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1995 Chevy Lumina Cooling fans

Tiny
TWID
  • MEMBER
  • 1995 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
Engine heats to operating temperature, then will overheat sometimes. When the engine overheats the cooling fans do not come on until the engine reaches about 260 degrees. Also they do not come on when the A/C is turned on. Checked both relays for the cooling fan and the fan is getting good power and ground. Fan will run when hardwired to battery but won't kick on at 220 degrees when its supposed to
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Friday, December 18th, 2009 AT 11:39 AM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, if you unplug the coolant temp sensor and turn on the key, does a fan run?


https://www.2carpros.com/forum/automotive_pictures/170934_lumina_fan_relay_1.jpg



As you can see, the terminals for the red and orange wires, is hot all the time. The dark green wire is ground for coil side of relay, controled by pcm. If your fully obd1 compliant, 12 pin datalink connector, check for codes.
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Tuesday, April 6th, 2021 AT 7:55 PM

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