Question about 1999 Pontiac Grand Am GT

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Low coolant lite.

Hi. I have a 1999 grand am 4.3 I replaced the coolant sensor and flushed old coolant out. I blead the coolant system. and still the coolant fans are not working.. They did. for only alittle bit after I put new sensor in. But now the temp. is up past 200 and the fans are still not kicking on. Do you think you know what it could be??

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I also own a 99 grand am 3.4L
The coolant fans will not come on until the engine temp gets to about 220 degrees.

if they do not come on the relays are located under the hood in the covered panel near the LF strut tower.

also the fans should run constantly when the A/C is turned on.

good luck

Posted on Jun 29, 2008


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My coolant isnt circulating,i have heat but low power and high car will overheat if I climb hills.

Hey Rayna,,, if you are sure the coolant is not circulating..??.. Then the water pump is no longer functioning.. OR....the coolant passages have partially clogged up.. When you replaced the thermostat , you should have reversed flushed the entire coolant system, check the radiator hoses for wear (they wear out from the inside), flushed the radiator completely..... Do the complete flush and check the hoses.. refill and see how much better it does..

Jul 11, 2017 | Pontiac Cars & Trucks

1 Answer

Low coolant level warning keeps coming up on information station not low on coolant. Where is sensor located or other related problems? Thanks.

You probably do not need a sensor. The coolant when it gets old in this car WILL cause the low coolant light to come on! Boy! I have been there on those vehicles soooo many times working for the dealer. The first one I encountered threw me for a few days before I FINALLY flushed out the cooling system and solved the problem. Somehow the coolant when it gets old it looses its conductivity and the sensor can not sense the coolant level is above its level. This vehicle does not use a FLOAT type sensor. It is a conductivity sensor. Flush the cooling system (unless you already have) and the problem SHOULD be gone. If not then you can change the sensor ok? The sensor is located on the passenger side of the radiator facing the engine about 1/4 the way down from the top. Be careful not to break the plastic retaining fingers that hold it to the radiator. Lube the o-ring that seals the new sensor before installation with some vaseline or silicone paste but try not to get too much into the cooling system itself.
Good Luck! Scott
Please rate my response/solution - Thank you!

Sep 04, 2011 | 1993 Oldsmobile Eighty Eight

1 Answer

I have boiling/gurgling noise in small front hose of my 2003 Passat. We just flushed system change water pump timing belt and thermostat.

Definately your engine need bleading.Because I don.t know the engine code I.ll give you an ordinary instruction for that.Open the bonnet and find were is the hoses of coolant system going to the heater radiator into dashboard.If they are above the coolant tank you need to open one of them/make sure there is no pressure into the engine coolant system by opening the coolant tank cap/.Than put pressure/air/in the tank to blead the system.if the hosses is low than the tank that means is selfbleading system.Than check for burnt head gasket/CO test for the coolant system.

Jun 21, 2011 | Volkswagen Passat Cars & Trucks

1 Answer

Getting hot

either needs a new thermostat, or has a hole in the cooling system causing the pressure to drop or coolant to leak out. is it low on coolant?this can also cause it to get hot or there may be a blockage in the coolant system try having the cooling system flushed and pressure tested.i hope this helps

Jan 03, 2011 | 1999 Jeep Grand Cherokee

2 Answers

My low coolant light flashes on and off then it will stay on.I have checked my coolant level it is good what could be the problem? 1999 Buick regal

Make sure you are checking the coolant level in the radiator as well as in the overflow tank. The sensor is located in the radiator, so if the level in the overflow tank is good, it could still be low in the radiator.

Dec 06, 2010 | 1999 Buick Regal

2 Answers

Electric radiator fan wont turn on . but when fan is jumped with 12 volts fan works

heres a little test start vehicle turn a/c on high in the defrost position your fan should start if so than test hi low fan relay and replace coolant temp sender not sensor in some cases replace both thank u have a good day.

May 04, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Heater on my 05 Grand Caravan blows cold air when below 30 degrees - above 30 works fine. Heat gauge shows normal so it shouldn't be thermostat. Checked coolant and it is fine.

just because the gauge seems normal doesnt mean the thermostat is good, its 5 years old,and may be opening to soon, i would start by having the t-stat replaced and while thats being done have the cooling system flushed including a flush off the heatercore. i ve worked on a couple of these vans with heating problems, most were low on coolant due to a slow waterpup leak, the others with half plugged heatercores, due to the lack of coolant flushes. hope this helps.

Feb 25, 2010 | 2005 Dodge Grand Caravan

2 Answers

Heat is luke warm at best on low. blows fine. had heater core flushed. still not sufficient temp.

One or more of:

1. Your coolant level is low
2. Your thermostat doesn't close and needs to be replaced
3. The valve from the cooling system to the heater core is stuck
4. Your heater core is clogged

Jan 08, 2010 | 1999 Jeep Grand Cherokee

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


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 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

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