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Radiator fan motor will not work unless hooked directly to battery? Low coolant light is on. 1996 Lumina

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Faulty relay or temp switch,check for leaks change coolant level sensor

Posted on Oct 01, 2009

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Why is my1997 chevy lumina low coolant light is on and the radiator is full of coolant ?

In most newer chevys, the coolant reservoir is part of the pressurized system. Rather than just holding overflow coolant and relying on the radiator pressure cap to draw from and expel to the reservoir, it is an active part of the cooling system. On these systems, there is a coolant level switch in the reservoir. This will activate if the level in the reservoir gets below a certain point. So it is possible to have a full radiator and still get a low coolant light. Be advised that as the reservoir ages and get stained, it is not uncommon for the low coolant sensor to give false indications of low coolant.

Sep 06, 2014 | 1997 Chevrolet Lumina

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Coolant light come on which indicates an overheating condition

You can never run water in the system, water will boil. You must have a 50/50 coolant/water.

Have the system flushed, the radiator can become restricted from old coolant, the fins have very small ports for flow and can become blocked leading to less cooling.

No thermostat means full flow, so this should not be running hot.

Usually the only way a water pump goes bad is when they leak, they are a direct drive, and the propeller never wears out unless at some point someone had to high of a coolant mixture.

Get the system flushed to clean it and have it made into a 50/50, can't have mostly water, coolant dissipates the heat.

If flushing does not help, the cheapest first thing is a new radiator, or get a new core for it, that's cheaper.

Apr 03, 2013 | 1998 Chevrolet Lumina

2 Answers

Electric fans do not work. Fuses OK Motors also run if hooked up directly.

If the fans work when hooked up directly. this indicates that the fan motors are okay. The next step is to check if the coolant temperature sensor (usually located near the thermostat housing) to see if it sending a signal to the relay when the engine temperature goes above normal. This part is inexpensive and easily replaced; throw one in if you still have the original. A second sensor (or switch) may need to be checked; this is the radiator fan switch. These two usually work as a "team" in managing engine temperatures; one switch tells the computer and the instrument gauge what temperature your engine is operating in, while the other responds by sending a signal to the radiator fan relay to "kick on" the fan.

Lastly, the radiator fan relay itself may have burned out. I usually try to switch out identical relays to determine if this is the problem.

Hope this helps.

Have a Nice Day !!!

Apr 15, 2011 | 1996 Ford Windstar

1 Answer

My 1996 grand prix started to register cooling temp of over 210 degrees. the motor doesn't seem to be overheating. I've replaced the water pump, thermostat, temp sensor, both fan relays, low coolant...

I would first check the cooling fans. To do this unplug the fans and use two jumper wires to hook them direct to the battery and test. If the fans are working I would have the radiator cleaned or purchase a new one. To clean the radiator take it to a professional and tell them you would like it rodded out. You can purchase a new one for about twice the price. I wouldn't worry about the low coolent sensor. By it being on it will not send a message that your vehicle is overheating. If you have changed everything that you say you have and the fans work and radiator is cleaned you may have a blown head gasket. If you have a blown head gasket you would see steam comming out of the tail pipes or water in the oil on dip-stick. Good luck.

Feb 20, 2011 | 1996 Pontiac Grand Prix

1 Answer

How do I remove & replace radiator on 1991 Lumina?

GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996
  1. Disconnect the negative battery cable.
  2. Remove the air cleaner, mounting stud and duct.
CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or inPuddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old. To avoid being burned, do NOT remove the thermostat housing cap while the engine is at normal operating temperature. The cooling system will release scalding fluid and steam under pressure if the cap is removed while the engine is still hot.
  1. Properly drain the engine cooling system into a suitable container.
  2. Remove the coolant recovery reservoir.
  3. Remove the engine strut brace bolts from the upper tie bar and rotate the struts and brace rearward.
To prevent shearing of the rubber bushing, loosen the bolts on the engine strut before swinging the struts.
  1. Remove the air intake resonator mounting nut, upper radiator mounting panel bolts and clamps. Tighten to 89 inch lbs. (10 Nm).
  2. Detach the cooling fan electrical connectors.
  3. Remove the upper radiator mounting panel with the fans attached or the fan assembly, as applicable.
  4. Disconnect the upper and lower radiator hoses.
  5. Detach the low coolant sensor electrical connector, then remove the sensor, if used.
  6. If equipped, remove the automatic transaxle cooler lines from the radiator.
  7. Unfasten any necessary retainers, then remove the radiator.
To install:
If a new radiator is being used, transfer all necessary fittings from the old radiator to the new one.
  1. Position the radiator into the lower insulator pads
  2. If equipped, attach the automatic transaxle cooler lines to radiator.
  3. Install the low coolant sensor and attach the electrical connector.
  4. Connect the upper and lower radiator hoses and secure with the clamps.
  5. Install the upper radiator mounting panel with the fans attached or install the fan assemblies. Tighten the fan mounting bolts to 53 inch lbs. (6 Nm). Connect the fan wires
  6. Install the mounting panel bolts and clamps. Tighten the bolts to 89 inch lbs. (10 Nm).
  7. Install the coolant recovery bottle.
  8. Swing the engine strut to the proper position and tighten the bolts.
  9. Refill the engine with the specified amount and type of engine coolant.
  10. Install the air cleaner, then connect the negative battery cable.
  11. Start the engine and check for coolant leaks.

Hope helps with this (remember comment and rated this).

May 28, 2010 | 1991 Chevrolet Lumina

1 Answer

What do i do if my heater doesnt work on my lumina

It will depend on the symptoms.
If there's no fan, check the fuses.
If there's low heat and you hear gurgling in the water lines to the heater, chances are that the coolant level is low in the radiator,....when the motor cools, add coolant.
If neither of these suggestions helps, you may want to check the heater control valve, to make sure it's functioning correctly.

Dec 09, 2009 | 1991 Chevrolet Lumina

1 Answer

Cooling fan is not working

If you have not checked it yet, you can do so, around the lower right corner of the fan motor is the electrical connection. Us 2 jumper wires and connect directly to the hot and neg post of the battery, if the fan does not work, replace the fan motor. do this for both sides, this should give you which direction you will need to go. If the motor is good, check the fuses (the one in the engine compartment). the coolant temperature switch, the radiator relay, and lastly the condenser fan relay. I hope this helps you, Good Luck!

Sep 25, 2009 | 1996 Honda Civic

2 Answers

1996 chevy cavelier 2.2L engine overheating

you need to bleed the coolant through the radiator tube. there is a bold on the bottom steel line on the driver side of the motor back it out but not all the way and then fill your radiator until antifreeze comes out of the hole on that line. make sure it is a steady stream before tighten it up

May 24, 2009 | 1996 Chevrolet Cavalier

1 Answer


that's the coolant level sensor. that coolant level light will stay on if it isn't installed.

May 06, 2009 | 1992 Chevrolet Lumina APV

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