Question about 1999 Chevrolet Malibu

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1999 chevy malibu overheating have a leak but can't find where it is coming from, and fans don't come on to cool down engine..help

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If you are loosing coolant, you need to find out where. If nothing is coming out externally, then it has to be going inside. If you have a cracked cylinder head or blown head gasket, you can diagnose this by having a hydrocarbon test done at radiator. If you do, that can explain the fan problem as exhaust can drive coolant down below the sensor...no sensor reading...no fan.
You also need to check the fan relay and fan itself (fan quick check is to hot wire it to battery...if it runs, it's OK) Most manuals run through the test procedures you need...get one and do some testing.

Posted on Jul 30, 2009

  • cmustacchio Jan 12, 2011

    I am having the same problem and mine failed the chemical block test. I was told it could be an intake leak or blown head gasket.

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Overheating car


You may need a scanner to proceed - - is the cooling fan coming on at 230 degrees and does it cool down the engine to normal (200 degrees) ?

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My 1999 Chevy Malibu is losing the coolant though the overflow hose by the resevior I've had my head gaskets replaced there is no overheating no water oil mix, but my radiator fans arent working I


Sounds like you need to disconnect the Radiators' electric fans and have them tested. You absolutely must have them working, or your car will overheat. Check to see if the Temperature guage is working.

You need to go to a good autoparts store and have them test the fans and charge and test your battery. You may need some sensors to activate the Radiator fans, but you could be running the battery down with shorted cooling fans.

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My 1999 Chevy Malibu runs hot? It started when it overheated. We changed the thermostat, then water pump, then temp sensor gauge and the temp gauge goes high but only when the heater stops blowing hot...


Air pockets will make the guage do that, and also cause your heat to come and go. Also, a poor radiator, as in rotting, or plugged up, will cause high temperature issues.

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1999 grand voyager IS overheating. Randomly, it seems. Short trips, and quickly. AND longer trips. Then, sometimes, it will cool down without further intervention from me. It SEEMS the fans don't come...


Engine quickly overheating is often caused by a stuck closed thermostat. However, in your case since the fans don't come on, the most likely culprit is a bad fan speed controller. These are variable speed fans controlled by the speed controller. They fail when rust forms on the mounting/cooling area where the controller is mounted. This is an electronic device that has a heatsink on the back. When rust forms it can't dissipate heat and that burns out the controller. See the post below for more information on how to replace it.
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1 Answer

My 1999 Chevy malibu keeps overheating even when the heater is on what is the problem?


You may have a radiator leak. Or your coolant level is low. Using the heater is not a solution to an overheating vehicle. You can usually smell coolant and see the leak. Often times a gasket can leak mixing engine oil and coolant, decreasing effectiveness of both sytems. Check color of fluids make sure the cooloant is viscus and not sludgy.

Also check coolant fan electric connections and fuses. The fan really cools down the engine moreso than coolant. It should kick on when your engine reaches a certain temp. If it does not the vehicle will overheat.

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3 Answers

2002 malibu runs hot.


Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE

Jun 22, 2010 | 2002 Chevrolet Malibu

2 Answers

Why am i overheating


Most likely have a bad intake gasket, or clogged radiator. make sure your fans are coming on also.

Jul 23, 2009 | 1999 Chevrolet Malibu

1 Answer

1999 chevy malibu engine keeps over heating, possibly a blown head gasket?


Overheating could be a combo of many thing's.If your thermostat is stuck you will have no circulation which will cause overheating.Also if your eng. has alot of miles your water pump may be in need of replacement.Listen for your radiator fan motor and be sure that's working and also check to see if you radiator is good.If your loosing antifreeze because of a headgasket you will see a white cloud out of the exhuast because it is burning it and sometimes you also get a little in your eng.oil.Using a pressure tester on your coolant system will help to diognos the problem,if you have a leak some where it will not hold pressure.Sign,s of a bad waterpump are poor circulation and a antifreeze leak from a vent on the waterpump.Be sure the eng. is cool before working on it.Hope this was helpfull.

Mar 01, 2009 | 1999 Chevrolet Malibu

1 Answer

2001 chevy malibu- when car starts cooling fans do not come on but then do


your coolant temp sensor on the engine block is probably faulty, however, keep in mind that if it really isn't all that hot outside they may not need to turn on. Once you activate the A/C the fans come on automatically since they have to cool the condensor...

If your car is not overheating do not worry about it.

Aug 29, 2008 | 2001 Chevrolet Malibu

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