Question about Hyundai Motor 2003 Elantra

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Fluctuating engine temp a/c sends out cold air intermittently

New thermostat &radiator cap, also have check engine light. heater can go from very hot to luke warm no pattern. seems when engine RPM is increased the engine temp stabilizes, but eventually goes back to wild fluctuations. A/c was luke warm then suddenly got ice cold for 5 minutes then back to luke warm. very erratic hot to cold engine temp fluctuation on dash gauge. Whats up?

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Here's the thing. The ECU will shut down AC if the engine temperature is too hot. If the coolant temperature sensor is malfunctioning (lying to the ECU) telling it that the temperature is hotter than it actually is, the computer will turn the AC OFF.

Posted on Sep 12, 2009

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Heater is blowing but no heat


First check for low Anti-freeze, then you can squeeze the in-let line prior to the thermostat. It should be hard,when engine is cold. It is good to do this with the radiator cap off since you can watch for water movement while preforming this task, but if it is allowing the water to go through the thermostat; then it is staying wide open. It then will need to be replaced. Your heat should come back at that point.

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1 Answer

Cabin Heat is Intermittent / Fluctuates / Cycles


You may have air trapped in the lines to or from the heater core.
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It's more difficult without direct radiator access and may require several cycles of hot/cold to allow refilling through the overflow.

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1 Answer

2004 Chevy Tahoe. Heater working only at higher speeds.


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Start engine and run at about 1500 roms until the engine warms up and thermostat opens.
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Shut off engine.
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please Rate as fixya if this works. good luck

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1 Answer

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