AC sucks, freon issue? - JeepForum.com
 
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post #1 of 10 Old 08-16-2017, 12:21 PM Thread Starter
xjshellback
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AC sucks, freon issue?

2008 with the 3.7
150K miles

just recently the ac has started become dry heat option.

sitting at idle, blows cold.
cruise control in the interstate, blows cold.
braking/slowing down, blows cold.
accelerating (hard or easy), blows hot.
speed constantly changing, blows hot.

thinking its time to get the freon re charged? any ideas?

i have played with the kit from the store and cant get any better results.


08 WK 2in lift 265/70/17 3.7L
10 JKU Sahara 3in lift 35X12.5R18
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post #2 of 10 Old 08-16-2017, 03:14 PM
RCS1300
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If it blows cold, it is probably not the freon. If constantly changing speed creates the hot air issue I would look at the compressor clutch and/or the serpentine belt.
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post #3 of 10 Old 08-16-2017, 04:56 PM
moonvan
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I would guess A/C clutch is slipping as well or worst case the pump is wearing out and causing drag.

2008.5 Grand Cherokee S-Limited CRD
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post #4 of 10 Old 08-16-2017, 11:28 PM
azzkicker
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Belt or tensioner. The Freon has no idea you're accelerating, but the belt sure does.

Clean the pulleys really well with brake cleaner or alcohol, and probably replace the tensioner at the same time. You could try just the belt first if you're on a tight budget.

07 WK 5.7 QD2, 4" lift, 33X10" tires, M8000s
ARB twin air,Dual AGM group 49, sliders and skids
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post #5 of 10 Old 08-16-2017, 11:30 PM
azzkicker
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I guess the A/C clutch could be slipping, but I usually see those fail to lock up, not slip. Yours is not failing to lock up.

07 WK 5.7 QD2, 4" lift, 33X10" tires, M8000s
ARB twin air,Dual AGM group 49, sliders and skids
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post #6 of 10 Old 08-17-2017, 05:47 AM
jeepWK2007
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i just had mine recharged- first time in 190k, made a world of difference
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post #7 of 10 Old 08-17-2017, 05:59 PM
JackB1
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A question about recharging. I have always over the years used the high pressure line kit with gauge and fed in freon bought at store. Recently I have been hearing that the system must be evacuated first by a Dealer. Has something changed over the years?
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post #8 of 10 Old 08-21-2017, 06:22 AM
keggles
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Quote:
Originally Posted by JackB1 View Post
A question about recharging. I have always over the years used the high pressure line kit with gauge and fed in freon bought at store. Recently I have been hearing that the system must be evacuated first by a Dealer. Has something changed over the years?

The can systems you get at the store work just fine, but if you were to truly vacate the HVAC system, pressure test, and refill; it can have better results. Moisture will wreak havoc on HVAC. The dealer while bend you over for these kinds of jobs. I went to HF and bought a $100 vacuum and its been used on 4 different vehicles, was a great investment. Just need to get some good gauges.

I'm a nut, but not just a nut.
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post #9 of 10 Old 08-22-2017, 08:41 AM Thread Starter
xjshellback
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thanks for the help, everyone.


I have noticed the temp reading in the dash is way off when its blowing hot air and seems to improve as the temp gets to the actual outside temp.


the other day it was in the 90s but my dash was saying 79 for 5 miles or so and it blew hot air until it got to 93. the temp sensor is about 9 bucks so I am going to replace it and hope it helps.

08 WK 2in lift 265/70/17 3.7L
10 JKU Sahara 3in lift 35X12.5R18
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post #10 of 10 Old 09-03-2017, 08:30 AM Thread Starter
xjshellback
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i replaced the ambient air temp sensor but i don't think it made a difference as far as AC efficiency goes.

i did play with the Freon/pressures and seem to have got it right and have AC again. it hasn't been in the 90s since i got cold air back so i haven't been able to test it at its limits but i am good to go again.

thanks for the help.

08 WK 2in lift 265/70/17 3.7L
10 JKU Sahara 3in lift 35X12.5R18
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