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Hello, I have an 01 24 valve with no heat or Ac. I don’t really care about the AC, but would love to have heat. I have replaced the heater core and the thermostat, but still have no heat. When I used to try to run the heat, I would end up with a puddle of coolant on the floor. I’m not sure if the coolant stopped leaking after I replaced the heater core, simply because there was already so much on the floor and I’m afraid to try it again since I just finally got the carpet dry. Either way though, still no heat. I’m thinking it’s either the blen door or vacuum line, but would like a second opinion. Thanks!

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The blend door actuator is about where the passengers left foot is. It has probably gone out, or isn't hooked up. 

 

Also, a heater core either leaks or it doesn't. It would leak any time there is pressure on the coolant system, it's not like older cars where there was a valve in the heater hose. It doesn't matter whether the system is on cold/hot or if the fan is on/off.

Edited by That Guy
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So a common failure is the small plastic piece between the blend door and door motor, look up heater treater. It’s a piece of steel that replaces it, simple to change. 
if that’s not it, I’d try a new ac/heat control panel. It’s cheaper and easier to get than a new blend door motor. 
 

or if you done any under the hood work or behind the dash stuff recently, check the vacuum lines. 
 

https://heatertreater.net/dodge-ram-95-02

Edited by Towrigdually
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48 minutes ago, Towrigdually said:

So a common failure is the small plastic piece between the blend door and door motor, look up heater treater. It’s a piece of steel that replaces it, simple to change. 
if that’s not it, I’d try a new ac/heat control panel. It’s cheaper and easier to get than a new blend door motor. 
 

or if you done any under the hood work or behind the dash stuff recently, check the vacuum lines. 
 

https://heatertreater.net/dodge-ram-95-02

I’m thinking that when I replaced the heater core I may have messed up a vacuum line. How do I check to see if I did?

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If you can pull a solid vacuum on all the settings, the lines are good. If you can cycle through all the vent configurations (defrost/feet/face/ect.) the lines are fine.

 

The actuator isn't vacuum powered, its electronic. I don't recall on these specifically, but you may be able to open it up and see if there are any burnt components or worn contacts, assuming that the little plastic piece that Towrigdually mentioned is in working order.

 

 

Edited by That Guy
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