Cold air blows through the heater after ten minutes of warm up. Heater does not work properly until Jeep has been drivin at highway speeds. Would this possibly be a thermostat stuck open?
Could be the thermostat if it was just stating to go bad,could also be a vacume problem not letting the door for the ac/heat close all the way for a few min.and if its really cold out like below 35,then its going to take longer to warm up,my jeep takes like around 20 min at idle to warm up.yours could be a case of over cooling in cold weather too ie(electric fans on before it warms up)that would be the thermostatic sensor.
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