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A/c cmpressor turns on when set on heat 2003 f150 already…

A/c cmpressor turns on...

A/c cmpressor turns on when set on heat 2003 f150 already replacd blend door actuator

Mechanic's Assistant: Have you checked the coolant level? Has there been any leaking from the hoses?

No leaks

Mechanic's Assistant: Are you fixing your F150 yourself? What have you tried so far?

Yes i replaced blend door actuator

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Answered in 2 minutes by:
3/7/2018
A. Penland
A. Penland, Ford Senior Master Technician, ASE
Category: Ford
Satisfied Customers: 6,951
Experience: ASE Master Certified, ASE Advanced Gasoline Engine Performance
Verified

Are you setting the heat setting when you switch it to the defroster setting?
Are you getting heat from the vents when you switch the temperature setting to heat?

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Customer reply replied 4 months ago
compressor turns on when set def heater
Michael
Michael, Ford Senior Master Technician
Category: Ford
Satisfied Customers: 670
Experience: Ford Senior Master Tech w/22 yrs exp.
Verified

Hello, my name is Michael. I will be assisting you today. Give me a moment to review your question and get right back with you. Do you have automatic or manual climate control?

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Customer reply replied 4 months ago
manual

Per the Ford workshop manual the air compressor will engage in the following modes:

  • Max
  • A/C
  • Panel/Floor
  • Floor/Defrost
  • Defrost

Is your system operating in any mode other than these?

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Customer reply replied 4 months ago
compressor turns on when set to heat i have to disconect compressor in order to get hot air

I believe the problem isn't with the A/C compressor coming on. It is normal to come on even when the heat is set. It's done to remove the humidity from the air. The heat from the heating system should overcome the cooling and still provide you with warm air.

When you turn the temperature knob from cool to warm and back to cool, do you feel any temperature change?

Is your coolant clean and full?

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Customer reply replied 4 months ago
is 70*when set on heat/coolant is full&clean

When you get 70 degrees on heat. Does the temperature drop when it's switched to cold?

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Customer reply replied 4 months ago
no
Customer reply replied 4 months ago
temp will rise if i disconect compressor

When you have the heat on, and the a/c compressor comes on you should have enough heat to over come the cooling of the a/c compressor. Disconnecting the compressor will allow the air to warm some because the cooling stops. Your issue is one of three possibilities.

  1. Your coolant isn't warm enough. The thermostat could be stuck open. If this is the case the coolant isn't warm enough to overcome the a/c cooling.
  2. The heater core is partially clogged. In this case some heating of the air is done, but the heater core does not have full coolant circulation and this causes insufficient heat transfer from the coolant to the air.
  3. Something has failed in the blend door system.

When you replaced the blend door actuator, were you able to inspect the door and make sure it moves freely?

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Customer reply replied 4 months ago
thank you for ur help im gona chk door &t=stat .

You're welcome. If I can be of any further assistance don't hesitate to ask. If not, please rate my service. If for any reason you feel you cannot rate my service five stars please let me know.

Michael
Michael, Ford Senior Master Technician
Category: Ford
Satisfied Customers: 670
Experience: Ford Senior Master Tech w/22 yrs exp.
Verified
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