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1991 Buick Park Avenue cooling fan

Tiny
MAXAWALL
  • MEMBER
  • 1991 BUICK PARK AVENUE
Engine Cooling problem
1991 Buick Park Avenue 6 cyl Two Wheel Drive Automatic

My cooling fans do not come on when engine temperature comes up. I run a jumper and they run. Where and what should I check next? Thanx
Tuesday, August 3rd, 2010 AT 10:30 AM

9 Replies

Tiny
SATURNTECH9
  • MECHANIC
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First of all thank you so much for your donation.I need to know what your 8th digit of your vin is. Let me know what it is so I can help you.
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Tuesday, August 3rd, 2010 AT 10:49 AM
Tiny
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8th digit of vin is L
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Tuesday, August 3rd, 2010 AT 11:13 AM
Tiny
SATURNTECH9
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https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_high_low_switch_1.jpg


If your a/c work's turn it on does your fan come on?If your a/c doesn't work then locate your a/c high low switch turn on your a/c and unplug the high low switch jump across the two terminals the a/c should kick on and so should the fan did it?Let me know this will test the wiring relay fuse's fan motor make it a lot easier to figure out.I posted a diagram of where the switch is.
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Tuesday, August 3rd, 2010 AT 3:28 PM
Tiny
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To make sure, we are talking about the fans on the radiator, correct. I jump the wire as you said on the switch and the a/c did come on, but the (radiator fan) did not. The a/c fan works.
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Tuesday, August 3rd, 2010 AT 4:31 PM
Tiny
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The a/c doesn't seem to get as cold as it should unless I run a jumper from the (radiator) fan to the battery.
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Tuesday, August 3rd, 2010 AT 4:34 PM
Tiny
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https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_testing_the_coolant_temp_sensor__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_testing_the_coolant_temp_sensor_part2__1.jpg


Lets do this i posted where your coolant temp sensor is there should be a yellow wire and a black wire going to it.I also posted a resistance chart for the sensor see if the resistance value matches with the actual coolant temp.Use a ohm's meter also while it's running jump the coolant temp sensor connector terminals together and see if the radiator fan come's on.Let me know what you find.
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Tuesday, August 3rd, 2010 AT 5:45 PM
Tiny
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I went ahead and replaced the coolant temp sensor and it did not make the fan work. I did run a jumper on the connector to see if it made a difference. It did not, but I could hear a clicking sound on the firewall ( relays I assume) when I jumped the sensor connector terminals.
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Tuesday, August 3rd, 2010 AT 9:35 PM
Tiny
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https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_relays_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part1__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part2__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part3__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part4__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part5__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part6__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part7__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part8__1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part9_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part10_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part11_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part12_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part13_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part14_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part15_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part16_1.jpg



https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_coolant_fan_inop_trouble_tree_part17_1.jpg


Alright now Lets do this i posted a trouble tree for you to follow.Let me know what you find.
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Wednesday, August 4th, 2010 AT 2:21 PM
Tiny
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https://www.2carpros.com/forum/automotive_pictures/416332_1991_buick_park_ave_dlc_1.jpg


Sorry forgot to post this earlier it goes with the above trouble tree.
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Wednesday, August 4th, 2010 AT 3:32 PM

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