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Old 07-20-2015, 10:42 AM   #1
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Dash air question..

My dash air will blow snow flakes when I'm tooling around at 45-50.. But when I hit the big road at 65-70 it hardly cools at all . Any ideas why this is happening? Thanks !
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Old 07-20-2015, 03:54 PM   #2
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Do you have the dash control set on recirculate or fresh air? Perhaps the fresh air is hot and humid enough that it's tougher to cool. Also, at faster speeds, you are circulating engine anti-freeze at a faster rate/higher pressure. If your heater control valve is allowing hot coolant into the heater core, you'd be canceling out the A/C. Try pinching off a heater hose with a set of vice grips and see if cooling improves. If it does, either adjust, replace heater control valve OR install a simple ball valve shut off in the hose to the heater core. Shut it off for summer and when you don't need warm air for defrost.
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Old 10-03-2015, 06:29 PM   #3
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Quote:
Originally Posted by BFlinn181 View Post
Do you have the dash control set on recirculate or fresh air? Perhaps the fresh air is hot and humid enough that it's tougher to cool. Also, at faster speeds, you are circulating engine anti-freeze at a faster rate/higher pressure. If your heater control valve is allowing hot coolant into the heater core, you'd be canceling out the A/C. Try pinching off a heater hose with a set of vice grips and see if cooling improves. If it does, either adjust, replace heater control valve OR install a simple ball valve shut off in the hose to the heater core. Shut it off for summer and when you don't need warm air for defrost.
Which hose exactly? Thanks
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Old 10-03-2015, 08:20 PM   #4
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The connection you have circled is a high pressure air conditioning hose. So is the one the blue line is leading to. You can tell they are high pressure because of the metal crimped connectors between the rubber hose and the metal tube leading to the A/C fitting. The heater hose(s) are to the right of that circle. It really doesn't matter which hose you put the valve in, it will stop circulation of coolant through the heater core. Those hoses are clamped by the pinch spring clamps.

The black plastic ball with the question mark is the vacuum reservoir, it stores up vacuum to operate the plenum doors to divert air flow from floor, dash, and defrost.
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