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NO REAR HEAT ON MY 12' E350. BLEND DOORALWAYS HAS VACUUM SO…

Customer Question
NO REAR HEAT ON...

NO REAR HEAT ON MY 12' E350. BLEND DOORALWAYS HAS VACUUM SO IT WONT SWITCH. ORIGINALY I REPLACE THE DOOR AND ACTUATOR BECAUSE THEDOOR WAS BROKEN.

Mechanic's Assistant: Have you checked the coolant level? Have you checked to make sure the thermostat is working?

IM A MCHANIS WITH 16 YEARS EXP. ALL INT CHECKS HAVE BEEN MADE. FRONT HEAT AND AC WORK GREAT. REAR STAYS ON AC UNTILL I DISCONNECT THE LT BLUE VACUUM HOSE. THEN THE DOOR DROPS OPEN AND SWITCHES TO HEAT. RECONNECT THE HOSE AND THE ACTUATOR CLOSES THE DOOR AND I HAVE AC. I THOUGHT TO REPLACE THE TEMP SELECTER AD MODE SWITCH BUT THAT DIDNT CHANGE A THING.

Mechanic's Assistant: Are you fixing your E350 yourself? What have you tried so far?

YES. PLEASE READ THE ABOVE TEXT.

Submitted: 3 months ago.Category: Ford
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Answered in 28 minutes by:
5/25/2018
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 54,072
Experience: 16 years experience
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When the function selector switch up front is in the DEFROST, FLOOR or MIX position, do you get rear heat from the floor vents?

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Customer reply replied 3 months ago
HELLO IM MATT
Customer reply replied 3 months ago
NO
Customer reply replied 3 months ago
THE REAR ACTUATOR JUST STAYS ON A/C, IT ALWAYS HAS VACUUM NO MATTER WHAT POSITION THE MODE SWITCH IS IN OR THE TEMP SWITCH IS IN.
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

At the front HVAC system change modes from MAX, to defrost and all settings in between. Does each blow out the air up front in the correct place only per the selection?

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Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

Remove the front HVAC control and remove the BLUE vacuum line and see if you get these results while the engine is running.

max.normal,vent, vacuum.

off, mix, floor, defrost, no vacuum

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Customer reply replied 3 months ago
I BELIEVE THAT IF I REMOVE THE BLUE TUBE FROM THE RUBBER, I WILL NOT BE ABLE TO GET IT BAKE INTO IT AND IT WOUD NEED TO BE REPLACED. ALSO, I CANT PINCH OFF THE TUBE. WHAT SHULD I DO?
Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

You could follow the line to the panel floor door actuator and try to disconnect it there to test or at an inline splice, the problem is to fully access this actuator, dash removal is needed.

vacuum diagram https://www.dropbox.com/s/4842c9tpjqc5yg0/12V1.pdf?dl=0

How the vacuum works https://www.dropbox.com/s/cdcp6hlui3hszxk/12V2.pdf?dl=0

How the auxiliary unit works https://www.dropbox.com/s/ttbixho4zau01ly/12V3.png?dl=0

What the actuator looks like https://www.dropbox.com/s/z65s0wnqs0jkala/12V4.pdf?dl=0

The issue is the front climate control based on your rear vacuum tests, I was just trying to prove it.

You now will see a rating scale a row of yellow stars from bad to excellent, because I have posted my 1st full/partial answer. When you rate I get a portion of the deposit you made, no rating means you still paid, but I earn nothing. My goal is understanding your question, and addressing it in full detail. In return, receiving a 5-star rating. Rating does not close the post or stop the conversation. Please keep in contact and reply as much as needed. Thanks, Chris

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Ford Mechanic: Chris (aka- Moose), Technician replied 3 months ago

Hello, Chris here again,

I am checking in to make sure you got everything you expected from my INFO REQUEST / ANSWER in return for the fees you have already paid. I want those fees to benefit you and me. If any part of my response is unclear, please let me know. It’s my goal to deliver excellent 5-star service you're pleased with, so if I've done that, please don't forget to give me a 5-star rating.

Thanks, Chris

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