MY THERMOSTAT IS FLUCTUATING DRASTICALLY I JUST ...

  • Tiny
  • HyundaiXg350L
  • 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

Sunday, February 24th, 2013 AT 5:17 PM

9 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 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
  • Member

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
  • Expert
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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
  • Member

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
  • ASEMaster6371
  • Expert
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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
  • Member

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
  • ASEMaster6371
  • Expert
  • 25,502 posts

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
  • Member

Ok thanks

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Sunday, February 24th, 2013 AT 5:59 PM
  • Tiny
  • ASEMaster6371
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  • 25,502 posts

Good luck

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Sunday, February 24th, 2013 AT 6:00 PM

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