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Old 09-30-2010, 05:23 PM   #1
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Tempermental hvac!?

My hvac is all frekked up. Firstly I still have no lights on the controls after I replaced all 3 bulbs. And no matter what setting the controls are on, the blower goes on and off very erratically ( except when it's off of course). I cannot figure it out. It's especially annoying when it's 90 degrees outside with the hard top on!!

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Old 09-30-2010, 06:40 PM   #2
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These aren't very good but this connection looks melted doesn't it? Anyone know what this means?
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Old 09-30-2010, 10:15 PM   #3
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I found something about adding relays... But I don't know anything about those!! Do I need to get a new mode selector switch too?
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Old 09-30-2010, 10:46 PM   #4
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I don't know. But if u haven't search on jeepforum. Sometimes there are answers there.
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Old 10-01-2010, 08:05 AM   #5
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all the threads ive found have to do with the resistor melted. Does the mode selector have the same issue?
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Old 10-01-2010, 11:23 AM   #6
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Okay so I'm pretty sure I have searched and read every article on this issue. Either something is not clicking or my problem is slightly different.

My Heater/AC Vacuum Switch is the part thats melted- the part that selects the AC/Heater modes. not the Resistor- the part that controls how much air is blown.

Do I need to just get a new Heater/AC Vacuum Switch?

Do I just need to lose the melted wire connector and connect the wires directly to the contacts?

If I install relays on the resistor will it fix the Melted Heater/AC Vacuum Switch problem?

What about the bulbs on the control panel? what causes these to not work with new bulbs even?
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Old 10-01-2010, 12:12 PM   #7
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Quote:
Originally Posted by dirk124 View Post
Okay so I'm pretty sure I have searched and read every article on this issue. Either something is not clicking or my problem is slightly different.

My Heater/AC Vacuum Switch is the part thats melted- the part that selects the AC/Heater modes. not the Resistor- the part that controls how much air is blown.

Do I need to just get a new Heater/AC Vacuum Switch?

Do I just need to lose the melted wire connector and connect the wires directly to the contacts?

If I install relays on the resistor will it fix the Melted Heater/AC Vacuum Switch problem?

What about the bulbs on the control panel? what causes these to not work with new bulbs even?
Yes, the mode switch connector has the same melting problem as the fan speed connector. The 3 wires are the fan relay, ground, and a/c switch. The mode connector is hard to find (discontinued), so I cut mine off and connected the wires directly to the switch, like you suggested.

I don't think the bulbs on the control panel are related. Separate issue.
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Old 10-01-2010, 03:38 PM   #8
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when you wired directly to the switch did it solve the problem? did you have to get a new switch?
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Old 10-01-2010, 04:31 PM   #9
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when you wired directly to the switch did it solve the problem? did you have to get a new switch?
The mode switch was fine. If the 3 male tabs look o.k. the switch should be fine. Yes, it fixed the problem. A jeep mechanic told me the reason the connectors melt is because of a loose connection. Here's what I did :

If you can't find it, which I couldn't, I cut the three wire connector off, broke it open and brought one of the female spades to Carquest. They had an exact match (about 3 bucks for a box). I made a pigtail with them, some short wire lengths and solder. ( make sure you use the right gauge, 12 for the fan and ground and I think 18 or 20 for the light green a/c wire). You can also use crimp connectors instead of solder. Make sure they slide onto the mode switch tabs nice and tight. then wrap each with electrical tape because theres no more plastic between them. So far so good, its been about 4 months.
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Old 10-01-2010, 08:06 PM   #10
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Ok so I do that then do the 4 relays on the resistor and I should be all set?
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Old 10-01-2010, 09:13 PM   #11
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In my opinion if you have good connections back there you shouldn't have to do that relay thing. A loose electrical or ground connection is what melts those connectors, not too much current draw from the blower motor. At least that's what a reputable jeep mechanic told me. I fixed mine about 8 months ago (it says 4 up there because I pasted that from an earlier post) and I did a 1000 mile road trip this summer with the a/c on, no problems.

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