Dodge Avenger 2010 all of a sudden heated up and top hose connected to the radiator cap popped off due to the pressure. what should I do?

sound like the impelled in your water pump may have failed. Or your system is air bound. Try to open the rad cap when its cold and let it run and see if air bubbles come to the top

Sounds to me like your radiator is clogged. You can either take it out and go to a shop and have them try to clean it out or just buy another one

The cooling system has to be bleed of air.To do this locate the bleeder on the coolant inlet on engine. Remove the bleeder and the radiator cap, fill with coolant until there are no more air bubbles coming out of bleeder. Top off resivor close bleeder replace cap. Start and let it get to normal operating temp, If all is good now you are finished. If it still overheats let it cool off until there is no pressure on upper hose .Carefully remove cap and repeat bleeding process

Im looking for. 2008 dodge avenger 2.7 l timing. Chain Tentioner cap

You need a repair shop

Doesn't matter what we say, it is broke

I would bet the water pump is either siezed or the impeller (which is plastic) is broken. One thing you can do is let the engine run until the temp guage reads in the normal position. Feel the upper and lower hoses. If one is hot and the other is cold than there is no coolant flow. If the thermostat where the problem than there would still be heat since the water pump is still working. If there was heat before you changed the thermostat and know there is no heat than you have air in the system and it needs to be purged. You can do this by removing the radiator cap on a cold engine. Top off the coolant as necessary. Start the engine. Continue to monitor the coolant level and add as needed. Let the engine warm up until the fans come on. Replace the radiator cap and you should be good to go. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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You might have a heater hose connection problem.

Is there any pressure on the top radiator hose when the car has been running for awhile? If not the first thing I would do is replace the radiator cap. Make sure the radiator is full. Let the car run again to make sure you have pressure on the top hose. If you have pressure let the car run until you have equal amount of heat on both hoses. Make sure the fan works. If no pressure than you need to replace the thermostat.

Have you checked your rad fans? Rad flow? Rad condition? Possible water pump problem if those check out good.

Could be several possibilities.  Make sure the radiator fans are working.  Check radiator fluid.  Check thermostat.  Could be head gasket, any white smoke from exhaust?