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First time poster, long time follower. I have an 05 off road that I recently discovered is having a bit of a cabin heating problem. I noticed that when I am sitting at a light the vents are blowing cool air even though the temp dial is all the way up. I don’t start to get heat again until I am actually moving. Any thoughts from the gear heads out there?
 

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First time poster, long time follower. I have an 05 off road that I recently discovered is having a bit of a cabin heating problem. I noticed that when I am sitting at a light the vents are blowing cool air even though the temp dial is all the way up. I don’t start to get heat again until I am actually moving. Any thoughts from the gear heads out there?
Have you checked fluid level in the coolant overflow reservoir? I believe this is a low coolant issue though.
 

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Have you checked fluid level in the coolant overflow reservoir? I believe this is a low coolant issue though.
I had the same problem, and it was definitely low coolant. I also replaced the caps because there was some evidence of overflow.
 

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I had the same problem, and it was definitely low coolant. I also replaced the caps because there was some evidence of overflow.
Just not enough coolant to go through the heater core solenoid valve? And you replaced the radiator pressure cap?
 

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Agree low coolant. Happened to me last year when I had a leak in the radiator. It was such a small leak that the first symptom I noticed was exactly what you are describing.
 

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what happens is air bubbles get in the heater core, and somehow that impedes flow through it. in addition to topping off the coolant you may try elevating the front of the truck and purging or " burping" the system. this will get the air bubbles out of the heater core.
 
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