Hey how are you
1- Few things we need to check , Freon level , do you have ac gauges to check low side and high side pressure , we need to see around 30 psi on low and 150 to 175 max on high while running ?
2- yes the ac condenser fan has to be running at all times when the ac is on , ?
3- if we have restriction in the system ,a low Freon level , fan not running it will cause that , the fact when driving on high way and not hot ,tells us that fan operation needs checked for sure ,since driving down the high way the air flow is cool condenser down so fan not necessary but it is at idle if not running the high pressure will rise passed 200 psi and high pressure switch will cut ac compressor for seeing high pressure
4- if the freeon level low ,the low pressure switch will cut off the system if it is seeing low pressure at idle as example since not enough Freon circulating
5- so lets start here , Freon levels and then fan operation and we can move forward
6- now the freeon has to be exact , so if we have to much it want cool correctly and to little will not cool correctly ,now we also have ambient temp sensor that read outside temp if that is erratic that will interfere with ac cooling ,but lets go one step at time
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