Thinks it is overheating but it is not

Tiny
CANDACE MESSER
  • MEMBER
  • 2007 PONTIAC TORRENT
  • FWD
  • AUTOMATIC
  • 142,000 MILES
My car's message board shows engine hot/AC off. Then it goes to engine hot/power reduced. A light just blinks and then it reduces power. After driving it home with the light blinking and reducing power, it was not actually hot. Using a heat sensor, the hose coming out of the engine registers only 193 degrees at the highest. The fan is running. Correct engine coolant used and it is not losing any coolant. The cluster sometimes goes haywire. Sometimes it works and sometimes it does not. Is it the heating sensors or is the cluster?
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Wednesday, June 28th, 2017 AT 3:58 PM

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Tiny
STEVE W.
  • EXPERT
Check the ground connections at both sides of the dash panel, also check the connection at the engine coolant temperature sensor. Use a scan tool to check what the ECT is actually reporting as the engine temperature.
If those check out it is possible you have a failing cluster. A good scan tool that can talk on the class 2 bus would show if this is the problem as errors on the network usually show up.
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Wednesday, June 28th, 2017 AT 6:29 PM

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