Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hello and welcome to just answer. Is the vacuum line that comes out of the firewall connected to the intake manifold? And if so, does it TEE off and go to the cruise control servo?
Also, if you do have cruise control. inspect that vacuum line closely at the servo. I have seen issues where battery acid can eat through it.
Ok, do you have good vacuum at the HVAC control head?
Ok, then that narrows it down to 1 a failed HVAC control head, or 2 one of the vacuum actuators has a hole in it'd diaphgram. Get a hand held vacuum pump and test each vacuum actuator. They should all hold vacuum. If not, then replace the actuator. If they all test good, then replace the control head.
Hello, did you see my last reply?
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Hello, I have not heard back from you in a while. How is it going with the truck?