Originally Posted by Cheez
Grand Cherokee Limited
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!
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