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1998 Other Saturn Models Fan runs at slow speed

Tiny
PALADIN002
  • MEMBER
  • 1998 SATURN
  • 4 CYL
  • 2WD
  • MANUAL
  • 216,000 MILES
Hello,
My Saturn is overheating when running the air conditioner. I have replaced the temp sensor and the fan motor recently. All of the fuses are fine and the relay appears fine too. The fan runs at high speed for a few seconds when turning on the air conditioner but then slows down and runs at low speed allowing the motor to overheat. If I have no air conditioner on the fan kicks on at high speed before reaching the red on the temp gauge and cools the engine down.
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Sunday, August 3rd, 2008 AT 5:49 PM

9 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be a problem with the computer control of the relay-see below


https://www.2carpros.com/forum/automotive_pictures/12900_mx62_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_mx6_1.jpg

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Sunday, August 3rd, 2008 AT 6:17 PM
Tiny
PALADIN002
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  • 6 POSTS
From this diagram I can't see how the Air conditioner effects the radiator fan. I appears in this diagram the temp sensor is working properly with the control module. Do you have any other suggestions?
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Sunday, August 3rd, 2008 AT 7:44 PM
Tiny
PALADIN002
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  • 6 POSTS
I also don't see where there could be 2 speeds of the radiator fan. Thanks ahead for your reply
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Sunday, August 3rd, 2008 AT 7:47 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Sir, which fan are we dealing with and do you have 2 fan motor-perhaps the engine temperature gauge switch is involve here.

Some system uses the coolant temperature sensor to activate the condenser fan and the engine temperature gauge switch is for the radiatorfan. In your system it doesn't show a control module controlling the speed of the fan/s
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Monday, August 4th, 2008 AT 2:41 AM
Tiny
PALADIN002
  • MEMBER
  • 6 POSTS
It just has one radiator fan motor. This is the motor that slows down. It is very easily removed. The temp gauge and the coolant temp sensor are the same device. I know on the older models they are separate. (I have a 1993 Saturn also) I didn't think it would have different speeds either. But when I start the air conditioner it blows on high the it slows down after a few seconds. The motor seems to slow down it's idle too. This is the same problem I had when I replaced the fan motor to begin with. It seemed to work fine for a while after that. Could it possibly be the new fan motor or maybe somehow when the air conditioner is turned on it draws power and causes the motor to slow. It still blows on high when the motor gets hot and cools it down. It will not do this with the air conditioner on. I appreciate your time helping me.
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Monday, August 4th, 2008 AT 11:13 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
New fan motor? Or maybe there's an idle up solenoid valve that's acting up. Its job is to increase RPM when compressor engages when command by the computer.
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Monday, August 4th, 2008 AT 11:32 AM
Tiny
PALADIN002
  • MEMBER
  • 6 POSTS
It sounds like we are getting closer :) Thanks. Yes I mentioned in my first post I had recently replaced the fan Motor. Where would the solenoid be? On the throttle body?
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Monday, August 4th, 2008 AT 11:45 AM
Tiny
RASMATAZ
  • MECHANIC
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Where would the solenoid be? On the throttle body?

Sir-I'm using Mit1 references couldn't come up with that info-this is where were stuck-But gonna keep on digging whether it exist and get back with you.
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Monday, August 4th, 2008 AT 11:49 AM
Tiny
PALADIN002
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Thank you so much for you time, sir.
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Monday, August 4th, 2008 AT 4:03 PM

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