I have problems with this car's a/c. When I turn my a/c on the compressor and hoses build too much pressure and that causes my a/c fan/relay fuse to blow. I was told that it might be the pressure switch or condenser. Can I please get some help???

 

Welcome!

Could be over-charged.
Could be a plugged expansion valve.

But this section is really just for welcome & introductions. I'll move this over to General Tech where it's more likely to get good answers.

 

i have never seen or heard of higher pressure blowing a fuse,I have seen it create a leak from an o-ring ,
,i would start checking for an electrical short, start by unplugging the compressor, turn a/c on see if fuse still blows, if it still blows it is from compressor upward,, if it stop blowing could be an exposed wire or shorted a/c coil, Basically if you do not see anything obvious you need to start doing the eliminating procedure

i have seen a/c coil short out, wires pinched to ground ..

 

This problem is a little weird. How do the hoses build too much pressure? Has the system been recently recharged? Are you checking with AC gauges? Are they bulging?

 

I just replaced the Compressor, Expancion valve and drier and recharged it. I had a friend of mine check for shorts but he found nothing. It build pressure when I turn the A/C on, it blows cold air for about 2 to 3 minutes then the the engine feels shaki and that when the car turn off and blows the A/C fan relay switch. And yes, it did bust the O rings from the lines connecting to the compressor. by the way how do I check the a/c coil???

Thanks for your time and reply's.

 

The coil is the electrical part behind the pulley that has the electrical connector to the compressor. It is the part to the left of the #4 in the diagram below.

Is the coil new too?