Question about Buick Roadmaster

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Where is the themostat switch located on a 94 roadmaster

Overheating. cooling fans wont turn on

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  • Buick Master
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Switch for what?, there are sensors but not a switch.

Posted on Apr 26, 2013

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Posted on Jan 02, 2017

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mcgyver468
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SOURCE: Trying to locate cooling fan relay switch?

Driver's side in the fuse/relay box under the hood.

Posted on Apr 25, 2009

  • 84 Answers

SOURCE: cannot find cooling fan relay

check the owers manual for location usualy in the main electrical box under the hood. they are just a pull out plug with 4 prongs some times 5 pull straight back youll b fine

Posted on Apr 28, 2009

mcgyver468
  • 710 Answers

SOURCE: engine overheating

CHECK TO SEE IF THE FAN RELAY IS FUNCTIONING BY SWAPPING IT WITH ANOTHER LIKE THE WIPER RELAY IF THEY ARE THE SAME. IF THE WIPERS WORK WITH THE A/C RELAY IN IT'S PLACE, THEN TRY REPLACING THE FAN FUSE. IF NONE OF THESE METHODS MAKE THE FAN TURN ON THEN REPLACE THE COOLANT TEMP SENSOR LOCATED NEAR THE UPPER RADIATOR HOSE INLET TOWARDS THE FRONT OF THE ENGINE. HOPE THIS HELPS YOU FIND THE SOURCE OF THE PROBLEM. LET ME KNOW. GOOD LUCK AND THANKS FOR USING FIX-YA.

Posted on May 06, 2009

  • 175 Answers

SOURCE: where is the collant temperature sensor located on

hi..Actually it is on the opposite side of the motor
the thermostat is on the front left and the sensor is
on the back left.
check this out..
thank u..
kindly rate my response..

Posted on Jun 26, 2009

  • 2 Answers

SOURCE: cooling fan switch/or sensor

The Coolant temp Sensor is located right under the top radiator hose (on the engine side), with a little black connector!, You might have to remove th etop hose to get to it with a deep socket and extension!.
Also Dont Forget to blled the coolant system by the bleeder valve uptop right near/above the coolant sensor!.(10MM Mini socket w/ extension IIRC!)

Posted on Sep 28, 2009

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is the car running hot? some cooling fans never come on going down the road because the air comjng through the front of the vehicle keeps the car cool enough that it doesn't need to come on. but if it is overheating then you may want to check the cooling fan relay.

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The fans come on only when hot or the AC is on. There are many fuses that have to be good for it to work. The fan relay should have 2 pins hot with the key on, The other 2 should be ground. with the key off one should be hot and the other can then be ground the other pins that are ground one of them is the fan. the other becomes ground when the computer turns the fans on. If you don't have a pin thats hot at the relay all the time then theres a blown fuse or even the power wire from the battery at the battery

Nov 02, 2009 | 1994 Buick Roadmaster

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Cooling fans will not come on


Hi,

Fan Relay switch is stuck open. This of course assumes your temperature sensor is working appropriately. Which I assumed since you seem to know that the engine is running hot.

Replace the fan relay switch. The relay switch is tripped when the temperature sensor tells the computer the engine is too hot.

Until you get the relay switch replaced, you can either by-pass the relay switch and directly connect the fans to the battery, or turn on your A/C ALL the time and use it at a minimum setting. This will keep the cooling fans running at all times.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

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94 buick roadmaster over heating changed waterpump both relayes both fan motors coolant temp sensor and the guage sensor still fans will not come on if i unplug the coolant sensor both fans will come on...


I feel there is a sort somewhere in the fan circuitry, check its fuse unit. Also ensure proper level of engine oil is present in the engine. Actually your car might be overheating because the respective fans are not powering on at the correct time, but you mentioned that these fans are in working condition so it has to on something in this circuit that is preventing completion of this circuit by their respective sensors which you have recently changed...............sodeep

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Cruise control wont work 94 buick pa


i have a felling its ur cruise control switch might be falty its located on top of the break switch u cant miss it fallow ur break pedal hope it helps

Jan 25, 2009 | 1992 Buick Roadmaster

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1996 buick roadmaster keeps overheating: already replaced the thermostat, water pump, heater core, heater control valve, hoses and anti-freeze


A shotgun approach to repairs can really rack up the bills.

If your symptoms are loss of water and you have replaced the thermostat, you more than likely have an issue with steam. And that steam more than often comes from a bad head gasket. Most head gasket gasket failures seem to be confined to the water side initially, but let it go on bigger damage will occur.
You can buy a litmus test strip to dunk in the coolant. It will indicate if there are exhaust residuals in the water and thus a gasket failure.

However it may just be something simple, given that you have just about replaced everything:

have you given the radiator a good hosing inside and out?
is the radiator fan running when it should be?

Sep 07, 2008 | 1996 Buick Roadmaster

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