Re: 2011 Grand Cherokee Laredo - blower motor cycles on/off
A few folks have mentioned this or similar problems. I thought I'd add my $0.02 worth...
A/C blower cycles on high speed for a minute or so then drops to zero or very low speed for half a minute or so. Then the cycle repeats. Typically the high - low blower cycling repeats 5-6 times over a period of 10-15 minutes then the cycling stops and the blower runs at an intermediate speed. This happens regardless of whether the A/C is set to Auto or a manual speed setting. Note that cold is still produced during this cycling. It appears that this is a blower only and not a compressor problem.
I brought the Jeep in for this A/C blower cycling problem in September 2016. It was determined that parts were required and they were ordered. I brought the Jeep back in on 3 August 2016 to have the parts replaced. Two parts were replaced at that time:
1. Module/resistor/power, blower motor (P/N 68079480AA Module - Power)
2. Control Assembly, Instrument Panel HVAC (P/N 68111109AQ Control - A/C and Heater)
The labor and parts were covered under the extended service contract so the total bill was $100.00. The parts replacement seemed to have fixed the problem.
However, over the next few weeks the A/C blower problem returned intermittently. It seems to be a problem when the temp is around 80 degrees or higher and the car has been sitting in the sun. The problem again happened on 6 October (a warm day) and it was exactly the same problem originally described.
Jeep is going back into the shop on 10 October 2016 for another try at fixing the problem.
2011 Jeep Grand Cherokee Limited, charcoal grey, 3.6L engine, 20" wheels