Heater system not working/heater value system /switches control working, but no heat, put theorstat in and no heat still/

Question edited for clarity and toss in some CAPS.
Question moved to model category.

Check the connections to the module and the element. There is help in the forums and videos as well, although not all on the Ford Flex, the idea is the same.

Seat heater doesn't work - Ford Flex Forum

FordFlex.net https://www.fordflex.net > ... > Recalls and TSBs
Apr 19, 2012 - The driver side seat heater for my 2009 Flex stopped working. The dealer says that it is the heating element and is $500 to replace and of ...

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Trying to test my 2009 Ford flex driver side heated seat

JustAnswer https://www.justanswer.com > Ford Repair
Jan 24, 2019 - If the resistance reading of step 2 shows proper value, perform an amperage draw test of the heater elements by applying power to the YE/BU wire ...

1 answer · Top answer: Yes but it would need to be a advanced level one... a basic engine reader only gains access ...
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Ford Flex Seat Heater Control Module - 9U5Z14C724A

Lakeland Ford Parts https://parts.lakelandford.com > Ford__Flex > Seat-He...
Buy Ford Flex Seat Heater Control Module. Seat Heater Control Module - Repair or Replace Has your Seats, Left, CUSHION - OEM Ford Part # 9U5Z14C724A (9U5Z- ...
Rating: 4.8 · ‎3,386 reviews‎

Drivers side seat heater repair and costs - Page 2

My Ford Freestyle https://www.myfordfreestyle.com > forums > viewtopic
Dec 11, 2009 - I checked all connections under the seat. The bottom pad has a 4 wire pin connector and the back has a 3 wire pin connector.

..

You have probably burnt up the element as it is a 17 year old seat now. The elements are replaceable, but the labor is pretty spendy. To test it you will need a multimeter to check for continuity across the connectors that go to the seat heating elements and check for voltage at the car side of the connector. If you have 12v to one side of the connector and continuity to ground at the other side, and do not have continuity to the seat side between the connectors, you know it is a bad element.

Turn the ignition switch to the ON position.
Turn the passenger climate control to full hot.
Measure the voltage at terminal D13 of the heater and A/C programmer.
Is the voltage measured equal to the specified value?
12 V
YES - Go to Step 2
NO - Go to Step 8
Turn the passenger temperature control to full cold.
Measure the voltage at terminal D13 of the heater and A/C programmer. Refer to Measuring Voltage in Wiring Systems.
Is the voltage equal to the specified value?
0 V
YES - Go to Step 3
NO - Go to Step 8
3
Press and hold down the passenger temperature control.
Measure the voltage at terminal C16 of the heater and A/C programmer. Refer to Measuring Voltage in Wiring Systems.
Is the voltage equal to the specified value?
0 V
YES - Go to Step 4
NO - Go to Step 9
4
Release the passenger temperature control.
Measure the voltage at terminal C16 of the heater and A/C programmer. Refer to Measuring Voltage in Wiring Systems.
Is the voltage equal to the specified value?
12 V
YES - Go to Step 5
NO - Go to Step 9
5
Turn off the passenger temperature control.
Measure the voltage at terminal D10 of the heater and A/C programmer. Refer to Measuring Voltage in Wiring Systems.
Is the voltage equal to the specified value?
12 V
YES - Go to Step 6
NO - Go to Step 10
6
Turn on the passenger temperature control.
Measure the voltage at terminal D10 of the heater and A/C programmer. Refer to Measuring Voltage in Wiring Systems.
Is the voltage measured less to the specified value?
12 V
YES - Go to Step 7
NO - Go to Step 10
7
Inspect the terminal contact at the heater and A/C programmer.
If the contact is OK, replace the heater and A/C programmer. Refer to Programmer Replacement .
Did you complete the repair?
--
System OK
--
8
Test CKT 831 (DK BLU/WHT) for an open or a short.
If the circuit is OK, replace the passenger temperature control. Refer to Control Assembly Replacement - Passenger .
Did you complete the repair?
--
System OK
--
9
Test CKT 1336 (DK BLU) for an open or a short.
If the circuit is OK, replace the passenger temperature control. Refer to Control Assembly Replacement - Passenger .
Did you complete the repair?
--
System OK
--
10
Inspect CKT 1370 (PPL) for an open or a short.
If the circuit is OK, replace the passenger temperature control. Refer to Control Assembly Replacement - Passenger .
Did you complete the repair?

