AC Works only when engine is revving high

Your fan is turning faster and cooling the freon.

Even though your condensor fan is moving doesnā€™t mean its moving at the right speed

If the compressor is not engaging you would never get cold air

Welcome to the forumā€¦

This is a 8 year old thread and the OP has not been on in 8 years eitherā€¦ Iā€™m sure the issue has either been taking care of or the OP has sold the vehicleā€¦

You will have better luck responding (helping) to current threads then digging up old onesā€¦