2004 Hyundai Xg350 Thermostat Fluctuating Drastically Just Had Replaced Weeks

2004 HYUNDAI XG350
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HYUNDAIXG350L
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my thermostat is fluctuating drastically, I just had it replaced a few weeks ago. Now the heat is blowing cold air, I also noticed my car is stalling when i sit at a long light. I have had 3 diff. mechanics take a look at it but I got 3 different answers. I want to be confident in knowing the problem before paying to get it repaired.

Thanx
Feb 24, 2013 at 5:17 PM
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ASEMASTER6371
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we cannot see or touch it. what were the 3 opinions???

is the check engine light on??

why was the thermostat replaced originally???

did it overheat at any time???

Roy
Feb 24, 2013 at 5:21 PM
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HYUNDAIXG350L
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The check engine light isn't on

the thermostat was replaced because occasionally the temp. gauge would fluctuate now it's ever single time i drive.

I believe its over heating, yes
Feb 24, 2013 at 5:29 PM
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ASEMASTER6371
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first thing is get a leak down test done to verify that the head gaskets are not bad.

beyond that, sounds like air in the system but should have bled off by noe.

Roy
Feb 24, 2013 at 5:34 PM
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HYUNDAIXG350L
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can i do a leak test myself or i have to go to a shop?
Feb 24, 2013 at 5:46 PM
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ASEMASTER6371
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if you have tool to do the test, yes. it would be cheaper to have someone do it for you.

Roy
Feb 24, 2013 at 5:47 PM
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HYUNDAIXG350L
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ok great
someone told me it may be my water pump and they are expensive
.

could that also be the problem?
Feb 24, 2013 at 5:51 PM
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ASEMASTER6371
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not really no issues with impellers on these pumps.

start with the test first before assuming anything

Roy
Feb 24, 2013 at 5:53 PM
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HYUNDAIXG350L
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ok thanks
Feb 24, 2013 at 5:59 PM
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ASEMASTER6371
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good luck
Feb 24, 2013 at 6:00 PM
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