some issues with my 98 d/caravan HELP!!!!

ok so im having some issues with my dodge caravan,
the first thing is it keeps over heating i changed the thermostat but it got worse i think the fans arent going on, checked all fueses any ideas on why they arent working????
the second one is about the fuel door it broke off and ever since then the driver side slider door will not open is there a way to jimmy it so the door will open again?????:banghead: also it dosent want to shift gears some times feels like its stuck in second gear what can i do to fix that thanks in advance!!!! KISHA

Overheating - Likely a bad cooling fan relay. Other players would be the engine temp sensor, Powertrain Control Module (PCM), or system wiring. First step would be connect the fans directly to the battery to make sure they work. They should come on when you turn on the A/C. Do they? If so the fans are good.

Door - ?

Shifting - If the Transmission Control Module (TCM) detects a fault in the transmission or it's sensors it will shift into second gear to prevent further damage. This is called the "limp mode". Are you seeing any other symptoms like erratic speedo or tach indications? This would indicate a bad sensor. Are you seeing a service engine light? This indicates a fault code is stored in the PCM. Either way, I would have AutoZone or a like store connect a scanner and see if any fault codes are stored. It's free. Make sure the fluid level is full. If you haven't changed the fluid and filter lately, have that done. Use only ATF-4 fluid.

On your door problem. When the gas door is open for fueling, it locks the left side door so it isn't onto the pump nozzle. Your fuel door is still in the open position. There should be a stem portion where it broke. Juse push it back in to release the lock. Hope this helps.