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Heating & Air ConditioningDoes your heater blow cold air? Does your air conditioning blow hot air? Post your all of your technical issues related to your heating, heating core, air conditioning unit and controls here. Don't wait until it is to late to get these important vehicle functions fixed.
I have a 99 Ford F250 diesel 7.3 PS. My a/c will not run on low rpm's. It kicks on in high rpm's only. This is a problem only during the hot summer months with temps over 90 degrees. In cooler temps we have noticed no problem.
I have found with my 99 7.3, that about every two years I will have to recover the 134 and replace the orfice tube. After that it's ok for about two years. Also make sure the condensor in front of the inter-cooler/radiator is clean (bugs, road debris etc..). anything that blocks airflow will reduce the cooling capacity.
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A/C Problems 
Linear Mode
