Question about 1999 Chevrolet Cavalier

2 Answers

I have a 99cavalier i just had a used motor put into it.. 2 day of driving it the check engine light came on and now when im stopped it blows cold air and when im goin its really hot can this be the thermostat?

Posted by on

  • Jeffrey Turcotte
    Jeffrey Turcotte Mar 25, 2011

    afraid you have a blown head gasket. Combustion gasses leak into cooling system and form a bubble that stops the flow to the heater core until you step on the gas and pressure blows bubble out of the way.

  • tlf070206 Mar 25, 2011

    ok well let me throw another one at you... the o2 censor on the front of the engine was unpluged.. i pluged it in and then the car wouldn't start?????



2 Answers

  • 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
  • 8,841 Answers

Sensor may be shorted. test o2 sensor as follows:

i have a 99cavalier i - jturcotte_1317.gif
Heated Oxygen Sensor

See Figures 3 and 4


Fig. Fig. 3: Typical heated oxygen sensor diagram

WARNING Do not pierce the wires when testing this sensor; this can lead to wiring harness damage. Backprobe the connector to properly read the voltage of the HO2S.

  1. Perform a visual inspection on the sensor as follows:
    1. Remove the sensor from the exhaust.
    2. If the sensor tip has a black/sooty deposit, this may indicate a rich fuel mixture.
    3. If the sensor tip has a white gritty deposit, this may indicate an internal anti-freeze leak.
    4. If the sensor tip has a brown deposit, this could indicate oil consumption.

All these contaminates can destroy the sensor, if the problem is not repaired the new sensor will also be damaged.
  1. Reinstall the sensor.
  2. Start the engine and bring it to normal operating temperature, then run the engine above 1200 rpm for two minutes.
  3. Turn the ignition OFF and disengage the H02S harness connector.
  4. Connect a test light between harness terminals A and B (refer to graphic). With the ignition switch ON and the engine off, verify that the test light is lit. If the test light is not lit, either the supply voltage to the H02S heater or the ground circuit of the H02S heater is faulty. Check the H02S wiring and the fuse.
  5. Next, connect a high impedance ohmmeter between the H02S terminals B and A (refer to graphic) and verify that the resistance is 3.5-14.0 ohms.
  6. If the H02S heater resistance is not as specified, the H02S may be faulty.
  7. Start the engine and bring it to normal operating temperature, then run the engine above 1200 rpm for two minutes.
  8. Backprobe with a high impedance averaging voltmeter (set to the DC voltage scale) between the oxygen sensor (02S) and battery ground.
  9. Verify that the 02S voltage fluctuates rapidly between 0.40-0.60 volts.
  10. If the 02S voltage is stabilized at the middle of the specified range (approximately 0.45-0.55 volts) or if the 02S voltage fluctuates very slowly between the specified range (02S signal crosses 0.5 volts less than 5 times in ten seconds), the 02S may be faulty.
  11. If the 02S voltage stabilizes at either end of the specified range, the PCM is probably not able to compensate for a mechanical problem such as a vacuum leak or a faulty fuel pressure regulator. These types of mechanical problems will cause the 02S to sense a constant lean or constant rich mixture. The mechanical problem will first have to be repaired and then the 02S test repeated.
  12. Pull a vacuum hose located after the throttle plate. Voltage should drop to approximately 0.12 volts (while still fluctuating rapidly). This tests the ability of the 02S to detect a lean mixture condition. Reattach the vacuum hose.
  13. Richen the mixture using a propane enrichment tool. Voltage should rise to approximately 0.90 volts (while still fluctuating rapidly). This tests the ability of the 02S to detect a rich mixture condition.
  14. If the 02S voltage is above or below the specified range, the 02S and/or the O2S wiring may be faulty. Check the wiring for any breaks, repair as necessary and repeat the test.

