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My thermostat is fluctuating drastically, I.

Tiny
HYUNDAIXG350L
  • MEMBER
  • 2004 HYUNDAI XG350
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
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Sunday, February 24th, 2013 AT 5:17 PM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Sunday, February 24th, 2013 AT 5:21 PM
Tiny
HYUNDAIXG350L
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  • 5 POSTS
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
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Sunday, February 24th, 2013 AT 5:29 PM
Tiny
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
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Sunday, February 24th, 2013 AT 5:34 PM
Tiny
HYUNDAIXG350L
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  • 5 POSTS
Can I do a leak test myself or I have to go to a shop?
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Sunday, February 24th, 2013 AT 5:46 PM
Tiny
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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
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Sunday, February 24th, 2013 AT 5:47 PM
Tiny
HYUNDAIXG350L
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  • 5 POSTS
Ok great
someone told me it may be my water pump and they are expensive
.

Could that also be the problem?
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Sunday, February 24th, 2013 AT 5:51 PM
Tiny
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Not really no issues with impellers on these pumps.

Start with the test first before assuming anything

Roy
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Sunday, February 24th, 2013 AT 5:53 PM
Tiny
HYUNDAIXG350L
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Ok thanks
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Sunday, February 24th, 2013 AT 5:59 PM
Tiny
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Good luck
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Sunday, February 24th, 2013 AT 6:00 PM

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