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Climate control fan only runs on high.


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C_Hirchak
User

May 5, 2021, 9:39 AM

Post #1 of 36 (928 views)
Climate control fan only runs on high. Sign In

1994 Lincoln Town Car
4.6L V8

Hey, y'all. Long time.

I'm having trouble with my climate control, specifically the fan speed control. It only blows high. I had the climate control unit itself repaired and the repair guy told me to replace the Blower Motor Resitor. So i did, first with a Dorman, than with a motorcraft unit. It still only blows on high. It's getting hot here in Florida and I'm afraid yo run the a/c out of fear of shorting something out; like the chip that overheated due to a bad resistor in the first place. I checked the fuse even though if it were bad the fan wouldn't run to begin with. So what's my next move?

Thank you.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 5, 2021, 9:47 AM

Post #2 of 36 (926 views)
Re: Climate control fan only runs on high. Sign In

That's what I would have suggested, normally.
Not sure sport, own these basically and they will stay on high till temp inside knows it's cooled enough on anything request that's "auto" control.
Not sure of choices this could be you need to enable manual control of the switch for fan or maybe that switch isn't working stuck on forced high?
Another is if you block how it senses air temp you are confusing it. It's usually a tube carrying interior air from dash to low under dash,
T



C_Hirchak
User

May 5, 2021, 9:53 AM

Post #3 of 36 (924 views)
Re: Climate control fan only runs on high. Sign In

Whether automatic or manually adjusting the fan speed it only works on high.


Hammer Time
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May 5, 2021, 10:16 AM

Post #4 of 36 (916 views)
Re: Climate control fan only runs on high. Sign In

You say you replaced a blower resister. This car doesn't use a resister. It has a blower speed controller module although some parts stores may still call it a resister as it takes the place of the resister.

The Control head in the dash and the speed controller are the only two components that effect blower speed. If both were replaced, it only leaves the wiring connections in between but I'm thinking you didn't replace the correct part and the speed controller is a very common failure with these symptoms.

The speeds are controlled through the ground side of the circuit so the motor receives constant power. The speed controller is bypassed for high speed so that is why only that speed works.





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C_Hirchak
User

May 5, 2021, 10:35 AM

Post #5 of 36 (912 views)
Re: Climate control fan only runs on high. Sign In

The part that i used is a 19e624 out of a yh-1834 kit.


Hammer Time
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Hammer Time profile image

May 5, 2021, 10:41 AM

Post #6 of 36 (908 views)
Re: Climate control fan only runs on high. Sign In

Yes, that is the correct module. Are you saying you did not use the new pigtail? They package that for a reason. The originals overheat from the high current flow and build up resistance over time and that causes problems.



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C_Hirchak
User

May 5, 2021, 10:52 AM

Post #7 of 36 (904 views)
Re: Climate control fan only runs on high. Sign In

The connector was the same between the dorman and motorcraft, just a different gauge of wire. Theres still a dorman harness on there because the splicing job that i did might make it a really close call if i use the harness that came with the motorcraft part. Nobody else seems to have this problem with the dorman unit amd harness.

If the harness is in fact the culprit what is the likelihood that I've done damage to the cc unit or the module after 60 or so seconds of use?


Hammer Time
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May 5, 2021, 11:11 AM

Post #8 of 36 (895 views)
Re: Climate control fan only runs on high. Sign In

Are you sure it was wired correctly?

That's about the only possibility left here.

I tried to find a connector diagram for you but Alldata doesn't have one.



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C_Hirchak
User

May 5, 2021, 11:21 AM

Post #9 of 36 (891 views)
Re: Climate control fan only runs on high. Sign In

It is wired properly. I was able to confirm that since the motorcraft module came with a wiring diagram.


C_Hirchak
User

May 5, 2021, 11:27 AM

Post #10 of 36 (884 views)
Re: Climate control fan only runs on high. Sign In

Side question, what are the chances of breaking something at this point if i use the a/c while this problem persists, btw?


Hammer Time
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May 5, 2021, 11:29 AM

Post #11 of 36 (882 views)
Re: Climate control fan only runs on high. Sign In

Maybe you got a bad speed controller then.

Something had to go wrong here.



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C_Hirchak
User

May 5, 2021, 11:37 AM

Post #12 of 36 (878 views)
Re: Climate control fan only runs on high. Sign In

I don't know, the dorman and motorcraft were both new in box anx neither works


Hammer Time
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Hammer Time profile image

May 5, 2021, 11:41 AM

Post #13 of 36 (876 views)
Re: Climate control fan only runs on high. Sign In

Let's try this

1. Perform EATC On-Board Diagnostics. Record all error codes displayed during test.

2. If error codes appear during EATC On-Board Diagnostics, follow diagnosis procedures outlined for each code recorded.

3. If a condition exists but no error codes appear during the On-Board Diagnostics in Step 1, refer to Diagnosis When On-Board Diagnostics Indicates No Errors Found.
- The control assembly will detect electrical concerns occurring during the On-Board Diagnostics.
- Ensure that the engine is warm, at least 49°C (120°F) coolant temperature.
- To display the error codes for condition detection, initiate the On-Board Diagnostics by pushing OFF and FLOOR simultaneously and then AUTO within two seconds. The test may run as long as 20 seconds, during which time the display will be blank. If the display is blank for more than 20 seconds, go to EATC--When On-Board Diagnostics Indicates No Errors Found.
- The On-Board Diagnostics can be initiated at any time with the resulting error codes being displayed. Normal operation of the system stops when On-Board Diagnostics is activated. To exit the On-Board Diagnostics and restart the system, push the BLUE button. The On-Board Diagnostics should be deactivated before powering the system down. Refer to the Symptom Chart for an explanation of error codes.

