Why is the lightning bolt symbol flashing on my 04 ram 2500 hemi?

SOURCE: 2004 dodge ram 1500 5.7 hemi 4x4 4 door 90k miles

Take throttle body off, clean Throttle Body with Carburator cleaner. I had same problem and its the ethynol in fuel that creates a build up in the throttle body which creates this problem. I did what a friend of mine said to do (service manager at Dodge Dealership) it hasnt happened again.

SOURCE: blower motor makes loud noise when on high

I have a 2004 dodge ram 1500 with the same problem, vibrating blow fan when on high, pulled the blower fan out and found a piece of the hinge from the recirculation door and felt the recirculation door sitting up on the vent of its hinge. Crappy engineering once again.

SOURCE: what does the code p0300 mean on a 04 dodge ram

http://www.obd-codes.com/p0300

SOURCE: how do i change the power steering pressure switch

From the Factory Service Manual, you can get one relatively cheap from www.promanuals.net. Here is a link to your 2004 Dodge Ram Service Manual.

The power steering pressure switch is installed in
the power steering high-pressure hose (Fig. 9).

(1) Disconnect electrical connector from power
steering pressure switch.
(2) Place a small container or shop towel beneath
switch to collect any excess fluid.
(3) Remove switch. Use back-up wrench on power
steering line to prevent line bending.

SOURCE: how tro replace heater core in 2003 dodge Ram PU

dodge want $800 to$1000 for doing this and I can see why.You have to raise or remove the whole dash recover you a/c freon ,disconect your a/c lines and heater hoses remove your heater box and put on a work bench remove the top and remove heater core,now next the last one I did the new heater core will not fit you have to modify the box so your new heater core will fit,put it all back together and fill with coolant and charge a/c, man I got tirered just typing this much less doing it, I hope this helps