ac issues with hot truck - PowerStrokeNation : Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Unread 07-02-2019, 07:05 PM Thread Starter
PSN Newb
 
Join Date: Jun 2019
Posts: 1
ac issues with hot truck

AC stops blowing cold air while driving. Works good if truck interior is cool while stopped, but as soon as I take off, it stops blowing cold air....Takes forever to cool truck after interior get hot. All pressures are correct. Does not ice up. Could this be a vacuum issue and how would one troubleshoot this? Vent controls work correctly and vacuum pump is working and will cycle no and off.
rthom1101 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Unread 07-03-2019, 12:47 AM
Master BS'er
 
jamiesaun's Avatar
 
Join Date: Nov 2016
Location: Boise Idaho
Posts: 5,691
Re: ac issues with hot truck

Hmmm. I guess I would look at how high the pressure gets when reved up. Maybe it's over charged.

How was it filled.

Brother James

Ps...Im pretty frickin awesome!
jamiesaun is offline  
post #3 of 8 (permalink) Unread 07-03-2019, 02:51 AM
"resident smarty pants"
 
Join Date: Apr 2008
Posts: 3,828
Re: ac issues with hot truck

The vacuum only plays a role in the blend door operation and in the valve that stops flow to the heater core.

Check to see if the vacuum line has become disconnected from that valve. It is located near the firewall in the "passenger-side/center" location.

https://www.powerstroke.org/forum/ge...r-service.html

That said, generally when that is disconnected you default to the defrost mode.

You might want to see if the degas bottle is over-pressuring.

Mark
06 F250 CC SB FX4 Lariat;ARPs OEM gaskets;Banks exhaust;DynaTrac Balljoints;RACCCV6000;Updated HPOP fitting;JimmiJammers;Ravelco;plugs&standpipes;Fumo to;Harpooned;Quadzilla XZT Fuel Press;Blue spring;DashDAQ;PHP_FICM; RiffRaff boots;DCPower270A XP;Inverter;Rancho7000's;BPD EGR cooler;BPD WaterPump;SCT Matts SRL+;ELC Ultra w/ filter;SynchroMax
bismic1 is offline  
 
post #4 of 8 (permalink) Unread 07-03-2019, 12:19 PM
PSN Newb
 
Join Date: Jun 2019
Posts: 21
I've had other vehicles that showed they were charged but after draining & recharging worked great. Just an idea. A few cans of refrigerant from walmart isn't much.
Bigmatthew86 is online now  
post #5 of 8 (permalink) Unread 07-03-2019, 01:52 PM
Master BS'er
 
jamiesaun's Avatar
 
Join Date: Nov 2016
Location: Boise Idaho
Posts: 5,691
Re: ac issues with hot truck

Quote:
Originally Posted by Bigmatthew86 View Post
I've had other vehicles that showed they were charged but after draining & recharging worked great. Just an idea. A few cans of refrigerant from walmart isn't much.
If The system is stagnant, that can be true, but run the ac with the gauges and it's a very different story.

Also, if it were undercharged, he would have the opposite symptoms. Warm while idling and colder when reving.

The water valve is a good thought too, but vacuum isn't related to rpms on a diesel. The function of that valve shouldn't have anything to do with how fast he's going.

Its a weird one, but the high side pressure is definitely where I would start. Does anybody know if the AC in these trucks have a high pressure switch? I know some do for sure.

Brother James

Ps...Im pretty frickin awesome!
jamiesaun is offline  
post #6 of 8 (permalink) Unread 07-03-2019, 02:02 PM
PSN Veteran
 
Blue-Truck-Nut97's Avatar
 
Join Date: Jan 2019
Posts: 691
Re: ac issues with hot truck

Is the condenser packed full of mud, bugs, or leaves?

Sent from my E6810 using Tapatalk
Blue-Truck-Nut97 is offline  
post #7 of 8 (permalink) Unread 07-03-2019, 03:45 PM
PSN Local
 
Philhan69@aol.com's Avatar
 
Join Date: Jul 2017
Location: Gaffney S.C.
Posts: 224
Re: ac issues with hot truck

Mine blowed hot when I over charged it. It was cold at first but the next day started down the road and nothing but hot air. Got a new gauge and hose and it showed overcharged. I let some out and got it in the right area and it's been cold ever since. My gauge was bad..

Sent from my SM-G955U using Tapatalk
post #8 of 8 (permalink) Unread 07-03-2019, 09:49 PM
don't play well w others
 
Dustybumpers's Avatar
 
Join Date: Jan 2018
Location: in my own world
Posts: 2,946
Re: ac issues with hot truck

My town car did that right before the compressor locked up.

Charlie
"A common mistake people make when trying to design something completely fool proof, is to underestimate the ingenuity of a complete fool."
Dustybumpers is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the PowerStrokeNation : Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome