Heat/AC panel and fuse 48
 

I've had this problem lately with my 02, 4.4 auto a/c. Fuse 48 blows within seconds of start up. I searched and found several people here that have had a similar problem. One person suggested blowing out the sensor fan on the control panel. I did that and it worked long enought to give me a false sense of success, the fuse blew again. So, more searching, first for a wiring diagram but found nothing useful. Most every post I found that had fuse 48 blowing ended up replacing the Heat/AC control panel and that was the fix. I found one on ebay, relatively inexpensive, and installed it but the fuse still blows. It lasted for 6 or 7 starts then it was done. My question..... what else does fuse 48 power? My fuse panel diagram says it controls AC and heated washers but I don't have those. Where can I see a wire diagram without throwing down bucks for a Bentley? Thanks for any help.

Look at the top right under online references.

There are no "online references" selection button at the top right of my view. Thanks

anyone?

thanks for the link, i can't seem to open it tho

ya - mine was blowing intermittantly, so I went from a 20A to 25A fuse and works fine now. Might be out of spec just slightly, but for now I am not to concerned with it as I have seen no strangeness or anything.

mine is 7.5 amp

7.5 amp is what it should be ...not 20a.!This fuse only powers ac and heater.

ya - I forgot the numbers, I swapped in a 10A instead. the 7.5A would not blow immediately, but at least during summer months when using the AC it would occasionally go out.