Ford truck a/c air blows out defrost only - cold air so not compressor

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  #1  
Old 08-28-10, 02:04 PM
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Ford truck a/c air blows out defrost only - cold air so not compressor

Hello - My husband's F250 4X4 diesel truck has a problem with the vacuum system we think? Not sure exactly what is going on.

Vehicle: 2001 F250 4X4, short bed, quad cab truck, with 7.3 liter diesel engine. Has 93,000 miles on it. Orginial owner. Never been off road with it.

Turning on the air conditioner inside the truck it goes to the default which is the window vents and does not come out any other vents. It does blow cold air. Replaced the vacuum pump and still have the same problem.

This is a manual air conditioner with the knobs and basic controller. Where should we look next?

Could it be a leak in one of the the vacuum lines? or is there a way to check the controller itself in the vehicle?

Are we completely off base - and someone know if it is something else we should check?

It is extremely too hot to have cool air coming out the top of the dash to the defroster - it is 100 degrees here -
Thanks all -
 
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  #2  
Old 08-28-10, 04:12 PM
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You need to find otu for sure, how your venting is controlled, IMO. IF it is really manual, then the blender door knob or slide control may not be no longer opening to the panel vents. If vacuum, then it could be in some supply line. I had that in my car when a brittle plastic vacuum tube broke that was connected to the brake booster (on my Dodge) and that caused the default like you have. (I found it and fixed it myself.)
 
  #3  
Old 08-28-10, 04:23 PM
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As said, it could be mechanical, sort of like how the brakes work from the handlebars on a bike. A wire going through a cable.

Or vacuum operated.

I poked around a little on the internet and saw that some Ford vehicles have an electrically controlled actuator. There was no computer involved.

But lately many vehicles have computer module controlled A/C and electronic actuators. Actuators move little doors inside the vents to make the air go one way or another.

If there is a computer control involved with this, then you can try a "reboot"...

Remove a battery terminal for 10 minutes, then reconnect.
Turn ignition switch to on, but don't start.
Wait 1 minute.
DO NOT touch any buttons in the vehicle during this minute.
Then start vehicle and let idle for 5 minutes.
Drive above 45 mph as soon as possible.

This "reboots" all the computers in the vehicle including the A/C which then "resynchronizes" the actuator doors during the power-up.

This also reboots the engine computer and the idle and driving above 45 mph helps it to "regain" its operating memory.

If this does not work, you would need a Ford Factory Service Manual set which would have complete troubleshooting instructions for this problem as well as complete part replacement procedures. Order from helminc.com or a Ford dealer.

You would also need to know how to use a multimeter along with the instructions in the manual. How to use a multimeter...
how to use a multimeter on a car - Google Search
 
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Old 08-28-10, 05:03 PM
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So ecman I agree with you about finding out how the venting is controlled. How do I find out that information?
 
  #5  
Old 08-28-10, 05:10 PM
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2001 F250 7.3 liter diesel truck Ford - electric vauum pump - a/c blowing defros

so I know the vacuum pump is electrial and I know the a/c is blowing only to the defrost setting as a default - but how do I know more about the truck?

replaced the vacuum pump with a new one - and that was not the problem at all.

put the old pump back in and then the a/c worked fine - and then we stopped somewhere and about 30 minutes later we got back in the truck and it no longer had the air blowing out the vents, but was back on the window shield.

So I hope that helps with info about what it could be. Like I said the vacuum pump was replaced, and it did not work with a new one, and we put the old one back and it did work. Then we shut off engine during shopping, and got back in and it didn't work - went back to the defrost in the window.


This is a 2001 FORD F250 - it is nine years old - so hopefully I can get some responses for an older vehicle - like this one
 
  #6  
Old 08-29-10, 08:11 AM
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Rear Heat & A/C not working on 99" olds.minivan

The heat and a/c both work fine in the front half of my 99 oldsmobile silhouette minivan.The rear half will not blow anything hot or cold.What could it be?
 
