Question about 1993 Chevrolet Caprice

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Engine light keeps coming on

I thought it might be the o2 sensor so i replaced it, changed the oil& filter, flushed the radiator-new dex-cool,195 thermostst and radiator cap, around town it stays off as soon as i hit the highway or above 55 mph it comes back on, the vehicle runs like a charm otherwise.

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Go to your local auto zone parts store, they have a free service where they will hook your car up to a dianostic computer and tell you what fault code is comming up. Then you can work on the correct problem. Also some cars have more than one O2 sensor, so it could still be a O2 sensor. Get the diagnostic check first. If you don't have a Auto Zone go to Advanced Auto, or start calling the part stores in your area and see if they offer this service, AMMCO offfers this service for free also.

Posted on Jul 18, 2008

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I have a 2000 Jimmy. It appears to have black gunk in the engine coolant area (oil?). I am not sure what to do. Advise please.


Is your oil level low? Do you have an oil cooler going to the radiator? If there is then its possble the cooler is leaking inside the radiator.

Does the cooling system still use Dex-Cool? The S trucks are one of the models that seem to have problems with the Dex-Cool. People would usually see a dark brown mud basically in their cooling system.
If it still uses Dex-Cool then I would sugest draining and flushing the cooling system (including a good flushing of the heater core. Remove the hoses and force water through with a garden hose) and refilling with another coolant/antifreeze.

Aug 28, 2011 | 2000 GMC Jimmy

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2006 tahoe running between 195 to 215 degrees on highway,new thermostat and fan sensor


What is the problem?

215 isn't abnormal in hot weather &
with the A/C on or going up hills !

Blow out & hose out the condenser &
radiator

Thermostat correct,same writing on it as
original

New coolant,clean engine oil, like Mobil 1
full syn,flush power steering & add lubgard,
change transfer & rear diff lubes

Spark Spark Plugs every 3 years

Change front O2 Sensors at 100,000 miles

A/C not overcharged ?

Clean Air Filter?

Use CRC on MAF Sensor

Jun 25, 2011 | 2006 Chevrolet Tahoe

1 Answer

What is oil change schedule for 2007 DTS also transmission fluid change schedule


Your vehicle's engine requires oil meeting GM Standard GM6094M. You should look for and use only an oil that meets GM Standard GM6094M. SAE 5W-30 is best for your vehicle.
The best Brand is 5W-30, Mobile 1 synthetic oil, but you can use Castrol GTX 5W-30, too. It is very important to use only one barand of engine oil.
When the CHANGE ENGINE OIL SOON message in the Driver Information Center (DIC) comes on,
means that an oil change service is required for your vehicle.
If the engine oil life system is ever reset accidentally, you must service an oil change for your vehicle within 3,000 miles (5 000 km), or three months wichever comes first, since your last service.
The maintenace tune ups for this car are scheduled at 25K, 50K, 75K, 100K and so on.
Dealer recomend to change the transmission oil and filter at Maintenace II, at 50K, and the air filter too. Use only DEXRON®-VI Automatic Transmission Fluid.
The dealer sugest to flush the radiator every 75K and use 50/50 mixture with distilled water, and use only DEX-COOL. I recommend to flush every 50K.

Oct 25, 2010 | 2007 Cadillac DTS Sedan

2 Answers

Temperature guage keeps going hot and cold


buy you a new temp sensor from the dealer not autozone,try that,my suburban did the same thing cause i got a cheap piece of **** sensor from az

Jan 05, 2010 | 1997 GMC Sierra

3 Answers

Coolant level low light comes on and coolant level is not low in reserve tank or radiator.


There is a TSB for this problem. Here it is.


Bulletin No.: 04-06-02-007

Date: August 11, 2004

TECHNICAL

Subject:
Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Operation/Check Sensor for Oil Contamination)

Models:
2000-2002 Buick Century, Regal
2000-2001 Chevrolet Lumina
2000-2002 Chevrolet Impala, Monte Carlo
2000-2002 Pontiac Grand Prix
2000-2002 Oldsmobile Intrigue


Condition

Some customers may comment that the low engine coolant level indicator is always illuminated.


Cause

The cause of this condition may be due to engine oil contaminating the coolant. Possible sources of oil contamination are internal engine leaks, improper service procedures, or the addition of some types of anti-leak additives to the cooling system. Once in the coolant, the oil leaves deposits on the level sensor creating an insulating film. This film results in a false activation of the coolant level indicator.


Correction

Diagnose low coolant level system operation and check the sensor for oil contamination using the procedure listed below.


Important: No coolant supplements should be used in GM cooling systems, other than what is approved and recommended by GM. The use of "aftermarket" over-the-counter sealing and cooling supplements may affect the operation of the low coolant level sensor. Discoloration of the coolant recovery bottle is normal and does not necessarily indicate that coolant contamination is present. Flush cooling system only when instructed by this bulletin.

