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Re: Rebuilt truck a/c not cooling as it should. by Sam Watson
Post New Message As Joe says, the AC was sized for a truck cab. AC's have a rating system, either expressed as BTU/H, which is merely the number of British Thermal Units removed per hour, or a refrigerent ton rating, equivalent to the amount of cooling of one ton of ice, or as it is used today, 12,000 BTUs removed per hour. Also, bear in mind that that AC cooling action is not consistant, but is usually expressed in the number of degrees drop in ambivant air temp at a given humidity factor. Let's pick a number such as ambient air temp of 70 degrees and 70% humidity. Using a 35 degree drop, then discharge air from your AC would be 35 degrees. Now lets take an ambivent air temp of 105 degrees, discharge air is now 70 degrees. Humidity enters into this also. To decrease humidity in "conditioned" air, incoming air is also passed through the heater core to help"dry" it out, as well as passed through the evaporater to cool it. Dry, cooled air "seems" cooler than it is because it uses our body's own cooling system---sweat evaporation---to aid it in the cooling effect. Given all this, you can see why presumeably your one ton rated dash air isn't going to treat all those cubic feet of air inside the rig, that takes both the 13,500 BTU roof AC's. BTW, "MAX" air setting is only 100% recirculated air, with no outside air admitted.
All Messages in ThreadAuthorDate
Post New MessageRebuilt truck a/c not cooling as it should. Robert 7-31-02  
  Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Joe 7-31-02  
  Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Sam Watson 8-1-02  
  Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Joe 8-1-02  
  Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Mallie 11-22-02  
    Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Robert 7-31-02  
      Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Joe 7-31-02  
        Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Parker 8-3-02  
          Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Sam Watson 8-4-02  
            Reply to MessageRe: Rebuilt truck a/c not cooling as it should. Rob 9-9-02  
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