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Air conditioner blows hot

Tiny
EVAL
  • MEMBER
  • 2004 FORD THUNDERBIRD
  • V8
  • FWD
  • AUTOMATIC
Troubleshoot DTC codes B1265, B2798, B2799. Air conditioner is blowing hot air.
Saturday, November 20th, 2010 AT 6:21 PM

42 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Is the AC compressor cycling?
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Saturday, November 20th, 2010 AT 6:27 PM
Tiny
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Yes it is.
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Saturday, November 20th, 2010 AT 6:52 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Okay, if it is cycling, the system is pressurized and low on Freon.

Here is a couple of guides that will help you get the problem fixed:

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

and

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Then clear the codes.

https://www.2carpros.com/articles/check-engine-light-clear-codes

Please let us know what you find.

Cheers
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-1
Saturday, November 20th, 2010 AT 8:53 PM
Tiny
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Okay, I will check that. Can you tell me how to correct those diagnostic codes?
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Saturday, November 20th, 2010 AT 9:58 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
You can try disconnecting the battery to see if that resets them. If not, it will need done by a scanner.
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Saturday, November 20th, 2010 AT 10:10 PM
Tiny
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The diagnostic scanner when ran gave me those codes, but did not tell me how to correct the problems. Does that make sense?
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Saturday, November 20th, 2010 AT 10:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
B1265 - Cold air bypass door actuator circuit failure.

B2798 - Driver coolant control valve circuit short to ground.

B2799 - Passenger coolant control valve open circuit.

Since you have heat all the time, the B2799 I feel is the problem. Here is a test:

1) Key in off position.
2) Disconnect coolant control valve.
3) Key in on position.
4) Measure the resistance between ground and coolant control valve plug.

5) Is the voltage greater than ten volts?

It sounds like you have a blend door actuator for the fresh air door and a coolant control valve that is out and needs to be replaced.

Here is a guide to help you see whats goes on when doing the repair:

https://www.2carpros.com/articles/replace-blend-door-motor

Below are some diagrams to show you on your car.

Let me know.
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Monday, November 22nd, 2010 AT 2:11 AM
Tiny
EVAL
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I fixed it! Thanks for all of your help the diagrams really helped. You guys are the best!
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Monday, November 22nd, 2010 AT 5:05 PM
Tiny
JACOBANDNICKOLAS
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Nice work, we are here to help. Please use 2CarPros anytime.

Cheers
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Monday, November 22nd, 2010 AT 7:43 PM
Tiny
RAUL MERCADAL
  • MEMBER
  • 1 POST
  • 2004 FORD THUNDERBIRD
  • 3.9L
  • V8
  • RWD
  • AUTOMATIC
  • 43,000 MILES
Trying to find out the location of the A/C port (low and high pressure).
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Tuesday, October 3rd, 2017 AT 7:35 PM (Merged)
Tiny
CAPITANELLI
  • MEMBER
  • 1 POST
  • 2004 FORD THUNDERBIRD
  • V8
  • RWD
  • AUTOMATIC
  • 7,600 MILES
Leaked oil in garage on floor. How do I fix it? A/C not working blowing hot air.
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Tuesday, October 3rd, 2017 AT 7:35 PM (Merged)
Tiny
KLLIMBRICK
  • MEMBER
  • 3 POSTS
  • 2005 FORD THUNDERBIRD
  • V8
  • 2WD
  • AUTOMATIC
  • 44,000 MILES
Air conditioning.
No matter the setting, from sixty to ninety degrees, the air blows very hot and I cannot adjust it. It appears the electronic heater control valves, there are two, are stuck full open. There are no trouble codes in the computer.

Is there a way to reset the heater valves or am I stuck buying a $160.00 set of new control valves.

Thanking you in advance,
Ken L.
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Tuesday, October 3rd, 2017 AT 7:35 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Hello,

It sounds like you have a blend door actuator that is not working and needs to be replaced.

Here is a guide to give you an idea on what you are in for when doing the job:

https://www.2carpros.com/articles/replace-blend-door-motor

Below are some diagrams on what it will be like on your car. This shown all of the actuators but the one you need is the mode actuator.

Please let us know what happens.

Cheers, Ken

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Tuesday, October 3rd, 2017 AT 7:35 PM (Merged)
Tiny
DODGERLINDA
  • MEMBER
  • 1 POST
  • 2003 FORD THUNDERBIRD
V8 Automatic 50,000 miles.

Air conditioner is blowing hot air. Bought 50/50 coolant, and also bought Freon kit. My car does not have a manual available to purchase. So how do I replace the Freon?
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Tuesday, October 3rd, 2017 AT 7:35 PM (Merged)
Tiny
FLEXY5
  • MECHANIC
  • 512 POSTS
First, we need to determine if the compressor is running. If it is not, have the system tested. I know you said you bought a kit, but it may save you money if you have it tested. It would be a shame to try to fill it only to find that you have a hole in a hose somewhere. If you are very specific and tell them you only want it checked and not serviced, it should not cost you much. If the system is low, then you can add the Freon. If there is none in it at all, we need to find out why. The other option is that it is working fine, but the blend door that regulates the temperature in the cabin may not be working properly. I know it sounds like a lot to do, but it may save you money and a big headache in the long run. Check this and post back. Then, if it needs it, we can fill it.
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Tuesday, October 3rd, 2017 AT 7:36 PM (Merged)
Tiny
HENRYHER
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I had a similar problem with my 2002 Thunderbird. The air would work fine for a while then it would start blowing hot, and I mean hot, air out the vents. We brought it to the Ford dealer several times but they kept saying they could not find anything wrong. I finally did a u-turn when it started doing it and made the technician come out while the car was still on. He noticed the hot air and could not make it cool down. It turned out to be two sensors blown. One behind the dash and the other behind the motor against the firewall. They kept it for three days and gave me a loaner. It has not done it since. I was glad to have the extended warranty because the total was over $800.00.
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Tuesday, October 3rd, 2017 AT 7:36 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,323 POSTS
Great addition to this thread! Please feel free to help out whenever you are on the site. :)

Cheers, Ken
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Wednesday, October 4th, 2017 AT 3:20 PM
Tiny
ROBERT96THUNDERBIRD
  • MEMBER
  • 6 POSTS
  • 1996 FORD THUNDERBIRD
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 142,000 MILES
So heres what happened and what I have done to attempt a fix with no luck.

I was driving and the AC was running fine blowing cold air no problems.
At one point I attempted to change AC setting from Max AC to regular AC on the manual control.
When I changed the knob setting, instantly the AC cutoff. No fan. No anything !

So I began to check the only fuse under the dash I am aware of and works fine. Has continuity on meter.
I then checked the fuse block under hood and nothing there was blown. Again meter showed continuity.
I then tested fan by jumping with battery. Fan spun good.
I replaced the heater resistor as well as the AC switch at the panel. Still nothing !

So my question what else could it be?
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Tuesday, July 9th, 2019 AT 12:19 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You need to test for power and ground arriving at the blower to see which one is missing and that will determine where we go from there.
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Tuesday, July 9th, 2019 AT 12:19 PM (Merged)
Tiny
ROBERT96THUNDERBIRD
  • MEMBER
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Put meter on the plug going into the fan?
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Tuesday, July 9th, 2019 AT 12:19 PM (Merged)

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