Question about 2003 Chevrolet Blazer

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4.3 liter won't gain temp, why?

Changed thermostat three times this month, changed radiator, vehicle has 13 psi coolant pressure. changed for dex cool to regular anti freeze. hottest temp is about 155. heater core lines with in 10 degrees of each other

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  • jeff_capito Jan 19, 2009

    from a infrared on heater core lines and a regular thermometer placed in radiator.

  • jeff_capito Jan 20, 2009

    thanks i've flushed heater core myself with store kit, time for professional shop. t stat removed tested correct but fan may be part of problem, thanks both ur answer were where i was leaning. thanks for timely answers!!!

  • gasitjr May 11, 2010

    Is this a reading from the gage in the instrument panel or actual from a digital or infrared?

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I agree with mosthated357's post but i still would like to see that outlet temp at the t-stat/radiator in/heater core in closer to 190 degree F! This is a long shot here seeing how you changed the t-stat out 3 times already but have to ask ;are the t-stats rated at the correct opening temp?,are they the same brand and/or batch and/or standard/premium style, it was not so long ago I changed out a wheel bearing for an ABS issue 3 times in a month because of a defective batch from 2 diferent parts supliers! Turns out same company made them for both. Go figure! Bear with me here as here's another long shot in the dark but, Is the radiator fan clutch locking up to soon and over cooling the system?! good luck!

Posted on Jan 19, 2009

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Hello,

The chevy blazers are known fior heater core issues clogged going bad etc... The reason im saying this is because the only reason i could see you having a problem with the temp not getting hot enough is because then your heat in your car isnt getting hot or its taking super long to get luke warm, is that correct? If so 9 times out of 10 its a bad heater core...

Thanks,
Steve

Posted on Jan 19, 2009

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Temp guage running low. Only about 1/4 when it shoud be about 1/2???


Before you replaced parts did you feel the upper radiator hose ,as close to the engine as possible , From a cold start you would be able to tell if thermostat was opening ,by change in temp ! Check heater hose's going through the fire wall to inside vehicle . When vehicle is warmed up are both hose's hot to the touch ? I would suspects the temp . gauge before the coolant temp. sensor , Because I know GM has had problems with the stepper motors that control the gauges .
The instrument panel cluster (IPC) displays the engine coolant temperature (ECT) as determined by the engine control module (ECM) or the powertrain control module (PCM). The IPC receives a class 2 message from the ECM/PCM indicating the ECT. The range on the ECT gage is between 60-125?°C (140-260?°F). The ECT gage defaults to 60?°C (140?°F) or below if the ECM/PCM detects a malfunction in the ECT sensor circuit. Refer to Cooling System Description and Operation.
Class 2 is a serial data communication network ,found on GM vehicles , Vehicle computers share information on this network .
How's the antifreeze ? does the vehicle still have the original dex-cool antifreeze ? You haven't change the coolant with green coolant ? Dex-cool an regular green coolant don't mix , they gel up clogging heater cores ,passages in the engine block etc...

Jan 10, 2016 | 2006 Buick Rendezvous

1 Answer

How do you bleed the air from the cooling system of a 1999 v6 pontiac grand am


Refilling Procedure




Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL?"¢ coolant. If coolant other than DEX-COOL?"¢ is added to the system, the engine coolant will require change sooner: at 50 000 km (30,000 miles) or 24 months.






  1. Close the radiator drain cock.


  2. If previously removed, install the engine block drain plugs.


  3. When installing the drain plugs, use pipe sealer GM P/N 12346004.




    Important: On vehicles equipped with the 3.4L engine, open the coolant air bleed valve. The coolant air bleed valve is located on the top of the thermostat bypass pipe/heater pipe assembly. Close the valve once a continuous stream of coolant is expelled from the valve.



  4. Fill the surge tank to the base of the filler neck.


  5. Start the engine with the pressure cap off. Run the engine until the upper radiator hose starts to get hot.


  6. If the coolant level in the surge tank is low, add the proper mix of coolant until the level reaches the full cold line.



  7. Important: After servicing the cooling system, and if the vehicle is equipped with an intermittent low coolant light, an occasional low coolant light may be encountered during some extreme driving maneuvers. This complaint should be eliminated by removing the surge tank cap and adding coolant to a level just at or above the full cold line when the system is cold.



