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Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
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My Siena 02 used to make whistling sound (low) upon AC

Customer Question

Good morning. My Siena 02 used to make whistling sound (low) upon AC switch turn on. I took to local mechaninc, he filled in refrigerant, drained oil, & check leak. Now when I turn AC on only air is blowing. I ahve not called the mechanic yet. What you suggest?
Submitted: 2 years ago.
Category: Toyota
Expert:  Toyota Service replied 2 years ago.

Hello. Welcome to Just Answer. Please allow me to assist you. The first thing I would be looking at would be the possibility that the 'Schraeder' valve that allows the refrigerant into the system may have stuck, and allowed the refrigerant to seep out. This would be easily detected when he attaches his manifold gauges to the system. If there is no pressure in the system, it has leaked out.

Expert:  Toyota Service replied 2 years ago.

The 'schraeder' valve is much like the valve on the wheels where you put air into the tire.

Expert:  Toyota Service replied 2 years ago.

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