Question about 1999 Chevrolet Cavalier

1 Answer

I have a 99 cavalier that is overheating.

I have changed the sensor on the thermostat, the thermostat, and the water pump. As long as the air conditioner is running my car stays cool. When i dont have the air conditioner is not on the fan wont kick on until it gets to hot! Is it the fan? Or could there be another problem?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Chevrolet Master
  • 6,982 Answers

Check your temperature sending unit plug and wiring. if there is any corrosion it can cause the signal to be out of range...If it's out of range it can delay fan start up. Works like this: sender sends info to the computer, computer sends ground signal to relay, relay completes power to the fan. If the fan works on a/c, then the fan motor is good and does not need testing. A/c bypasses auto control and keeps fan on as long as compressor is running.
Also, you can have the system tested using a heat sensing "gun" Your gauge may be off a little on the high side. Unless it is actually overheating, there may not be any problem at all.
The gun test can also detect "cold spots" on the radiator which indicate a flow problem. That too can cause your symptom. Don't forget your radiator is ten years old and likely is nearing the end of it's service life. Internal blockage of core passages is common on older radiators.
As long as you have no external leaks and engine internal gaskets are good, something here has got to help!
Good luck!

Posted on Sep 11, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I'm having overheating problems with my 99 chev. cavalier. I have already changed the thermostat and the problem continued. So i went all the way in and got the the water pump off, it seems fine, it...

Hello glongoria8 and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 1999 Chevrolet Cavalier, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people like you. So here is the link to:
How to diagnose your overheating Chevrolet Cavalier engine

Anyways if that helps you any little bit, then feel free to follow me on Twitter. That one is at:

Thanks for the vote, and good luck!

Nov 14, 2010 | 1999 Chevrolet Cavalier

1 Answer

My 99 cavalier is overheating i have changed head, gasket, radiator, fan, and have no thermostat, is it absolutely necessary to have one in the system

During the summer, you can run without a thermostat without any significant problems. In cold weather however, having no thermostat will prevent your car from warming up to normal operating temperature in a reasonable period of time, which will put additional stress on the engine and reduce your gas mileage substantially. You will also get virtually no heat to the passenger compartment. Two things you should check in regards to overheating: Is your water pump working and does your radiator fan switch on when the temperature rises above @190 degrees? If the vehicle has over 100,000 miles on it, you might as well replace the pump now. Don't use a rebuilt pump. They are ****. Get a new pump and a good quality thermostat. If the fan doesn't come on when it should, you probably need an new fan switch/sensor. These are inexpensive and easy to replace. Also check for signs of damage to the wiring leading to this sensor, and check the fan fuse and relay. Finally, make sure that your antifreeze mix is no more than 70% antifreeze to water for winter weather, or 70% water to antifreeze in summer. 50/50 is a good bet for year-round reliability, but a higher % water will tend to cool the engine more efficiently. Having said all that, I suspect your water pump is the main problem. If you notice a slow drip of coolant near the pump, you can be almost certain it has failed.

Dec 19, 2009 | 1999 Chevrolet Cavalier

1 Answer

1996 Chev Cavalier is over heating even after i changed the thermostat but the radiator isn't getting hot

Overheating can be a mystery-but I find that most of this problem is putting in the thermostat backwards, and/or not getting all the air out of hoses(upper and lower)-posible that water pump is shot, and or fan belt that drves pump is no good(unless driven by timing belt)-flush radiator to make sure that isn't clogged up...

Nov 08, 2009 | 1996 Chevrolet Cavalier

1 Answer

99 grand am gt overheating changed thermostat and

try priming the engine block & radiator with water though the hose's & any hose you can squeeze to pump out the air lock with the filler cap off when running, sounds too much air is is in the system & the pump won't work dry.
I had this problem a few times & I ended up practically forcing water into any hose I could re-attach quickly using a garden hose, as the heating system need's priming too !

Sep 21, 2009 | 1999 Pontiac Grand Am GT

2 Answers

Engine overheating

Sometime a car will overheat it there is air int he system. You can buy a resivor that will screw tot he top of your radiator that is made for burping the system. This can be found at your local auto parts store.

May 16, 2009 | 1999 Chevrolet Malibu

1 Answer

Heating Problem

Air would of come out if it overheated, it would of most likely been forced out into the overflow tank. have the water in the radiator tested to see if you have a blown head gasket.

Mar 23, 2009 | 1994 Chevrolet Cavalier

1 Answer

99 expedition front heat blows cold and it overheats...I have changed the thermostat, water pump, and a new radiator...any suggestions?

make sure that there are no air pockets in the cooling system this can cause cold air and overheating. if this doesn't work you might have to replace the water pump.

hope this helped
best of luck
please rate well

Mar 04, 2009 | 2001 Chevrolet Blazer

2 Answers

99 cavalier overheats

check the coolant for hydrocarbons as that will comfirm the headgasket problem all those symptoms would indicate..

Jan 15, 2009 | 1999 Chevrolet Cavalier

Not finding what you are looking for?
1999 Chevrolet Cavalier Logo

314 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

79865 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides