Just purchased this 2011 Ranger 4.0L 4x2 and was doing a cooling service and noticed there are no vacuum lines hooked to heater control valve. Cannot find where vacuum source is or where vacuum lines go.

Any help appreciated and pictures of where source vacuum comes from and how lines are routed would be extremely helpful.

See attached pictures:

Vacuum pod with no lines attached

Vacuum pod lines appear to be connected properly.

 

Checked a a junk yard and found automatic transmission has a vacuum line and manual does not but appears Ford uses the same valve regardless.

 

Welcome to the Forum

1995 and up Rangers will have the heater bypass valve, manual or automatic, if no Factory AC it may not be connected but most Rangers had AC after 2000 or so

It uses a Grey vacuum line, hard plastic line so looks like a wire
It comes from under the Blower/AC box in engine bay, so it comes from the firewall, its controlled by the Climate control panel in the dash

Look in the lower passenger side corner between inner fender and firewall, there will be a Black and a Grey vacuum line coming out of the firewall
Black line runs along passenger side frame rail to front of engine bay and to the Vacuum Reservoir "ball"
Grey line runs up to the heater bypass valve

This Grey line only has vacuum present when MAX AC is selected or OFF on the control in the cab
It will never be a "vacuum leak" as far as the engine system is concerned

In the cab under the glove box, up high in the corner are where these 2 vacuum lines come out into engine bay, seen here: https://imgur.com/AHlTteI
Inside the cab the bypass line is White, it changes to grey at this connector

 

What could be the cause of this? I replaced this part and truck will not start. I am thinking either the thermostat is stuck in the closed position or the ERG valve needs to be replaced. Any insight is appreciated. Thanks!

 

Which part?
Are you saying the heater control valve melted...into a blob of plastic? A picture or two would sure help.
Where did you source your replacement heater control valve and how much did you pay?

A stuck thermostat won't prevent an engine from starting unless the engine was burned up / seized the previous time it was run.
Also, just to be clear, your engine cranks but won't catch (start)? Right?
f that's the case, make sure you didn't inadvertently disconnect something or break something fragile, such as a brittle PCV line (causing a large vacuum leak).

EGR valves exist to introduce a small bit of exhaust into the intake air stream in order to displace some fresh air resulting in lowering combustion temperatures thus reducing NOx emissions.
A faulty EGR valve wouldn't melt your heater control valve.

So, in addition to replacing your melted HCV and inspecting for disconnections and breakage, try the 50/50 test to start your engine.