  8. Install the cap onto the tank with hand tight pressure.



Recycling Procedure




Important: Dispose of used coolant in a proper fashion, such as in a used coolant holding tank. Never pour used coolant down the drain. Ethylene glycol antifreeze is a very toxic chemical. Disposing of ethylene glycol antifreeze into the sewer system is both illegal and ecologically unsound.



There is currently no approved method for recycling used DEX-COOL?"¢ coolant into new DEX-COOL?"¢ coolant. DEX-COOL?"¢ coolant can be recycled into new conventional coolant. Consult local listings for coolant recycling facilities in your area.

Dec 31, 2015 | Pontiac Cars & Trucks

1 Answer

Want to know whats these codes mean [Engine rpn 704 rpm],[Map sensor 45 kpr], [cool ant temp 141f], [Dtc t caused rreezerrame p1281]. for a 2000 grand cherokee


Hi, the first part is data taken along with the code. The code P1281 indicates the engine is running cold (141 degrees--should be at least 190). Is your temp gage running lower than you are used to? If yes, it may be your thermostat has failed open. I have pasted below instructions for replacing the thermostat. Please let me know if you have any questions, and thanks for using FixYa.


3.7L & 4.7L Engines WARNING Do not loosen radiator drain **** with system hot and pressurized. Serious burns from coolant can occur.


NOTE Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.

  1. Disconnect negative battery cable at battery.
  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Remove splash shield.
  5. Remove lower radiator hose clamp and lower radiator hose at thermostat housing.
  6. Remove thermostat housing mounting bolts, thermostat housing and thermostat.

To install:
  1. Clean mating areas of timing chain cover and thermostat housing.
  2. Install thermostat (spring side down) into recessed machined groove on timing chain cover.
  3. Position thermostat housing on timing chain cover.
  4. Install two housing-to-timing chain cover bolts. Tighten bolts to 115 inch lbs. (13 Nm).
    CAUTION Housing must be tightened evenly and thermostat must be centered into recessed groove in timing chain cover. If not, it may result in a cracked housing, damaged timing chain cover threads or coolant leaks.
  5. Install lower radiator hose on thermostat housing.
  6. Install splash shield.
  7. Lower vehicle.
  8. Fill cooling system.
  9. Connect negative battery cable to battery.
  10. Start and warm the engine. Check for leaks.


Removal & Installation, 4.0 liter engine

  1. Disconnect the negative battery cable.
  2. If necessary, disconnect the coolant temperature sensor electrical connector.
  3. Disconnect the upper radiator hose from the thermostat housing.
  4. Remove the attaching bolts and lift the housing from the engine.
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Remove the thermostat and gasket.
To install:
  1. Clean all gasket surfaces thoroughly.
  2. Place the thermostat in the housing with the spring inside the engine.
  3. Install a new gasket with a small amount of sealing compound applied to both sides.
  4. Install the water outlet and tighten the mounting bolts to 200 inch lbs. (23 Nm) on V-8 engines and 15 ft. lbs. (20 Nm) on non-8 cylinder engines.
  5. Install the upper radiator hose to the housing and tighten the hose clamp.
  6. Connect the coolant temperature sensor connector to the housing.
  7. Refill the cooling system.

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1 Answer

How to remove the thermostat


To cnage a thermostat on your car: Drain coolant, carefully (without damaging radiator) release the engine side of the upper radiator hose. You will find the thermostat under the housing that the radiator hose connected to.

Completely clean ALL gasket material from ALL parts, and use a new gasket and sealer.

Replace coolant, bring unit up to temp, with heater on full, top up coolant and then shut down the vehicle and pressure test the cooling system, look for leaks, and be certain that you can maintain pressure of around 13 pounds.

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2 Answers

I changed the water pump and the thermostat and still have no heat the passengers side front floor does not get wet so i dont beleive that it is the heater core my radiator hoses do not get alot of...


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Drain the cooling system...Do not remove the thermostat...Fill radiator with drinkable water...Turn heat on full...Run engine until thermostat opens...Shut down, let cool then drain...Do this several times until water comes out clean...Replace thermostat...Replace O-rings on thermostat pipe...Coat thermostat bolts with Permatex...Re-fill with Dex-Cool...

