So , it was overheating slightly before you changed the water pump an thermostat ? 2000 to 2006 GM Products had problems with stepper motors in the instrument cluster , these stepper motors control the gauge's operation, could have a bad stepper motor ! The only way to tell for sure that it's over heating is hook up a scan tool that can check engine data , Engine coolant temperature data to be precise . If it's up to 223 degrees the engine computer turns on the cooling fans ! Are the cooling fans coming on ? And as far as the air flow out of vents , more then likely a mode door problem . Can you switch the position the air comes out of , defrost , floor , center vents , an is it low air flow in all positions ? Does your temperature light light up on the dash ?
Step
Action
Yes
No
Did you perform the Diagnostic System Check - Vehicle?
Start the engine.
Does the engine coolant temperature indicator illuminate?
With the scan tool, observe the engine coolant temperature parameter in the powertrain control module (PCM) data list.
Does the scan tool indicate that the coolant temperature is within the temperature range shown on the temperature gage?
Replace the instrument panel cluster (IPC). Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?
Operate the system in order to verify the repair.
Did you correct the condition?
TEMP
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The instrument panel cluster (IPC) illuminates the TEMP indicator when the powertrain control module (PCM) determines that the coolant temperature is more than 128?°C (262?°F). The IPC receives a discrete input from the PCM requesting illumination.
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The IPC performs the display test at the start of each ignition cycle. The IPC illuminates the TEMP indicator
Engine Coolant Temperature Indicator Always On
1
Go to Step 2
Go to Diagnostic System Check - Vehicle
2
Go to Step 3
Go to Testing for Intermittent Conditions and Poor Connections
3
Go to Engine Overheating
Go to Step 4
4
Go to Step 5
--
5
System OK
Go to Step 2
A new pressure cap !
Pressure Cap
The pressure cap seals and pressurizes the cooling system. The cap contains a blow off, or pressure valve and a vacuum, or an atmospheric valve:
• The pressure valve is held against the seat by a spring that protects the radiator by relieving pressure that exceeds 15 psi.
• The vacuum valve is held against the seat by a spring that permits opening of the valve to relieve vacuum created when the cooling system cools. The vacuum, if not relieved, might cause the radiator to collapse.
The pressure cap allows the cooling system pressure to build up when the temperature increases. As the pressure builds, the boiling point of the coolant increases. Therefore, the engine coolant can be safely run at a temperature much higher than the boiling point of the coolant at atmospheric pressure. The hotter the coolant becomes, the faster the heat transfers from the radiator into the cooler air.
The pressure in the cooling system can get too high. When the pressure exceeds the strength of the spring, the pressure valve rises, venting the excess pressure.
As the engine cools, the temperature of the coolant drops and a vacuum is created in the cooling system. This vacuum causes the vacuum valve to open. This equalizes the pressure in the cooling system with the atmospheric pressure, preventing the radiator from collapsing.
Coolant Recovery System
The coolant recovery system consists of a plastic coolant recovery reservoir and overflow tube. The recovery reservoir is also called a recovery tank or expansion tank. This tank is partially filled with coolant and is connected to the radiator fill neck with the overflow tube. Coolant can flow back and forth between the radiator and the reservoir.
In effect, a cooling system with a coolant recovery reservoir is a closed system. When the pressure within the cooling system gets too high, the pressure valve in the pressure cap will open. This allows the coolant, which has expanded due to heat, to flow through the overflow tube and into the recovery reservoir. As the engine cools down, the temperature of the coolant drops and a vacuum is created in the cooling system. This vacuum opens the vacuum valve in the pressure cap, allowing some of the coolant in the reservoir to be siphoned back into the radiator. Under normal operating conditions, no coolant is lost. Although the coolant level in the recovery reservoir goes up and down, the radiator and cooling system are kept full. An advantage to using a coolant recovery reservoir is the elimination of almost all air bubbles from the cooling system. Coolant without bubbles absorbs heat much better than coolant with bubbles.
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Check the lower (suction) radiator hose that it cannot collapse, they usually have a metal coil inside to prevent this. If you left this out when installing the water pump it could be the cause..What temperature is the gauge reading? You could have been running too cool before and now that the new thermostat is in its up to normal temperature.
