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Old 09-10-2017, 04:29 PM   #8
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 39,021
 

2003 L-Series 3.0L Sedan
Default Re: URGENT input needed - military wife traveling & near-stranded

I listened to the unzipped file - I may be deaf (did wear ear buds) and cannot seem to discern much, other than what you described. I didn't hear dog panting but do hear the turn signals and a soft whining sound. Everything else seems to be muffled. Human ears are more perceptible than cellphone or portable recorders unless you're carrying million dollar sound recording equipment to play back in surround sound.

If I were to guess, the ac cycling from cold to nothing/hot may be one or both(?) cooling fans not running. AC always demands cooling fan(s) as soon as ac is turned on - one way to know if cooling fans are running. Opening the engine hood with engine idling then turning on ac should turn on one or two cooling fans at low speed. With low speed fan(s) running, there may be no noise and require looking into the front grille to see if the front fan blades are spinning. If two fans are used, the rear fan might be behind the radiator and looking carefully for spinning blades. On hot and humid days, your Outlook may have three fan speeds so high speed will be heard better with the hood open and standing in front of the suv. If one or two fans aren't seen running with ac on, this may be either a blown fuse(s) or a worn out fan. Without ac use, the cooling fan(s) are only needed when engine coolant begins to overheat where the engine computer senses coolant temps and determines when to turn on cooling fans. A dead fan or blown cooling fan fuse would allow the engine to overheat. If the engine overheats, this may also led to the transmission overheating. A cascade effect.

There are two radiators on most vehicles if ac is used. One is the radiator for the engine cooling system and the other radiator in front of the cooling system radiator is the ac condenser coil. The ac condenser coil always sits in front of the engine radiator so both heat up when ac is used. When both heat up (ac turned on) the engine computer automatically turns on one or two cooling fans (starting in low speed) to have a continuous airflow blowing thru both radiators to prevent the ac from overheating and shutting down as well as keep the engine cooling system from overheating - hot air from the ac condenser coil flows back into the radiator that's already hot.

Either check for one or two cooling fans turning on as soon as ac is turned on or have GM diagnose your troubles. This is only one guess.

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