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Engine Fan

Tiny
KELCIE
  • MEMBER
  • 1998 MERCURY MYSTIQUE
  • 4 CYL
  • FWD
  • AUTOMATIC
What causes the engine fan to run at high RPMs in a 1998 mercury mystique? The thermostat in the engine was bad but after I replaced it, I noticed that the engine fan was running constantly at a high rate, and it never shuts off. What could be the problem?
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Saturday, November 20th, 2010 AT 12:38 AM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Check the wiring to the temp sending unit to make sure nothing is shorted or damaged.

Let me know what you find.
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Saturday, November 20th, 2010 AT 12:41 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the high speed coolant fan relay is sticking or the PCM controlled circuit of the relay- try removing fuse no. 2 60amp and see what happens-
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Saturday, November 20th, 2010 AT 12:47 AM

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