DTC B1340 Air Mix Door #1 Movement Problem !
The heater and A/C programmer supplies voltage to an internal motor that drives the air mix door. The heater and A/C programmer monitors the air mix door position feedback from a sensor on the motor. If the air mix door is requested to move but the feedback voltage does not change, the heater and A/C programmer will store DTC B1340. If the air mix door feedback indicates that the feedback is near the hot or the cold extreme, the DTC will not set. Evaluate the operation of the air mix door through self diagnostics as described in the test description.
Test Description
Perform the Diagnostic System Check before continuing with the diagnosis of this DTC.
A Scan Tool allows for the direct control of the air mix door by observing the following conditions:
• The air mix door position feedback value
• The value`s difference from the air mix door commanded position value
These readings indicate a fault internal to the heater and A/C programmer in the air mix door sensor feedback.

Did you perform the Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check
2
With the engine running, connect a Scan Tool .
Turn the dual zone to OFF (passenger temperature offset at 0 or OFF).
Exercise the suspect actuator using the temperature control on the control assembly.
Is the door being commanded (COM) to the proper high and low values?
COM High 100 %
COM Low 0 %
Go to Step 3
Go to Step 4

If you are unfamilier with this , i suggest you take it to a ASE certified repair shop or the dealer .

Do you have Manual Climate Control System or Dual Automatic Temperature Control System ?
The temperature control switch:

• is a potentiometer that outputs a variable voltage to the temperature blend door actuator to set the position of the temperature blend door.
• initiates closing of the heater control valve. When set to full COOL, a lever on the temperature blend door pivot shaft depresses the pintle of the heater control valve vacuum switch. The heater control valve vacuum switch then applies vacuum to the heater control valve, closing off engine coolant flow to the heater core.
• is serviced only with the climate control assembly.

You may have disturbed something when changing the actuator , the vacuum switch o vacuum hose .

service the engine.. change oil ,filter plugs etc

did you clear the faults before each read
Diagnose Buick 3800 Engine
unusual code that

P0125 is the OBD-II generic code for the engine computer, or Engine Control Module (ECM), not detecting enough heat in the cooling system before the fuel management system can take control. The ECM has a predetermined value after you start your vehicle to expect a certain coolant temperature

P0125 OBD II Trouble Code Insufficient Coolant Temperature for Closed Loop...

ecm runs the engine cooling fans

3800V6 engine over heating and heater produces cold air
try these

EGR vale not working
overheating
inlet manifold gasket leaking
water pump fins corroded
soft radiator hoses
try a new radiator cap

internal heating
heater control tap stuck
directional actuator flaps stuck

that happened to me the heater core went out ive read alot of different things about 03 galants most of them have the same problem it started with a grinding noise turning the temp contol, its actually the heater control motor value it causes the heater core to go out

P0429 Description The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).



A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.



When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.
Possible causes - Catalyst Heater Control harness is open or shorted
- Catalyst Heater Control circuit poor electrical connection
- Faulty Powertrain Control Module

If the Temperature gauge is moving less than before, its your Thermostat. If the Engine Temperature is the same, then your heat control valve is not opening or a duct flap(called a door) is not moving under the dash.

Having a Bad thermostat will affect how controls on the engine work and when they work.

Put your hand on the heater hoses as close to the fire wall as possible find out if both hoses are hot.Do this when the vehicle is cold allow car to heat up with heater open and running.If both equaly hot then heater core at fault.If different check water supply to cold hose.