Posted on Mar 25, 2011

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 14 Answers

Feel the upper and lower rad hoses when engine is hot and not running. Also check the antifreeze level, not in the tank but at rad cap. Sometimes these engines get a coolant lock in them and when it finaly bleeds through the coolant is low. If the coolant is ok ( the level) and one hose id hot and the other cold replace the thermostat.

Posted on Mar 25, 2011


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

Last year I bought a 2001 Mitsubishi montero sport. 2 days after purchasing the neutral light started flashing while driving. When we stopped the transmission was completely locked. We then bought another...

Lack of oil from the sound of it ,When checking the auto oil level start engine put handbrake on hard ,couple of bricks behind the drive wheels then drop into reverse ,now check the oil level on the autobox dipstick .If a modern vehicle with no dip stick then dealer only job to check the level

Jun 30, 2013 | Cars & Trucks

1 Answer

'99 Ford Crown Vic LX: #12 30A Maxi fuse blows seconds after starting or ignition turned on.

i had this problem with my 1999 jeep grand cherokee laredo with the brake lights it kept popping fuses right after the ignition was turned on try putting a higher amp fuse in place of the old one that keeps blowing then check for shorts to the starter and check grounds and wires and also the transmission issue check the fluid and then if the fluid is fine change the transmission filter the filter may have not gotten replaced when the transmission was rebuilt and may be clogged or dirty

Oct 04, 2012 | 2002 Ford Crown Victoria

1 Answer

When im driving down the road and stop at a red light/stop sign, my air conditioner doesnt do anything. when i take off and driving, it puts col cold air out but not blowing though. is this a fuse or relay...

If the blower is actually not operating i.e. you don't hear the fan motor at all, it is likely a blown fuse. When you stop if the air gets warm, it could be an indication that the system is getting low on freon.

Jun 25, 2011 | Chevrolet C1500 Cars & Trucks

1 Answer

Check engine licht comes on after driving for a few days wat do i look for?

check your thermostat and make sure you have antifreeze 50/50. My 2000 Chevy impala was blowing cold air, but the previous owner had put some radiator stop leak in the radiator that clogged the whole system. I used a garden hose and flushed the heater core and the water pump.

Feb 03, 2011 | 2004 Chevrolet Impala

1 Answer

Ac fan slows after 75-100 miles urban driving.

check resistor if good replace blower motor the bushing is bad causing drag after warming up

Sep 13, 2009 | 2002 Dodge Grand Caravan

1 Answer

2002 audi a4 1.8t heat problem.

most likely a air bubble in your system. get it up to temp open up your reservoir use something that will fit in the opening and put coolant into it rev engine up a bit until you see bubbles coming up. when you did the engine did you replace cooling system parts like t-stat or water pump? purging the system of air will take a little while good luck hope that helps

Sep 04, 2009 | 2002 Audi A4

1 Answer

A/c stopped blowing cold air / check engine light came on

You need to have a computerised diagnostic done here.This will give you an error code from which you can find out the cause of this fault.The air cond is a different problem here.

Aug 25, 2009 | 2006 Saturn ION

3 Answers

Front air blows cold, rear air blows warm

I believe the rear A/C - HEATER unit is located under the right rear trim penel. Open the rear hatch and remove inside trim panel on your right side. There you will find an evaporator core and a heater core and a blower motor. Also an expansion valve / orfice tube. Have someone turn the HOT/COLD knob while you look at the motor that opens and closes the temp door located in the evap/heater box for the rear A/C-HEATER. This "motor" doesn't really look like a motor persay. It is about 1 1/2 inches thick and 3 or 4 inches square. If you look at the center of the motot there will be a white round piece of plastic that should be turning one way for heat and the other way for cold. If it's not turning check the plug with a test light to make sure you have power. These things are made of plastic and breake all the time. So if it is turning and you hear it "clicking" then the teeth are stripped or the gear is broken. The motors are not that expensive.(I guess because they breake alot). Hope this helps.

Apr 28, 2009 | 1995 GMC Suburban

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

340 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

81285 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