NOTE: The in-vehicle temperature should be greater than 50°F (10°C) for all error codes shown to be valid.



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Tom Greenleaf
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May 5, 2021, 11:42 AM

Post #14 of 36 (874 views)
Re: Climate control fan only runs on high. Sign In

Hmmm? Quote you from top post "I had the climate control unit itself repaired and the repair guy told me to replace the Blower Motor Resitor."<
That suggests you or a tech had that all apart, tested it to find that wasn't it?
I'm learning about this other way it can fail NONE did that I knew of.
What can go wrong is relays. One marked A/C underhood probably isn't for fan. I'd swap it with another just anyway see if other item works choose carefully or new are cheap from Ford Dealers or were.
Somehow now back the control head if that repair didn't work why didn't same person just do more or didn't know?
Hammer said the fan speed is how much ground it gets so use a DVOM on you new part and see if it does lose ground if you ask for lower fan speed - bet it doesn't.
I feel your pain with screwed up A/C at least if it's cool you can or should just alter temp desired request if too cold with fan on high for now. Most if hot enough out want all they can get.
This may be back to control head you said was fixed and didn't work out?? IDK, I don't do those wasn't so sure then could be messed with or seek another used or new if possible?
If nothing else please tell me/us - the world what fixed it,


Tom


C_Hirchak
User

May 5, 2021, 11:56 AM

Post #15 of 36 (868 views)
Re: Climate control fan only runs on high. Sign In

I'm getting ready for work, I'll get back to you guys tomorrow.

Have a great day.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 5, 2021, 11:59 AM

Post #16 of 36 (868 views)
Re: Climate control fan only runs on high. Sign In

One more thing..............

The black wire at the speed controller, make sure that wire is grounded securely.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



C_Hirchak
User

May 6, 2021, 2:25 PM

Post #17 of 36 (825 views)
Re: Climate control fan only runs on high. Sign In

Test complete.
Error codes 02 and 03

I cant find error codes for my year, most are for 97 and beyond and all are three digits


Hammer Time
Ultimate Carjunky / Moderator
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May 6, 2021, 2:31 PM

Post #18 of 36 (821 views)
Re: Climate control fan only runs on high. Sign In

 02 (Code displayed during diagnostic procedures)

Possible Source(s):
- A/C air temperature control door damaged or inoperative.

Action(s) to Take:
- Refer to Pinpoint Test B. See: Heating and Air Conditioning > Pinpoint Tests > B: EATC Blend Door Actuator Functional Test

03 (Code displayed during diagnostic procedures)

Possible Source(s):
- Automatic temperature control sensor open or short.

While the temp control sensor could be related to automatic blower speed control, it should not prevent you from manually adjusting the blower speed so you are basically back to square one.

Did you check that ground on the black wire at the speed control module?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



C_Hirchak
User

May 6, 2021, 3:42 PM

Post #19 of 36 (811 views)
Re: Climate control fan only runs on high. Sign In

I didnt have time today. I had to remove my passenger seat, take out the motor for repair and bring it to a shop, and strip the top coat for refinishing. I'm refinishing my whole interior.

I'm gonna have to research how to check the wire and that's if theres anything on the web. If i follow that wire I'll eventually find it screwed to the body, yeah?


Hammer Time
Ultimate Carjunky / Moderator
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May 6, 2021, 3:47 PM

Post #20 of 36 (807 views)
Re: Climate control fan only runs on high. Sign In

If you have a test light, attach the wire end to the POSITIVE battery post and then use the probe to test the wire. It will light with ground. You can check the test light hookup by just touching the engine or body with it.



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C_Hirchak
User

May 6, 2021, 4:03 PM

Post #21 of 36 (803 views)
Re: Climate control fan only runs on high. Sign In

Ok, I'll buy a test light tomorrow. I'll have to expose the wire, correct? Theres a butt connector i can get at the copper wire if needed.


Hammer Time
Ultimate Carjunky / Moderator
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May 6, 2021, 4:11 PM

Post #22 of 36 (799 views)
Re: Climate control fan only runs on high. Sign In

No, the light has a wire with a clip at the end that you just clip onto the batter terminal and the light has a sharp probe that you can poke through the wire insulation or unplug it and contact it through the plug end.





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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



C_Hirchak
User

May 6, 2021, 4:20 PM

Post #23 of 36 (795 views)
Re: Climate control fan only runs on high. Sign In

Oh, duh! I can just unplug it. I'll do that tomorrow.


Tom Greenleaf
Ultimate Carjunky / Moderator
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May 6, 2021, 4:26 PM

Post #24 of 36 (793 views)
Re: Climate control fan only runs on high. Sign In

? A know wire that should always be ground in dash? Don't be so sure it bolts to body as dash metal should already. I'd use the smallest pin and poke known wire (no guessing) and back feed a plain test light show it's in fact ground. Seal even that with either liquid electrical tape on a Q-Tip or interior stuff maybe black nail polish! Yes - if you have a Dollar Tree store dang stuff lasts, flexible a bit in all the assorted colors or just clear.
Sounds wrong but I used it for touch up paint and it outdoes the crap sold as touch up paint!


T


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 6, 2021, 4:43 PM

Post #25 of 36 (788 views)
Re: Climate control fan only runs on high. Sign In

Don't confuse him Tom. We are working in the engine compartment on this.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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