1. Verify that the coolant is at proper level in the radiator and the coolant recovery bottle. If the coolant is low, add proper amount of 50/50 water and DEX-COOL(R) mixture. If the low coolant light operates properly, diagnose the cooling system for loss of coolant as outlined in SI. DO NOT proceed further with this bulletin.

2. Remove the low coolant level sensor. Refer to Coolant Level Module Replacement in the Engine Cooling sub-section.

3. With the key on, the engine off and the coolant level sensor disconnected from the vehicle wiring harness, observe the low coolant light:


^ Light is on - Chassis wiring or instrument cluster concern. Follow the appropriate diagnostic information in SI.

^ Light is out - Proceed to Step 4.



4. With the key off, connect the coolant level sensor into the vehicle's wiring harness. Connect a ground wire (1) to the battery negative terminal. Using a sharp probe (3) attached to the ground wire, ground the coolant sensor probe (2) as shown in the illustration. Make sure a good contact is made. With the key on and the engine off, observe the low coolant light for at least 15 seconds.


^ Light is on - Replace the low coolant sensor and re-check system operation.

^ Light is out - Proceed to Step 5.


5. Using a small wire brush or emery cloth, polish the low coolant level sensor probe to remove any film or oxidation. The probe should be a bright brass color when finished. Use Brake Parts Cleaner to flush removed deposits from the low coolant sensor probe. Re-install the low coolant sensor into the vehicle and proceed to Step 6.

6. Flush the cooling system and install new DEX-COOL(R) mixture as outlined in the SI. Check the vehicle's warranty history to determine if any engine gasket had recently been changed. If there has not been a recent gasket replacement, locate and repair the source of the engine oil contamination.


Oct 31, 2009 | 2002 Chevrolet Monte Carlo

1 Answer

Same problem , car has only 86,000 miles


replace that thermostat again...flush radiator any way...then see how it runs...

Aug 28, 2009 | 1996 Cadillac DeVille

2 Answers

Radiator replacement


  1. Remove air cleaner and duct assembly.
  2. Drain the coolant.
    1. Remove the engine mount struts.
    2. Remove the cooling fans with the cooling fan shroud.
    3. Remove the radiator upper hose from the radiator.
    4. Remove the radiator lower hose from the radiator.
    5. Disconnect the transaxle oil cooler lines from the radiator.
    6. Remove the radiator brackets and bolts.
    7. Remove the radiator. Installation Procedure
    1. Install the radiator. Notice: Refer to Fastener Notice in Service Precautions.
      1. Install the radiator brackets and bolts.
        • Tighten the bolts to 24 Nm (18 ft. lbs.) .
      1. Connect the transaxle oil cooler lines to the radiator.
      2. Install the radiator upper hose to the radiator.
      3. Install the radiator lower hose to the radiator.
      4. Install the cooling fans with the cooling fan shroud.
      5. Install the engine mount struts. Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL (R) or HAVOLINE (R) DEX-COOL (R) coolant. If Coolant other than DEX-COOL (R) or HAVOLINE (R) DEX-COOL (R) is added to the system the engine coolant will require change sooner; at 50,000 km (30,000 mi) or 24 months.
      6. Fill the cooling system.
      7. Install the air cleaner and duct assembly.

Jun 28, 2009 | 2000 Chevrolet Venture

1 Answer

Re: Dex-Cool in 1999 Lumina


The major reason for using dex-cool is that antifreeze is often neglected as a service item. If neglected, it becomes acidic over time which is particularly important with the use of aluminium in most major components which are served by antifreeze. Acid causes etching and premature failure of gaskets and permanent damage to blocks, heads and especially the radiator and heater core, which are not vert thick to begin with.
Since "normal" antifreeze acidifies faster than does dex-cool, mixing both together causes a change in breakdown rate...the more "normal" coolant added, the faster it breaks down.
Both coolants do not react chemically with each other and therefore retain the same ability to prevent boil over and freezing.
In reality, normal coolant can be used with little or no effect on components, provided that you change it every year. (that's where the EPA gets involved) They do not want people dumping this stuff into the ground, so they push for extended service intervals. Since dex cool has a longer service life, that's what they want you to use.
As far as how you chasnge the coolant, it is always a good idea to flush system during a change, regardless of antifreeze type. This removes solid particles which can plug radiator core. Radiators are much smaller than their older counterparts. Loss of even a small portion of cooling area can cause overheating. Engine running temps are also higher than older vehicles (heat=power output). Therefore most systems have a much smaller margin of error than before. What I find though is that regular flushing can also be bad for the system as the chems eat away at metal components in order to clean. I recommend regualr or dex cool antifreeze systems be flushed with water only, once a year, but retaining what you removed and filtering it through a coffee filter, using it during the year to "top off" the system. To retain effectiveness of coolant, use a hydrometer to check concentration, adding new coolant to bring reading to proper protection level.Then, every three years, do a complete chem flush and change entire batch. This keeps your system clean and the epa happy!

Dec 17, 2008 | 1999 Chevrolet Lumina

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