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there is a timer on the remote start. IT describes this in the manual. You can extend the remote start cycle once or twice only. I think each press only gives you 10 minutes of engine run time. THis isn't a defect- it's not designed to run for 30 minutes in park. Also, there is a setting in the car that controls the max fan speed (to limit noise)- you should make sure your setting allows for MAX fan speed.
 

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The setting is on max and it makes no difference. The fan does not blow full blast unless you go out and start the vehicle.
during auto start the fan should always blow at max speed until a desired temp is reached. If it's not then something isn't working right. The setting for fan speed only applies when the vehicle has actually been started from within the car. . You can extend the remote start cycle from the remote, you don't need to go to the vehicle. It must very cold for 15 minutes of run time to have little effect on the cabin temperature. American (or american branded I should say) vehicles typically have good HVAC performance.
 
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