No heat through the heater

[riverside]

I am getting no heat inside my 92 xj, any reason why? All hoses seem to be hooked up properly.

 

[4x4JeePmaNthINg]

are both heater hoses hot?

 

[RCP Phx]

The bypass valve might be dead. Check by feeling for heat/flow when operating the controls.

 

[sdspearo]

Check for a vacuum leak. Start by pulling the vacuum line from the heater control valve and plugging it with your finger...you should feel vacuum.