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-   -   HVAC resistor keeps blowing (https://www.cherokeeforum.com/f2/hvac-resistor-keeps-blowing-246107/)

TBO13 08-03-2018 10:32 AM

HVAC resistor keeps blowing
 
I have replaced the resistor under the passenger side dash 5 times and as soon as I do the air comes on and works fine for a day or two then stops working again. As soon as the resistor is replaced it immediately starts working properly. I replaced the blower motor about 9 months ago when the first resistor blew thinking that was the problem. Also this is probably a separate problem but air and heat both work fine but only come from the defrost. I have checked all vacuum lines and replaced the vacuum reservoir under the passenger side of the bumper. Jeep is a 99 XJ with 180k miles

jordan96xj 08-03-2018 10:53 AM

The blower itself is responsible for cooling the resistor (which gets red hot like the heating elements of a hair dryer). Because of your door mode problem, it sounds like air is not going over the resistor, causing it to meltdown within a short time of being used. Focus on fixing the blend/door issue, and that will likely solve the resistor meltdown issue.

TBO13 08-03-2018 11:02 AM

Everything I have found relating to the air only coming from the defrost points to a vacuum line issue. I will replace the connectors in the lines and go from there. Thanks for the quick reply

cruiser54 08-03-2018 06:45 PM

https://cimg5.ibsrv.net/gimg/www.che...5df767968a.jpg
Here:


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