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Flucuating temp guage problem

Tiny
PMP
  • MEMBER
  • 1998 HONDA CIVIC
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 151,000 MILES
Hello, I have this ongoing problem and I dont know what to do and im sick of it already. The cooling system is flucuating and if I let the car sit and idle the fan comes on normally. If I take it for like a 20 minute drive then get to a light or a drive thru the temperature guage rises until a certain temp. (I brang it to a shop and they said it was the fan switch so I changed it and I still have the same problem. They also said the fan isnt coming on till 260. I also have a 1-3 minute video of me parked and what the guage does and where in the guage the fan turns on. What else could it be?
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Monday, June 11th, 2012 AT 2:45 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try replacing your coolant temp sensor it's on the right rear of cyl head
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Wednesday, April 7th, 2021 AT 12:11 PM
Tiny
PMP
  • MEMBER
  • 177 POSTS
Is there any way to test it with a volt meter
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Wednesday, April 7th, 2021 AT 12:11 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You can test to see if there is volts going to it and out but that's about all. You can measure ohms-resistance it shold be at 0 degrees 5000 ohm 104d-1000 ohm176d-500 ohm. This could be aconnection problem or a ground wire loose in dash maybe. If yo have one of those infrared temp gauges, see what it reads when your fan kicks on
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Wednesday, April 7th, 2021 AT 12:11 PM

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