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2003 Hyundai Santa Fe No Heat
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lyssa98
New User
Mar 10, 2009, 8:29 AM
Post #1 of 6
(12932 views)
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2003 Hyundai Santa Fe No Heat
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I have a 2003 Hyundai Santa Fe and it does not provide heat. When the temp is really cold (10) there is absolutely no heat. When it is in the 20's I get some heat but, only itermittently. I changed the thermostat and made sure the radiator was topped off, and still no luck. The car is an automatic, 6 cylinder (not sure of liter size). The engine heat guage is working and when the car is warm it is about half way. Could it be water pump or heater core related?? It is supposed to get very cold here so, a timely reply response would be greatly appreciated. Thanks.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 10, 2009, 9:11 AM
Post #2 of 6
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Re: 2003 Hyundai Santa Fe No Heat
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Did this just happen or some history of this before changing thermostat?
Either way you seem to know cooling system must be truly full at the radiator. If cap is on remote recovery tank try when cool sqeezing a larger hose like upper radiator hose and see if bubbles come up at that tank - should be just liquid.
Guessing temp reads norm and it's steady there - right? Need to know.
If ok so far, now feel heater hoses going to the heater core. One should be about too hot to touch (use care of course!) and the other should be warm but not quite as hot with heater on full temp request full fan.
Now try with low fan and see if there's a difference and a difference in output temps in vehicle.
If either of those the core may be part plugged OR low force from water pump not heard of yet on this vehicle but possilbe. Usually if a water pump low pumping ability it would be better at higher RPMs at first and possibly near nothing at idle.
If any debris or goo is noted or just to do anyway flush whole cooling system. Make certain you don't exceed 50% concentrated antifreeze as too strong works against you!
Are you able to flush this yourself or send it out? It would help to see the heater flushes separately for flow and if all that doesn't work it's still good maintenance and let's go from there,
T
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lyssa98
New User
Mar 10, 2009, 9:58 AM
Post #3 of 6
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Re: 2003 Hyundai Santa Fe No Heat
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I changed the thermostat for this very reason.
Temp reads fine.
Can't check the hoses until I get home but, l will do that.
Fan speed does not make a difference with regards to heat.
Engine RPM does not make a difference.
This morning I had heat pretty quick. After 10 or so miles, it was blowing cold, then warm, then cold, etc...
It sounds like you think the heater core is blocked. Is there anything else it could be??
Thanks for the advice fellow vet!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 10, 2009, 3:03 PM
Post #4 of 6
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Re: 2003 Hyundai Santa Fe No Heat
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Hmmm? What I need to know now is if the temp is actually staying exactly put - dash gauge reading ok for now. Especially when colder outside with a heater going the temp of the engine should stay exactly put as regulated by the thermostat which I believe is fins as now two have behaved the same.
I know you won't like it but I'm suspecting air in the system - perhaps just a little at a time that at the moment is capable of self purging thru the normal cylcles of the thermostat. Not to worry just yet but need to know that first.
If this can just sit still and blow heat constantly without changing engine speed I'd like to know that too. It's a waste to just sit and wait where you start off or park it the longest like overnight but I'm trying to nail down why this can be intermittent without wild overheats. So far it's not consistent with the usual plugged heater core but do observe and report if any gooey junk is noted in the antifreeze.
One more for the day - try to get an accurate reading of the freeze protection and take several readings and pls report that too,
T
Ps: The "Veteran" designation is just a site designation - NOT associated with any military service of any kind but just a #of posts thing this site does. Appreciate the good thoughts either way :-)
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lyssa98
New User
Mar 10, 2009, 4:41 PM
Post #5 of 6
(12911 views)
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Re: 2003 Hyundai Santa Fe No Heat
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The temp guage does not fluctuate at all.
I have a Ford F150 that was having wild swings with the temp guage and I first replaced the thermostat (no help), then the radiator and hoses (no help) and finally the water pump (problem solved). It gave no indication of being bad (no leaks).
This morning when I left for work, I had heat within a few minutes and noticed every once and awhile that only cold air was blowing. Maybe 25% of the 50 mile commute.
When I came home this afternoon, I didn't have any heat at all for about 30 minutes. Traffic was slow to stop and go. During the stop and go period, I switched the heat location from defrost to floor to vents a few times and I don't know if that did something but, I had heat. Very good heat. I noticed only a couple of times that only cold air was blowing and it did not last long.
After arriving at home, I let the it sit for 3 to 3 1/2 hours and went out and started it. Just like this morning, it seemed to be blowing warm air. Also, when I got home, I did not (intentionally) turn the heat selector to off. I normally do this.
When I replaced the thermostat, I lost about one half of the radiator fluid. At that time, I did not notice any "gooey stuff" and when I was done, I replaced the lost antifreeze with new (50/50).
I don't have an antifreeze tester but, it looks good visually. No foam or oil.
Thoughts?
By the way, military veteran or not, you are still serving the people of this country (and maybe others as well) in a noble cause.
Thanks, Greg.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 10, 2009, 5:07 PM
Post #6 of 6
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Re: 2003 Hyundai Santa Fe No Heat
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Greg,
What I'm thinking now with likely ok antifreeze and now knowing a 50 mile ride with some time without heat and no gunk noticed is that air is getting into the system slowly.
Head scratch - hair loss?? It really should be fluctuating temps at gauge too if so but maybe not.
Ok: It's tricky but try to catch this warm but with little to no pressure in system. Squeeze the upper rad hose as an idea of how much pressure is in the system. Now and only with all caution, remove the pressure cap - slow!!!! They can blast coolant at you so use all care not to let that happen or don't even try. What I want to see is a total known pressure release while warm then cap reinstalled and feel that upper radiator hose after restarting the engine. It shouldn't pressure up again any time soon - many minutes to near never while waiting with engine idling. If that pressures up too soon it's an tricky clue that a head gasket is allowing combustion gasses which would act as air into cooling system and the air won't transfer heat even if scalding hot at the heater core.
It's a maybe for a reason for this. It would have to be slow or you would constantly notice low coolant, overheats or quick barfing up coolant at start ups or something whacked. It could be slow enough to allow the vapor yet not enough to overcome the cooling of the engine and when thermostat finally does it's periodic opening self purges effectively and restarts the cycle.
There are testers for gasses in the recovery tank that would be a good idea to have checked. Loren here said NAPA sell test strips or something that I'm not familiar with but would be great if so.
The hair loss is that most gasket issues would be worse than what's happening??
~~~~~~~~~~~~~`
For now - while just idling and heater on feel the hoses for temp. Find the two heater hoses and one should be warm/hot at least to a control valve in line if they use that way or all the way to firewall. If heat is blowing warm the return would be cooler but shouldn't be cold to the touch. If cold it suggests that all available heat was removed or near none even got to the heater - see the hair falling now?
Changing request from defrost to floor and that having any impact is interesting. Most vehicles will use a blend door to mix air to adjust temp outputs for inside and that is a possible spot for trouble but so far I haven't heard of any in any Hyundai anythings but who knows?
Do some checks. I'll dig into more if you can put up with the exchange. Do keep an eye on coolant level and now knowing the 50 mile commute I suggest you carry some extra with you for now.
I'm with you and other are always welcome to jump in,
T
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