Low airflow through the heater is a separate issue and can be caused by leaves in the ductwork, a blend door not opening/closing fully, clogged heater core (are you a smoker?) Good luck.
Edit: I had another thought on this.. the cooling system needs bled carefully, air in the system can cause symptoms like you describe, look for a bleeder screw on top of the engine somewhere and make sure to let the air out of the system.
The temperature reaches the center line (not sure actual temp) within 5 min after cold start. Then after I drive for about 20 to 30 min it goes just slightly over the center line when I am stopped but goes back to center when I start moving
The air flow didn't do this till after I changed the water pump and thermostat
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SOURCE: how do i change a
Lucky you! I have the same issue with my '06 Impala LT. It is run off the serpentine belt and it is at the top front of the engine. I plan to replace mine next weekend so I'll take notes, and let you know how it is done and what to watch out for. Meanwhile, you can check out this website: alldatadiy.com There is a subscription charge. I also found this link:
http://www.10w40.com/questions/auto-repair-questions/how-to-replace-the-power-steering-pump-on-a-2006-chevy-impala-ls
SOURCE: 2004 jeep grand cherokee overheating.
Are you losing coolant. If you are I would check your heater core which is located under the glove compartment.
SOURCE: car overheating, blows cold air out vents, changed
A couple of things to check because as you describe your symptoms you actually have 2 problems
1. No heat from vents.
Sounds like the heater water flow valve cable is kinked disconnected or the valve itself is stuck You will need to follow your heater core water supply lines to find the valve usually to the right of the center console in the ducting area / large plastic housing for heater and AC internal coils. If the valve works then there is a possibility that the heater core water supply lines have been bypassed on the engine side of the firewall with a coupling due to a leaking heater core. And l;astly the heater core could just be clogged. (quite rare!!)
As for the overheating engine after all of the work you have done.. Perform this simple test.
1. remove radiator cap
2. have someone else start the car
3. watch for water coming out of the open radiator cap area DURING start...
4. have person in the car rev engine gently 2 or 3 times. No need to exceed 2000 RPM. If water rapidly flows out of the radiator during engine revs.. you have some major engine issues.
If it passes all of these checks then the only thing left is improper hose connections on the engine side of the firewall and or a hydraulic water lock in the block that should clear itself by starting and stopping the engine many times with the radiator cap off.
SOURCE: No Heat and Overheating in 1999 Chevy Silverado
After replacing the thermostat, you must bleed the air from the cooling system.
To bleed air from the 2.2L and 2.5L engines, remove the plug or sensor
on the top of the thermostat housing. Fill the radiator with coolant
until the coolant comes out the hole. Since the plug is made out of
steel and the thermostat housing is aluminum, it is a good idea to
apply an anti-seizing compound or Teflon® tape on the plug threads
prior to installation. Install the plug and continue to fill the
radiator. This will vent all trapped air from the engine.
Any trapped air in the heating system will have to be displaced by coolant. Once the cooling system is filled, with the radiator cap off, turn of the heater at it's highest setting. Start the engine and allow it to reach operating temp. You should see a drop in the coolant level as the air in the heating system is displaced by coolant. Add coolant to the proper level and replace the radiator cap.
Keep a close eye on the coolant level for at least the next couple of weeks. The cooling system is a "closed" system. Any significant decrease in coolant level indicates a problem.
If you have any questions, let me know.
Please take the time to rate this solution.
Drive safe and be warm.
clarkco
SOURCE: Overheating 93 Subaru Legacy
water pump could be bad again. if the seal is out lets air in around pump propeller and it won't move water and it over heats. its a lot of work but you can fix it your self
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The temperature reaches the center line (not sure actual temp) within 5 min after cold start. Then after I drive for about 20 to 30 min it goes just slightly over the center line when I am stopped but goes back to center when I start moving
The air flow didn't do this till after I changed the water pump and thermostat
I can tell that it is overheating because when I cut the car off you can hear it boiling into the reservoir
That's normal ! when it cools down it gets dawn back into the radiator. Are the cooling fans running when you shut it off ? If you look at that sticker under the hood near the radiator core support , it tells you the fans may come on with the key off, so if the fans aren't running it's not overheating . An that reservoir is actually a surge tank ! Instead of replacing parts you don't need ,I suggest you take it to a ASE certified repair facility an have it fixed right the first time !
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