AC blows hot & humid after restart ('04 6.0L) - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Trucks | Utes | Vans |SUVs | Crossovers > Ford F-100 | Ford F-150 | Ford F-250 | Ford F-350 | Ford Super Duty | Ford Diesel
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

Ford F-100 | Ford F-150 | Ford F-250 | Ford F-350 | Ford Super Duty | Ford Diesel Forum for discussion of the Ford F100, F150, F250, F350, Superduty and Diesel trucks.

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 08-27-2007, 07:46   #1 (permalink)
Registered User
 
Join Date: May 2006
Posts: 3
AC blows hot & humid after restart ('04 6.0L)

I live in AZ and during summer I leave work when its 110+ (you can imagine how hot the cab would be). When I start driving, AC works fine, but does take time to cool down the cab (I wish it did so faster, but I suspect this is the downside to having a king cab).

The problem occurs when I restart the truck after having reached operating temp (e.g. stopping at the store to pick something up). For the first few seconds, the AC blows hot humid air, and seems to take quite a while (4-5 min) before acting normally again.

Could this be a problem with the heater control valve? When the truck is turned off, does the vacuum subside and allow it to open whereby hot coolent entires the heater core? Should the vacuum reservoir hold pressure for some period of time and its not doing so? This isn't a killer problem, more of a annoyance I'd like to understand better.
Duke2U is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 08-27-2007, 09:01   #2 (permalink)
wwb
Registered User
 
Join Date: Nov 2005
Location: Manitowoc, WI
Posts: 138
Re: AC blows hot & humid after restart ('04 6.0L)

When you shut the truck off, you have a huge chunk of iron that's well over 200 degrees sitting under an insulated hood.

After sitting a few minutes, it will heat up the entire heater/AC system.... even the firewall and the cab ducting. After you start the truck, it has to cool down all that material. Plus, the heat soak will raise the refrigerant pressure in the A/C sytem, and it will have to cool down some by running outside air and drop the pressure before the compressor will kick in. That's the warm, humid air you're getting. Once the compressor kicks in, it will cool almost instantly.

If it's a major nuisance, and you know that you're only going to leave it for a couple minutes, get a second key made so you can leave it running and lock it. If you're going to be gone for more than a couple minutes, as you said, it's not the end of the world.
wwb is offline   Reply With Quote
Old 09-08-2007, 01:51   #3 (permalink)
Registered User
 
Join Date: May 2007
Posts: 2
Re: AC blows hot & humid after restart ('04 6.0L)

When the engine is shut off the oil temp increases over 25 degrees above the coolant temp. There is an oil cooler in the vally on top of the engine.
When this happens the computer restrict fuel and shuts off AC till the oil return to the proper temp.
Leaving it run is the answer.
papabear8233 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Trucks | Utes | Vans |SUVs | Crossovers > Ford F-100 | Ford F-150 | Ford F-250 | Ford F-350 | Ford Super Duty | Ford Diesel



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 22:27.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.