Question about 1989 Ford Probe
Radiator coolant levels are low as it is indication ...is the radiator fluid full even after running it a few minutes allowing it to circulate into the block itself you can check by removing the cap with engine running as long as it is cool before starting the vehicle and as it warms up it will flow be careful not to leave the cap off too long or it will shoot out the filler hole but a few minutes should tell weather it is full when exchanging fluid levels
Posted on Sep 13, 2009
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Posted on Jan 02, 2017
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There is a TSB for this problem. Here it is.
Bulletin No.: 04-06-02-007
Date: August 11, 2004
Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Operation/Check Sensor for Oil Contamination)
2000-2002 Buick Century, Regal
2000-2001 Chevrolet Lumina
2000-2002 Chevrolet Impala, Monte Carlo
2000-2002 Pontiac Grand Prix
2000-2002 Oldsmobile Intrigue
Some customers may comment that the low engine coolant level
indicator is always illuminated.
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.
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
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
^ 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.
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