Hyundai accent 2006 temp drops to cold from normal

The temp will rise slightly when the vehicle idles. This is normal. Don't take the dash gauge for being accurate, it is just an indicator. If the temp is too high, it could be the radiator is clogged, the pump impellors are bad or some other things.

Not necessarily. The vehicle, in motion, has enough air flow through the radiator that the fan is usually not needed. The fan will run if the vehicle sits and idles for a while and the coolant temp rises since there is no air flow through the radiator. If you are worried about fan operation, there are two things to check. The fans will ALWAYS come on if the A/C is turned on. That is because the fans pll air through the A/C coil in front of the radiator. Air must flow through that at all times or pressure in the A/C lines will get too high. So test that circuit simply by running the engine and turning on the A/C. If the fans run, that part works. Now turn the A/C off. Let the engine run until the temp gauge gets to around 200-220 degrees F. The fan should come on about this time and run until the temp drops to about 190. This cycle will continue to keep the coolant from getting too hot. If the temp gauge gets into the red area and the fan has not come on, shut down the vehicle immediately to prevent engine overheating, and then troubleshoot that portion of the fan circuit.

You need to scan the ECM to see if there are any stored DTCs. Just guessing, it sounds like a bad cam or crank sensor. They can be temperamental when they get warmed up, if they are bad.

You have to make sure the thermostat is working properly and is the correct one. Idle the vehicle for about 20 minutes and then feel the upper radiator hose. It should be hot to the touch. Drive the vehicle and when the temp gauge falls to 'cold' stop and feel it again. If it is much cooler to the touch than before the thermostat is defective or wrong.

your temp mark will also depends on your thermostat range anywhere between say 90 and say 180 if your temp goes in the red then you should be concern

car shuts off when temp, gets to normal--- causes: low coolant, failing coolant temp. sensor, air in water pump, failed radiator fan, kinked heater hose, check the coolant temp. sensor first.

replace thermostat and than see if it still does it.

check coolant level ,must be low ,chck for coolant loss

Sounds like faulty engine temp sensor. When it drops to cold, the engine control unit picks this up and alters the fuel mixture accordingly. The ECU will be making it a very rich fuel mixture for cold starting, hence very poor running when engine is hot.

TL

Hondas are famous for this, my accord does it. This is normal UNLESS it still idles high after normal running temp. has occured. Watch your temp. gauge when it reaches normal temp tap the gas a little bit if the idle drops then it is fine