  #7  
Old 08-29-10, 09:17 AM
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SHARNY- look at the vac hoses at the ft 4x4 hubs( if it has the auto hub system)
 
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Old 08-29-10, 12:02 PM
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Looked at that today newtofta - and one of them is crumbling in as I put my fingers around it. Good chance that may be the problem - or if not they need changing anyway. I can see where to remove them in the upper wheel base, but have not crawled under the truck to see where I have to remove it there. Going to replace these regardless if the problem because of their condition - and just front two wheels - and maybe that is the problem - would be great - hope it isn't that hard to do - the heat here is ridiculous - and have to wait on the time of day to work on it.

Thank you for that info and it was definitely something I didn't think about -
 
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Old 08-30-10, 01:00 PM
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Typically when a vacume leak is encountered most mfr's have it setup to default to defroster for safety reasons (icey windshields in the winter). Had the same thing happen to me on my 2000 F250. Vacume leak was at the auto hub.
 
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Old 09-01-10, 12:53 PM
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update

okay - we changed the hoses to the hubs on both sides - $6.00 total spent - did not fix the problem. They needed to be done anyway and thanks for that info - could have been problem in about six months -

Took to dealer today. They called and said "pump was out", and we said - ahhhhhhhh - wait a minute - we replaced the pump and it is not the problem. We even put the old pump back in and felt it running - and so guy went to talk to his Ford Mechanic and called back"

He said then that it must be the controllor - will what else ?? We thought the same thing. We didn't know how to test to see if that was the problem or not. That is why we went to a dealer that we have used in the past. So they are replacing that now and we shall see if it works.

I thought the mechanics at the dealerships were trained for the cars at the dealership and have those manuals ~ and they could diagnose it correctly and do it when all else fails trying to do it yourself -

well I used to think that -

This one has stumped us and to have Ford think the same thing - I just hope they are right with the controller - I will update this thread for those that could/would/may have this problem.

F250 Powerstroke diesel 4X4 shortbed - 2001 Diesel 7.3 liter truck -
 

Last edited by skarney; 09-01-10 at 12:55 PM. Reason: correct the year of the truck - it is a 2001 - approx 100K miles
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Old 09-01-10, 04:19 PM
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Let's hope they fix it soon before the cost gets too high.

Originally Posted by skarney View Post
I thought the mechanics at the dealerships were trained for the cars at the dealership and have those manuals ~ and they could diagnose it correctly and do it when all else fails trying to do it yourself -

well I used to think that -
We all wish trained pros were like gods and had all the answers, right away. Doctors are trained in the human body, yet some people have to go see like 5 doctors before one gets it right. We are human, I guess.
 
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Old 09-01-10, 04:40 PM
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Originally Posted by ecman51` View Post
Let's hope they fix it soon before the cost gets too high.



We all wish trained pros were like gods and had all the answers, right away. Doctors are trained in the human body, yet some people have to go see like 5 doctors before one gets it right. We are human, I guess.

No I don't think of them Gods. I only think they know the product, have the tools, and software, and experience or able to ask a manger the problem. That is what I think of a dealership mechanic. Not a regular mechanic - but a dealership mechanic for specific vehicles.

Doctors - they are "practicing" medicine - they never said they knew what they were doing - so they practice what they learned. Therefore, a Practioner. When I see a specialist and pay more then I hope they know what they are doing and not "practicing" on me since they have worked the problems and machines over and over.

So my analogy is that a specialist in medical field and the dealership mechanics are the specialist - yet we are all human -

Truck is fixed. Home and finished.
 
  #13  
Old 09-01-10, 04:46 PM
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It was the 4X4 actuaitor. It is an electronic control for activating the vacuum to the front hubs. They replaced it.
 
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Old 09-01-10, 05:38 PM
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So Boater was at least on the right track. Glad you got it. I've heard that spiel about doctors "practicing" medicine before.
 
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Old 09-02-10, 04:10 PM
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Talking

Thank you ALL for good tips, suggestions, and help. All were good tips and we did replace the things that were going to need replacing soon for sure. Plus we were stuck, and it was everyone here that helped us think of other things we never considered. Hey it even stumped the guys at Ford there and if we had not known to do those things first then we would have still been paying them on a credit card. At least after we did all the things we thought and the folks answered here, we only paid them a small amount of money for ONE thing wrong.

Hopefully I can help someone else out with at least documenting my experience. Again, THANK YOU all that answered. I really appreciate your time, help, and comments.

This forum is great -

Susan K.
 
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