Just replaced head castikts plugs &wires brand new manifold check eng. Light went off but my low coolant light won't go off I've flushed the radiator but shill won't go off still running a bit hot witch it never have before ...simes like it was running cooler when the check eng light was on then it is now .....after placing all thow parts

Pontiac Grand


for the easy solution download the pdf file

Fuel injector or wire to it. Check the wire with a test light or noid as the car is running. The light should flash. Wires good. Use an ohm meter and check the lead in the injector. Should be 11 to 15 ohms. After that is a compression test on that cylinder. No compression is a blown head gasket. If all that checks good, Then I would be looking at the intake manifold gasket. They can blow and pump coolant in a cylinder. Year make and model helps. Some models have know problems.

Have your thermostat on the engine checked, if it is not opening like it should and is stuck it can cause these things to happen.

P0113 Intake Air Temperature Circuit High Input

Low temperature results in a high signal voltage. When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code.

P0118 - The engine coolant temperature (ECT) sensor is a thermistor screwed into a coolant passage in the cylinder head. Sensor resistance is high when coolant temperature is low and resistance drops when coolant temperature increases. The powertrain control module (PCM) provides a 5 volt reference and a ground to the sensor. The PCM monitors voltage drop to determine coolant temperature. If the ECT reads less than freezing temp. when engine has been running for more than a few minutes, the PCM determines a circuit fault and sets this code. Or if the PCM determines the sensor resistance is out of specs, this code is set.
Potential Symptoms

Symptoms of a P0118 could include:

• Very poor fuel economy
• A no start condition
• Vehicle may start, but run very poorly, blowing black smoke, running very rough and misfiring
• Illumination of MIL

Causes

A code P0118 may mean that one or more of the following has happened:

• A bad connection at the sensor
• An open in the ground circuit between the ECT sensor and the PCM
• A short in the voltage feed between the sensor and the PCM
• A bad PCM (less likely)
• A bad temperature sensor (shorted internally)

Hi the problem you are having is with the low level sensor this is located in the coolant filler cap and all you need to do is get this replaced, they are not expensive to buy and it will solve your problem.

first check the wires are not loose or shorting give them a good wiggle and see if the warning light goes off also get someone to press the switch by hand and see if that turns the light off or not.

let me know if you need further assistance ok

plz rate this solution as i have a whole page of unrated posts, thanks

You got a bad ground connection somewhere.
You have a voltage drop,where you shouldn't have,and as a result the bulb is dim.
Check the bulb socket/connector and related wiring, to that head light

coolant senor

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.

Check your oil----is it very high? Put a piece of cardboard under your car overnight, see if you have any leaks externally. If not, then you have an internal leak, which indicates a blown head gasket.

1 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. 2 Inspect Hose (Bypass) Ruptured, cracked or leaking bypass hose. 3 Inspect Hose (Heater) Ruptured, cracked or leaking heater hose. 4 Inspect Radiator Cap Worn or damaged radiator cap 5 Inspect Heater Core Heater core may be leaking antifreeze/coolant into the vehicle`s floor area. 6 Inspect Heater Control Valve Leaking or defective heater control valve. 7 Inspect Radiator Drain Plug Loose, damaged, or faulty radiator drain plug. 8 Inspect Radiator Rusted, corroded, or damaged radiator may be leaking antifreeze/coolant 9 Inspect Water Pump Damaged, worn or leaking water pump. 10 Inspect Cooling System Mix Coolant level low or flow is restricted. 11 Inspect Head Gasket - Performance Blown head gasket 12 Inspect Hood Brace Leaking, worn, or damaged intake manifold gasket 13 Inspect Freeze Plug Freeze plugs are cracked or leaking.