Question about 2004 Kia Sedona

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Temp gauge goes up when stopped and goes back down when cruising.

Dont see any coolant leaking. also, the heater takes a long time to heat up and even blows out cold air every so often.

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  • billgiants20 Feb 28, 2009

    how do i check the thermostat?

  • dstuttle Mar 22, 2009

    The temp goes up when the rpms drop off. If I put it in neutral while coasting down hill it doesn't matter. Radiator fan working fine. Coolant is fine. I thought about thermostat, but is the water pump driven by the serpentine belt? I am concerned that the water pump is going out. It has 73,000 miles on it. Any thoughts on the water pump? Thanks!

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Your thermostat is either defective or your cooling fan is not engaging on the right tempertures (sensor)

goodluck

Posted on Feb 28, 2009

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Check the coolant level and the thermostat

Posted on Feb 28, 2009

  • Ronnie Houston Feb 28, 2009

    easiest way is to take it out and set it in a pot of boiling water to see if it retracts but it will be simpler to buy a new one they are only about 5.00

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4 Suggested Answers

dvs9mm1971
  • 114 Answers

SOURCE: Temperature gauge fluctuates and the heater blows cold air

Sounds like the thermostat needs to be replaced. If you do the work yourself be sure the temp threshold is correct and the flow direction is correct when installed. Good luck to you

Posted on Oct 16, 2009

localwonder
  • 6784 Answers

SOURCE: My car heater is blowing cold air

The shut off valve on the heater core was left shut during the repair on your coolant system. the repairman forgot to re open the shut off valve . this is the problem. open the shut off valve and, the air will become hot again. as for the gauge fluctuations, the actual gauge may be malfunctioning.

Posted on Feb 24, 2009

  • 398 Answers

SOURCE: i have an over heating prob it also leks coolant

look 4 the heater control valve

Posted on Dec 16, 2009

  • 369 Answers

SOURCE: problem with heater blowing cold

Replace your thermostat. first of all it is the cheapest.It is probably stuck in the closed position not allowing your coolant to flow.

Posted on Feb 19, 2010

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Engine tepmrature goes up or down when i turn on the heater


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Thermostat?


It actually sounds to me like you're low on coolant. My Jeep leaks coolant and whenever it gets low the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Hot water runs through the heater core regardless of whether or not your thermostat is open or closed. That's why your heater works in the winter even before the engine is at normal operating temperature. The fact that the heater stops working is a good sign that the thermostat is probably not the culprit.

As for the water pump. If the water pump was bad, your temp gauge would go into the red and stay there. Water pumps generally don't work intermittently. Either it's good and ot works, or it's bad and it doesn't.

However, if you are in fact low on water, as I suspect, it means you probably have a leak somewhere. The leak could be in the water pump housing gasket, so depending on where you take it for repairs, they may try to sell you a new water pump anyhow. So just beware of that.

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