Mechanics

AIR BLOWS WARM WHEN ENGINE UNDER SL

1989 Ford Station Wagon

Air Conditioning problem
1989 Ford Station Wagon V8 Two Wheel Drive Automatic 106789 miles

My A/C system will only work well at idle condition. When the engine is even under the slightest load; the fan shuts off and the air becomes warm. Only after returning to idle or unloaded conditions does the system return to normal. I've checked the vacuum tank ( " coffee can" ) and that holds good vacuum; I was thinking the vacuum check valve may be bad but I wouldn't think that would effect fan speed. Any thoughts?
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Henry Ackell
August 24, 2010.



Does the fan stop running or does the air flow direction change?