COOLING FAN WILL COME ON AT THE RIGHT ...

  • Tiny
  • garrettlemieux
  • 2002 Chevrolet Cavalier
  • 92,800 miles

Cooling fan will come on at the right temperature but will not shut off even when the temp drops below 195 it will get down to half way between the quarter and half mark but engine is definitely not overheating, but this all started after I had the coolant temperature sensor, thermostat, and coolant changed to fresh coolant. And know I noticed my gas mileage is getting a little worse it originally started dropping to a notch below 195 and now it is going even lower but only does it when it is idling or when it first started in the morning?

Saturday, December 8th, 2012 AT 12:16 PM

4 Answers

  • Tiny
  • garrettlemieux
  • Member

Oh yeah forgot to add it will shut off when I shut car off.

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Saturday, December 8th, 2012 AT 12:18 PM
  • Tiny
  • hmac300
  • Expert
  • 41,648 posts

Scan for codes first it may be a bad coolant switch

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Saturday, December 8th, 2012 AT 4:13 PM
  • Tiny
  • garrettlemieux
  • Member

There are no codes and no check engine light I did that already.

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Saturday, December 8th, 2012 AT 10:59 PM
  • Tiny
  • hmac300
  • Expert
  • 41,648 posts

Check resistance using this chart for ect. Then check to see if one of hte relays arestuck in th e on position or power is being supplied to them all the time, you may have a short in the system.
Temperature F ( C) (4) Ohms
212 (100) 177
194 (90) 241
176 (80) 332
158 (70) 467
140 (60) 667
122 (50) 973
113 (45) 1188
104 (40) 1459
95 (35) 1802
86 (30) 2238
77 (25) 2796
68 (20) 3520
59 (15) 4450
50 (10) 5670
41 (5) 7280
32 (0) 9420
23 ( 5) 12,300
14 ( 10) 16,180
5 ( 15) 21,450
4 ( 20) 28,680
22 ( 30) 52,700
40 ( 40) 100,700
(1) Engine Coolant Temperature (ECT) sensor.
(2) Intake Air Temperature (IAT) sensor.

(3) Transaxle Fluid Temperature (TFT) sensor.
(4) Measure resistance across sensor terminals.

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Saturday, December 8th, 2012 AT 11:46 PM

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