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Temperature gauge intermittently not working

Tiny
HENDO46
  • MEMBER
  • 2011 VAUXHALL ASTRA
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
  • 35,000 MILES
Noticed temperature gauge not moving above zero and heater only blowing cool air even after travelling twenty miles, sometimes the gauge rises to about forty degrees and the heater blows hot but the gauge will drop to zero and the heater will blow cool again, the gauge used to run at ninety degrees.
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Monday, December 5th, 2016 AT 9:51 AM

6 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,474 POSTS
First thing is to check your coolant level, low coolant could cause this. Next would be to remove and replace the thermostat. If they stick open the engine won't warm up properly.
If you have access to a scan too or even a lower end tool that will read live data it can show you the temperature the coolant sensor is reading.
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Monday, December 5th, 2016 AT 6:22 PM
Tiny
HENDO46
  • MEMBER
  • 3 POSTS
Thanks steve, coolant level is ok, will change thermostat an let you know outcome
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Tuesday, December 6th, 2016 AT 12:56 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
I agree, the thermostat would be the first thing that I would be checking.
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Wednesday, December 7th, 2016 AT 4:33 AM
Tiny
HENDO46
  • MEMBER
  • 3 POSTS
Changed thermostat everything now working as it should, cheers guy, s and thanks for the advice
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Thursday, December 8th, 2016 AT 11:30 AM
Tiny
STEVE W.
  • MECHANIC
  • 13,474 POSTS
No problem, enjoy the heat.
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Thursday, December 8th, 2016 AT 12:38 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Thanks for using 2carpros
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Thursday, December 8th, 2016 AT 11:46 PM

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