a/c question
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Posting Guru
Joined: Oct 2006
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From: New London, Mo
a/c question
I just bought a 99 f350 I can't get any cold air out the vents. Compressor operates fine. Everything else works but no a/c. What shuts off coolant flow to the cab when a/c is on. What does the temperature control change to make it hot or cold.
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Logistics Pro
Joined: Jun 2005
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From: AZ
Nothing shuts the coolant off when you turn on the ac...you can mod with a vacuum valve or a simple shutoff valve in either of the heater hoses coming to the firewall. When the key is turned on, before actually starting, do you hear the vacuum pump running?
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From: New London, Mo
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Post Fiend
Joined: May 2009
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From: Pea Ridge, AR
Should be located behind the glovebox, on top of the ductwork. It has an electric motor that moves a door about 90 degrees, not near the problems with these trucks as there were with earlier fords, but its a possibility.
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Post Fiend
Joined: Nov 2007
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From: Payson, AZ
This is for the manual HVAC system. I don't have it for the Auto Climate system. This plus a vacuum gauge are good trouble shooting tools.
Have you actually hooked up gauges to be sure the compressor is actually working and the r134 charge is good?
Have you actually hooked up gauges to be sure the compressor is actually working and the r134 charge is good?
Cargo Master
Joined: Jan 2001
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From: Slatington, PA
It won't run every time, only when the vacuum is low. Its setup like an air compressor, on at a low vacuum and off at a higher vacuum. The fact that you can get the air to blow out of the floor and dash means you have vacuum. When you don't, the air will only come out the defrost vents.