99? Ram random heat

[chedched]

My buddy has a 99 Ram and the way he is describing it the heat works about 1 day a week. He says when it isn't working, the air is warmer than outside but not warm/hot. He says it is completely random and nothing changes to make it work again. My first thought is something with the blend door but I don't have much experience with the 2nd Gen.

Any help guys? My buddy lives 3 hours north so I can't do any testing of different components. I'm just trying to help him out as his trans is the reason the truck is in the shop right now.

 

[jf5.9]

My bet is the heater core is clogging up. I would flush the core and if at all possible the rest of the coolant system.

This happened to me on my 2000 Dakota - never had heat in it until one night I smoked a deer in it and broke some of the clog free. Had a lil heat after the deer so flushed the core the next day and had heat like you wouldn't believe.

 

[chedched]

I guess it just doesn't make sense to me. He was thinking along the same lines but I figured if it still worked randomly I didn't think it was a coolant flow issue.

 

[chedched]

Anyone else?

 

[Johnn123]

My bet is the heater core is clogging up. I would flush the core and if at all possible the rest of the coolant system.

This happened to me on my 2000 Dakota - never had heat in it until one night I smoked a deer in it and broke some of the clog free. Had a lil heat after the deer so flushed the core the next day and had heat like you wouldn't believe.

+1 id bet this is the issue.