Question about 2003 Hyundai Santa Fe

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Cabin heat and defroster do not work correctly at highway speeds

Cabin heater and defroster works properly during warm up...when speed gets up to highway speeds the windshield begins to fog up and cabin temp drops.

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That easy! i was a master tech 4 hyundai and other manufacturers, first thing change your pollen filter. if syptoms still pursist please feel free to contact myself,

many thanks

Dominic Hill

Posted on Dec 11, 2008

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Your thermostat may be stuck open cahec it and replace it
dont forget to rankme and my solution

Posted on Dec 11, 2008


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Heat and ac blower sound normal but very little air is moving inside the cabin. What can cause this?

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Hi Cheri, do you mean the fan is not blowing air out of the air vents?

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No more hot air at low speed

Hi Espd, The heater inside the cabin is a very simple affair. It circulates the coolant from the engine cooling system through small radiator(s) inside the cabin. As the system works at high RPM it sounds to me as if there is a restriction in the system. The restriction could easily be a defective mixing valve or a clogging of the system. As your vehicle uses an electronic climate control system, it may well be a problem in that system. Have a diagnostic scan carried out on the climate control. If faults are recorded have them attended. If not, back flush the cooling system. (Back flushing as you know, means flushing the system in the opposite direction to the operating flow). Check the operation of the valve and make sure it is opening fully. Regards John

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No heat when stopped for traffic

1-your thermostate is stuck open half way. thermostate is a simple device that made of enlarging metals when heat is applied. it suposed to be in close position to allow engine heat up, when specified temp reached it opens and let it flow and radiator tries to keep coolant cool.when it is broken it stucks or it acts slow or it wont acts at all. in your situation it is stuck open half way. it allows enough water to be heated but flow is limited to heat cabin heater.

2-if there are cabin heater selenoid/selenoids for two different temperature for cabin left and right, on some instance those selenoid valves to adjust cabin heater stuck open or closed like thermostate acts on first case. so heat is not enough to heat up cabin heater.

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No heat

Sounds like one of the fancy heaters. They have circuit boards that can go bad. don-ohio

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