A/C and gas mileage issues - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK > Troubleshooting/Problems

Reply
 
Thread Tools Display Modes
 
  #1  
Old 09-19-2014, 04:47 PM
Member
 
Join Date: Apr 2014
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1191
Cheez is on a distinguished road
A/C and gas mileage issues

Grand Cherokee Limited
4.7, 2WD

A/C Issue: The driver side air is blowing cool, not cold, while the passenger side is blowing slightly cooled outside air. The rear vents are also blowing the temperature of the passenger side vents. I've tried recharging the system with some R134a, it cooled both sides down a couple of degrees but in a week it's back to blowing warm air. Any suggestions there?

Fuel mileage issue: About a week ago, the fuel pump went out on my Jeep. I dropped the tank and replaced the pump itself (kept original sending unit). I've only ran one tank since replacing the pump but I've noticed significantly decreased mileage. The computer is reading 10.5 MPG and the trip is confirming that number. Most of my driving is stop-go on campus but I used to average 16-17 mpg. The Jeep runs just as it did before replacing the pump so I'm stumped. Also I haven't seen any leaks appear under the Jeep. Any suggestions on this one?

Thanks for any help you guys can give me!

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 09-22-2014, 05:04 PM
Premium Member
My Jeep: 2014 5.7L WK2
 
Join Date: May 2013
Location: Colorado
Posts: 4,118
Thanks: 74
Thanked 297 Times in 261 Posts
Rep Power: 46572
lstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond reputelstowell has a reputation beyond repute
Re: A/C and gas mileage issues

Quote:
Originally Posted by Cheez View Post
Grand Cherokee Limited
4.7, 2WD

A/C Issue: The driver side air is blowing cool, not cold, while the passenger side is blowing slightly cooled outside air. The rear vents are also blowing the temperature of the passenger side vents. I've tried recharging the system with some R134a, it cooled both sides down a couple of degrees but in a week it's back to blowing warm air. Any suggestions there?

Fuel mileage issue: About a week ago, the fuel pump went out on my Jeep. I dropped the tank and replaced the pump itself (kept original sending unit). I've only ran one tank since replacing the pump but I've noticed significantly decreased mileage. The computer is reading 10.5 MPG and the trip is confirming that number. Most of my driving is stop-go on campus but I used to average 16-17 mpg. The Jeep runs just as it did before replacing the pump so I'm stumped. Also I haven't seen any leaks appear under the Jeep. Any suggestions on this one?

Thanks for any help you guys can give me!
A/C
How did you charge it? How much charge? A manifold and gauges to make sure it is really full? Leak test? A low charge should result in the compressor cycling on and off fairly rapidly, and if the cooling improved after addition, that would seem to be at least part of the issue. However if it is fully charged with coolant and not oil, and still won't cool you may have a problem with the evap side that does the actual cooling. Unless you have a decent manifold and gauge set, [or can borrow one since you mention "campus"] might be best to toss in the roughly 100 bucks and have an A/C servicer pump it down, leak check it, and fill.

Fuel mileage hard to say, could be a clogged cat from your prior failure, or you could have a bum pressure regulator
Reply With Quote
Reply

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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
ABS light and "Service Elec Brake System" and gas mileage gone to 6mpg adlegs Troubleshooting/Problems 27 08-03-2014 11:10 PM
white smoke from exhaust and horrible gas mileage jd31 Trouble Shooting/Problems/Service 33 10-02-2013 02:21 PM
Can I mix High mileage Full synthetic with regular High Mileage? sergioad89 Engine Performance/Intake/Exhaust 8 06-30-2012 06:38 AM
Getting Horrible Gas Mileage Sodelcustoms Troubleshooting/Problems 16 01-20-2010 06:54 PM
4.7L gas mileage... Bigdiesel74 Performance Modifications 15 10-22-2009 09:58 AM

» Premium Vendor Showcase
Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:37 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.