Cooling fan will come on at the right.

Tiny
GARRETTLEMIEUX
  • MEMBER
  • 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 Replies

Tiny
GARRETTLEMIEUX
  • MEMBER
  • 3 POSTS
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
  • MECHANIC
  • 48,601 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
  • 3 POSTS
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
  • MECHANIC
  • 48,601 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
212Â (100) 177
194Â (90) 241
176Â (80) 332
158Â (70) 467
140Â (60) 667
122Â (50) 973
113Â (45) 1188
104Â (40) 1459
95Â (35) 1802
86Â (30) 2238
77Â (25) 2796
68Â (20) 3520
59Â (15) 4450
50Â (10) 5670
41Â (5) 7280
32Â (0) 9420
23Â ( 5) 12,300
14Â ( 10) 16,180
5Â ( 15) 21,450
4Â ( 20) 28,680
22Â ( 30) 52,700
40Â ( 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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