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Message: <blockquote data-quote="Dennis Shelley" data-source="post: 1022536" data-attributes="member: 58803">Green has to be coolant, tranny fluid is red, motor oil is brown/amber, power steering fluid is red, brake fluid is clear (when new).The leak is outside the vehicle, look for a radiator hose leak. Any leak in the engine can cause the vapors to be swept into the cab. Also look for a heater hose leak. This is the hose that brings the hot engine coolant into the cab for the heater to use. these hoses are about the size of a garden hose on the passenger side of the firewall. If the heater core is leaking, the coolant would be pooling in the cab on the floor. It seems positive (good news) the leak is outside the cab. Replacing the heatercore in the cab is a four letter word, several times over. Let us know how this is resolved. Good luck.Dennis</blockquote>