97 stuck on defrost vacumn lines all good...what next ?
#1
Registered User
Thread Starter
97 stuck on defrost vacumn lines all good...what next ?
What's next to check all lines are good & vac supply to firewall checks out ?
This truck is in mint shape in & out & nothing dash wise has ever been apart.
This truck is in mint shape in & out & nothing dash wise has ever been apart.
#2
Administrator
Here is what I recently had go wrong.........................
https://www.dieseltruckresource.com/...-issue-318758/
#3
Registered User
If nothing works including the recirc door then it has to be there is no vacuum getting to the rotary mode control switch, there is a small black vacuum line that passes through the firewall by the heater hoses, if you have vacuum there then it's a vacuum problem inside.
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