Here is Vacuum Diagram...

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Guru.Saailer

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1 Answer

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1 Answer

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I replaced the alternator on my 2003 Range Rover


I Suspect that you have AIR in your COOLING SYSTEM Fallow Procedures BELOW to Insure there is NO AIR IN COOLING SYSTEM


Draining and Filling Cooling System

Draining Procedure

Important: Do NOT add any engine coolant supplement sealant pellets to the cooling system. Drain and refill the engine cooling system every 5 years or 240,000 km, (150,000 mi) , whichever occurs first.

  1. Park the vehicle on a level surface.
  2. Remove and clean the coolant recovery reservoir.
Caution: Refer to Radiator Cap Removal Caution in Service Precautions.

  1. Remove the radiator cap when the engine is cool:
3.1. Slowly rotate the cap counterclockwise to the detention tab. Do not press down while rotating pressure cap. 3.2. Wait until any residual pressure, indicated by a hissing sound, is relieved. 3.3. After all hissing stops, press down on the radiator cap and rotate the cap counterclockwise in order to remove the cap.
Important: Recover and store used coolant in a used coolant holding tank and submit the used coolant for recycling on a regular basis. Do NOT pour used coolant down the drain. Ethylene glycol antifreeze is very toxic. Disposing of ethylene glycol into the sewer system or ground water is both illegal and ecologically unsound.

  1. Place a drain pan under the radiator drain valve in order to collect all of the used coolant.
  2. Open the radiator drain valve located at the bottom of the radiator tank. If only partial cooling system draining is required, drain enough coolant to perform the procedure.
  3. Open the air bleed valve on the thermostat housing 2 full turns
    1. Open the air bleed valve above coolant pump 2 full turns.
    2. Place a drain pan under the engine block drains in order to collect the used coolant.Important: Allow the coolant to drain completely.

      1. Remove both of the engine block drains.
        • The front left engine block drain is located between the starter motor and the engine oil filter.
        • The rear right engine block drain is located near the crankshaft position sensor.
      Filling Procedure
      Reinstall the engine block drains
    3. Close the radiator drain valve,
      1. Install the coolant recovery reservoir. Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL coolant. If Coolant other than DEX-COOL or HAVOLINE DEX-COOL is added to the system the engine coolant will require change sooner; at 50,000 km (30,000 mi) or 24 months.
      2. Slowly add a 50/50 mixture of GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL and clean, drinkable water to the radiator until the coolant level is at the base of the radiator fill neck.
      3. Wait for 2 minutes and reinspect the level of the coolant in the radiator. If necessary, add coolant to the radiator until the coolant level is at the base of the radiator fill neck.
      4. Install the radiator cap.Ensure that the radiator cap arrow points toward the radiator overflow tubeImportant: The air bleed valves are brass. Do NOT over-tighten the air bleed valves.

        1. Close the air bleed valve above the coolant pump.
          1. Close the air bleed valve on the thermostat housing.
          2. Fill the coolant reservoir with a 50/50 mixture of GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL and clean, drinkable water. Caution: Refer to Radiator Cap Removal Caution in Service Precautions. Important: If the coolant temperature indicator turns ON, turn the engine OFF immediately and allow the engine to cool. Do NOT remove the radiator cap.
          3. Start the engine and allow the engine cooling fan to cycle on and off 3 times. If the low coolant indicator does not turn OFF and the coolant level is above the Full Cold mark on the coolant recovery reservoir, refer to Engine Coolant Temperature Gage Inaccurate or Inoperative.
          4. Turn off the ignition.
          5. Allow the engine to cool.
          6. Ensure that the engine coolant concentration is sufficient.

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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!

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1 Answer

Where is the radiator cap on 2001 Olds Alero?


if you dont see a radiator cap then the cap for your resevoir tank also serves as your radiator cap, thats where you would put your radiator cleaner and dex-cool in at. it is pressurized just like a normally radiator is with a normal radiator cap on it so dont open it when its hot! the resevoir cap should also have dex-cool stamped on it

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