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Old Dec 2, 2019 | 01:11 PM
  #16  
StonedGrey's Avatar
StonedGrey
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Joined: Jun 2018
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Rapid supp heater works well when set to 1/2 fan speed and temp turned to its highest setting but not “max heat”. This is for the manual climate control trucks. I have slightly warm air blowing out after about 2mins of idle or driving. Then it proceeds to get warmer quickly. I can have hot air blowing out after 4-5mins of driving or idling but i also dont have an EGR cooler. Not sure if that changes things bc i dont know which of the 2 cooling systems the heater core is connected too.

i dont know what the lariat and higher setting should be with auto climate control for the RSH to work.

Read the owners manual.
also a winter front may help your situation.
 
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