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Old 07-31-2019, 11:06 PM
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AC Blower only works on with high end diagnostic computer connected

I have scoured pages and pages of tech threads, and have yet to come across the issue I am having. Which is...


My AC blower up and quit yesterday and of course it is near 100 degrees in south Texas...


The symptoms: No warning, it just quit. All fuses are good. blower harness and connections are solid with no corrosion or build up of any kind. Recirc door will open and close. All lights on the controls are working.



The weird part: I took it to a local parts store who connected a diagnostic computer to it to read codes. The blower fan starts working during the check, but it was not a great computer so it showed no codes were thrown and tech guy says I need to plug in a better computer that can look deeper into the systems. When he unplugged the computer, the blower quit again. The only time it has run now is connected to that computer. I am not sure if it is blowing cold though...


Anyone having similar issues?
Anyone have any ideas before I am forced to take it to a shop and pay through the nose? Doesn't help that money is tight the next couple of months. =(


TIA

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Old 08-27-2019, 06:10 AM   #2
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Wild guess-bad blower motor. They are cheap, like $35, and quick and easy to put in.

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Old 08-27-2019, 10:05 AM   #3
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I wouldn't put a blower motor on it cause it clearly works. My guess is it's a control issue by the HVAC module.

What year is your jeep? Your garage said 2014 but wanted to confirm. Also is it a automatic temp control or manual control HVAC?

My guess is you really need to hook up a better scanner that can pull HVAC codes. Or validate that there are no software updates for the HVAC module.
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Old 08-27-2019, 08:23 PM   #4
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If it's a manual HVAC, I'd check they fan speed selector switch.
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Old 08-27-2019, 08:52 PM   #5
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Quote:
Originally Posted by JK FunnSki View Post
If it's a manual HVAC, I'd check they fan speed selector switch.
The fan speed selector switch is part of the HVAC control module. Only real way to check is to plug a scan tool in, read live data on the HVAC module and see what it's reading. You can't replace just the dial short redoing the circuit board in the module.

The HVAC module....on the manual control HVAC....will pulse modulate the ground on the fan to vary the speed.

The HVAC module....on the auto control HVAC....is different. It has a wire that goes from the HVAC module to a blower module which controls the actual mower. I'd have to go look at how it is controlling it but suspect a pulse width modulated signal or ground is involved.
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ac blower motor , ac blower not working , ac issues , ac system

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