Rear speakers not working

the speaker will work any way connected, but if wrong way it will be out of phase with the others and may sound poor. the usual + is the solid color wire in most but not allways depends on individual manufactures, you could look at the other speaker and connect the same.hope this helps.

the norm prob is caused by the power amp gone down and burnt out the speaker coils, needs new power amp and new speakers. hope this helps

The volume control on your radio is called a potentiometer, which may be going bad. It works better when its warm because materials expand as they warm up and make tighter contact with each other.

It is also a possible a bad wiring connection exists. Poor contact will cause static, poor audio quality and intermittent output.

Your radio will have plug type connector(s) Your speakers will most likely each have two wires with single female spade connectors of different widths (keeps the polarity correct) the wire with the stripe (of whatever color) will be connected to the negative (-) speaker terminal.

So you need to check all the connections, one is making poor contact.
If both speakers (assuming you have two) sound good or bad... then start with the plug connectors for the radio and any independent black ground wire coming out of the radio.

If one speakers sounds okay check the connections on the other one. You check the connections by carefully pulling the speaker wire off of the speaker and then carefully pushing it back on making sure it feels tight and secure.

PS: If you pull the fuse for the radio, the radio will have no power and will not work. The radio coming on proves the fuse is good.

PSS: Your owners manual should provide lots of information on your sound system components.

Yes, loose connectiosn, internal integrated amp device burned, bad ground or speakers go to bad.

I would retrace your wiring and use a meter to conduct a continuity check. Sounds maybe a short or poor wiring connection. The small temp variance seems like a short happening to me at first blush.

Another way of checking is if you have access to the speak connect another to the speaker connections to see if you have the same issue.

If is isn't the wiring it could be the radio?

given that this is a 05 vehicle, no there would be no warranty. best advice is to have a professional shop install new ones. pick out whats right for you and enjoy. supervise the work if you can.

do not remove grill. remove whole door panel. power windows?

Remember seing something under one of the seats ,but in my old age it could have been a cd autochanger