1981
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Old 05-06-2021, 12:14 PM   #4
vdo
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Join Date: Jul 2013
Location: Brrisbane QLD
Posts: 1,184
Valued Contributor: For members whose non technical contributions are worthy of recognition. - Issue reason: Consistently offers competent electrical and technical advice regarding Ford electrics, especially instrument clusters. He's retired but offers his services for repairs for next to nothing. 
Default Re: Cortina TF Ghia 1981
Air to the windscreen is the default flow when there's not enough initial vacuum. It might be something as simple as a a split vacuum line in the engine bay getting warmed up and leaking worse when soft and warm.
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