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Check for vacuum leaks.
Check for a vacuum leak either under dash or under the hood Check the operation of the vacuum actuated motors under dash Check the selector switch
How to check for leaks on vacuum hoses for a dodge diesel
Check the CAD, the diaphragm may be toast. just replace.
Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch Defrost is the default setting for this system
Make sure there is vacuum going into the passanger compartment. There should be a vacuum line from the intake manifold goung into the cab. GoodluckJoe
in the dash but check the resistor 1st the blow e.z. it is in engin comp. passinger side on heater core lines it looks just like a water heater fuse
dodge 2001 Dakota brake lights won't burn Check the fuses. If the fuses are okay check the brake light switch.
There is no heater control valve on this generation of dodges like there used to be... the water flows constantly through the heater valve.. the only control is a trap door that allows cab air to be run through the heater core and is controlled by a vacuum solenoid in the heater box.. the temp control is also vacuum operated but be sure to check the vacuum supply line coming in from the engine.... it has a check valve in it that can be keeping the controls from getting enough vacuum to operate properly.. if you don't have a mighty vac just get one of those packs of barbed vacuum fittings from your local shucks and bypass the valve temporarily and see if you get heat... hope this helps
you have a vacume leak probbly going to the heater control There is a check valve that prevents the loss of vacuum to the heater controls. This check valve goes bad. Then, as you accelerate, the vac. in your engine drops and along with it, the vac to the heater controls drops (is less). To fix this, locate the check valve and replace it. Follow the vacuum line from your firewall (where it goes through the fire wall) back to the check valve. This check valve may be located between the engine and a vacuum reserve tank. The heater controls may be using the vacuum from the reserve tank. In any case, find the little check valve in the vacuum lines and replace it. You will see a remarkable change in the heater controls. I hope I explained this well enough. See you Later, Check your intake gasket if it is leaking at all it will cause it.
Trouble code P0155 means: O2 Heater Circuit (Bank 2, Sensor 1)
Have you used any stop leak in rad.? If you have pull off heater hoses and back flush heater core. Also check hot water control valve for heater.