TT: During previous air conditioning service, leakage prevention agent (A/C stop leak) may have been
added to the A/C system. Adding stop leak products to the A/C system is not a recommended or
approved Toyota repair process. During A/C service, moisture enters the A/C system, and can react
with the previously added A/C stop leak, forming a gelatinous substance. The gel substance that
forms can cause the A/C compressor to bind and or seize.