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Go Back   Australian Ford Forums > Ford Australia Vehicles > Small and Mid Sized Cars > Escort, Cortina, Sierra and Capri

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Old 13-05-2021, 04:08 PM   #1
Reno
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Default Cortina TF Ghia 1981

Ever had problems with the A/C Vacuum Distributor Valve (behind the dash).

Mine functions perfectly when motor cold but after driving 10 klms it then directs 50% of the air flow to the windscreen (something within the valve changes).

Can not get a replacement from Fords or EBay.

So if you experienced same problem what did you do ?
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Old 13-05-2021, 04:46 PM   #2
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Default Re: Cortina TF Ghia 1981

Is it a 2 litre or a six?
Ford air cons from that time shared a few parts between models, you maybe able to expand the search to Escort and Falcon. Got a part number?
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Old 17-05-2021, 09:33 AM   #3
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Default Re: Cortina TF Ghia 1981 4.1 Xflow 6 cyl

Thank you for your response will enquire from Fords if the Cortina part number which is Basic Part Number 19B919 and Aust Part Num YH24 are the same for Escorts and Falcons.

Should have mentioned that this is a 6 cyl xflow
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Old 05-06-2021, 11:14 AM   #4
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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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Old 03-07-2021, 06:06 PM   #5
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Default Re: Cortina TF Ghia 1981

Quote:
Originally Posted by vdo View Post
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.
Thank you VDO never considered the aspect of leakage I am in Brisbane also
Do you do vacuum analysis ?

Rgds

Reno
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Old 04-07-2021, 09:03 AM   #6
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Default Re: Cortina TF Ghia 1981

Quote:
Originally Posted by Reno View Post
Thank you VDO never considered the aspect of leakage I am in Brisbane also
Do you do vacuum analysis ?

Rgds

Reno
I don't do analysis. I'm an Instrument and electronics tech.
I know about dash operations functions etc.

The leak will be most likely in the engine bay where the main vacuum feed is, or sometimes the vacuum control switch in the dash could be the culprit.

Listen for hiss sound, (with engine running).
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Old 21-07-2021, 06:58 PM   #7
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Default Re: Cortina TF Ghia 1981

Your advice is appreciated

Thanks
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Old 21-07-2021, 07:47 PM   #8
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Default Re: Cortina TF Ghia 1981

Quote:
Originally Posted by Reno View Post
Mine functions perfectly when motor cold but after driving 10 klms it then directs 50% of the air flow to the windscreen (something within the valve changes).
Is it related only to engine temperature?
Does it change with throttle-position?
My XF used to shift to the floor vents when I put my foot down.

If it is only temp related, then the most likely culprit is the notorious Emissions control valve.
Mounted near the thermostat, is a 3-pronged (temperature-controlled) vacuum-valve. IIRC the originals were a reddy-brown colour. When the car gets up to operating temp, the valve opens and redirects the vacuum. (I think it may go to the EGR valve?)
Any way, they are notorious for getting brittle and snapping, opening up the vacuum to the atmosphere.
If that control-valve is intact and working, it could be the EGR valve itself that's stuffed and leaking.
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