okay for about a year ive had this problem...everytimei put in a fuse for my interior lights/charmer it blows out...now it works for about a week on a 30 AMP! fuse which the stock rating is 7.5! today i wanted to figure out when it would blow out...so i popped in a new fuse and made sure everything was working correctyly which it was...i tried the sunroof...still working...tried the heater...and bam lights shut out....so where should i start looking!?!?! BTW this is in a 94 integra...thanks a bunch!

 

ttt!!!!!!!!!

 

There is no real "heater". The fan could be shorting. Is it spinning at all? Wierd noises? Burning smell? I would pull out the fan and take a look at it. May be dead.

 

I would never increase the size of the fuse to more than what is recommended.

 

It wouldnt matter anyway if u increse the rating. Its still gonna blow. Check the fans circuit. Trace the wiring if you have a diagram and make sure no wires are exposed or melted.