2011 Grand Cherokee Laredo - blower motor cycles on/off - Jeep Garage - Jeep Forum

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Old 12-02-2015, 03:43 PM
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2011 Grand Cherokee Laredo - blower motor cycles on/off

My wife just recently began experiencing an issue with her 2011 Jeep Grand Cherokee Laredo. She will have the blower motor running and it will just quit, then cycle back on again maybe a moment or two later. Sometimes the motor will quit running for up to a minute.

It doesn't appear to matter which blower speed setting it is on. As it's winter outside, and we are needing to take this on a trip out of state this weekend, I am looking for a solution quickly. We'd hate to have something go out on the way and not have heat (heading to Minnesota.) I'd much rather diagnose/fix this myself, than rely on the local Jeep dealer (that's another story entirely.)

My brother-in-law, who was down for the holidays and is a car tinkerer, thinks it may be related to a corroded ground? Unfortunately, he wasn't able to look it over before he left.

Any thoughts out there on what this might be? Anyone else had this occur on WK2 models?

Thanks!
Mike

'11 Grand Cherokee Laredo
'97 Cherokee Sport

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Old 01-22-2016, 01:09 AM
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Re: 2011 Grand Cherokee Laredo - blower motor cycles on/off

I have a similar problem and found a thread about the gear on the blender door being worn out which sends s false signal to the hvac comp to shut off... Let me see if i can find the link to the thread...


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Old 01-22-2016, 01:10 AM
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2011 Grand Cherokee Laredo - blower motor cycles on/off

Passenger side Blend door gear replacement

Check that out, it's a great post for this problem

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Old 01-22-2016, 02:56 PM
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Re: 2011 Grand Cherokee Laredo - blower motor cycles on/off

Been there, done that. Definately pointing a finger at a broken door gear. As for which one, check the output temperature on both sides. Set one side full hot and the other side full cold. Vise versa. That gremlin should be easy to find.
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Old 10-08-2016, 01:10 PM
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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...

Symptom:
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.
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Old 10-16-2016, 07:38 AM
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Re: 2011 Grand Cherokee Laredo - blower motor cycles on/off

I had the same problem however, it only occurred after the PCM was replaced.
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Old 10-16-2016, 10:00 AM
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Re: 2011 Grand Cherokee Laredo - blower motor cycles on/off

Quote:
Originally Posted by Remleym View Post
A few folks have mentioned this or similar problems. I thought I'd add my $0.02 worth...

Symptom:
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.
Took it back into the shop and they played around with it for over an hour. It was a cool day so the symptom never reappeared. They did make a note in their computer log so when I come back in early summer next year with the same problem maybe we can pick up where we left off. At least they didn't charge me for this visit.
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