Question about 1999 Mercedes-Benz SLK

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Coolant light keeps coming on

I had the leaking reserve box replaced 2 days ago and the coolant light is back on. Could it be the water pump or air in the system?

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Mercedes benz 2005 v12 s600 how to bleed engine coolant system ,thanks in advance muhammad .

Posted on Mar 05, 2015

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You mean the "header tank" it could be that you had an air lock in the water jaket and its found its way out,,what you need to do it bleed the water jaket first then top up the rad,,from the header tank,,,the water in that will go down as you bleed the water jaket so keep it full up at all times

Posted on Jul 15, 2010

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It could be low on coolant,or air in the cooling system,or the coolant low sensor needs cleaning.

Posted on Jul 15, 2010

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Related Questions:


How to inspect,diagnose and repair minor over heating problem for under 2 hours.

Copyright © by Mustgo on Dec 2009

How to inspect,diagnosis and repair minor over heating problem in under 2 hours.

Thanks for viewing my Fixya tip post.

My goal is to solve the most common over-heat,running hot on stop and go traffic and intermittent cabin heating problem (no heat)

The target audience is DIY'er who has a car that's just starting to over-heating and has about 2 hours to ran though my check list.


The first part is basic universal safety.

Follow by steps the required to fully diagnose the root cause of the problem.

Example:air pocket in coolant system VS worn water pump VS blown head gasket.


Follow by THE FIX.


If you are just getting the initial sign of over-heating then you will be able to replace the thermostat2_bing.gif,gasket,black RTV,coolant mix and 50/50 mix coolant temperature sensor and get back on the road for under $80.

For those who has leaks on the radiator,water pump the repair cost will be much higher.

Losing coolant and having WHITE smoke coming out of the tailpipe after 15 minutes of warming up is a sign of blown head gasket.
This is an internal head gasket damage and the engine head(s) must be remove to do a head gasket job.


My tip is for folk what are encounter over-heating on the first week.
Hopefully under 3 times of over-heating.

Repeat over heat will warp the aluminum head(s),blow out radiator hose(s) and radiator.




MAKE SURE safety goggles are on at all time.


You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!


When the car is completely cool,check the electric fan(s) for smooth rotation.

Make sure there is not wobble movement or touching surrounding plastic.

Clean/check/change the thermo/temp sensor,contacts and wires.

CRC Electrical Contact Cleaner is the ideal chemical to speed up the cleaning job.

Clean the metal contacts on fan relay,inside the relay socket and fan socket.

Follow the sensor all the way to the firewall to make use it's in perfect condition.

Inspect other wiring for cut,and exposed wiring.

Use 3M high temp. electrical tape to protect damaged portion of the wire.



THIS IS A 30+ minutes JOB.

The longer you can monitor the coolant system will give you a better idea of the condition of the coolant system.

Excavate air pocket in coolant system / check for head gasket leak

Air pocket can be trap inside the coolant system.

The water pump's turbine / fins is totally ineffective when there is not coolant surrounding the water pump.

This test will kill two birds with one stone.

Most radiator shop charge $75 just to excavate / air purge the coolant system.


Top of the coolant reserve tank to the COLD / COOL / LOW level.

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Keep the coolant reserve tank cap in a safe location.

The goal is to lift the vehicle higher to monitor the air pockets and let it escape.

The radiator should be 8-20" high from the stationary position to let the air pocket to escape.

Let the car ran and start monitor the temperature.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up at 195-210 F,Electric fan should turn on automatically

If your vehicle has a secondary electrical fan then turn on the A/C and all lights,radio,and electrical items to ensure the fan is operation.

5-12 minute mark or after high idle you should see less bubbles.

If you DO NOT see any in rush of bubbles when thermostat opening between the 5-12 minutes mark then the maybe partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat housing few gentle taps.
(follow the TOP large radiator hose to the top portion of the engine)

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

A coolant pressure test is also a must to pressurize the coolant system to locate addition leaks.

Examples:radiator,head gasket,freeze plugs,or water pump

Let engine cold down,lower the car onto level server and top off coolant reserve tank to the TOP / FULL /HOT level.

Start monitor for coolant lost everyday.



If the radiator cap is over 5 years old or rusted badly then change it.
The spring can be weaken and will not hold pressure.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Thermostat,gasket and black RTV is not expensive and it should be change every 4 years or 48,000 miles.

A coolant flush is require every 2 years or 24,000 miles.
Check your service log for the last coolant flush.

Low heat condition is cause by combination of stuck thermostat,low coolant level,dirty coolant system and worn turbine / fins on the water pump.

If the water pump has over 85,000 miles on it then water pump can SLOWLY leak into the time belt cover.

The turbine/fins on the water pump can erode badly after 96,000 miles.

Monitor coolant level and check for water pump,radiator,coolant hose leaks.

Place a larger cardboard under the radiator,water pump or timing belt cover. Monitor the coolant drip and inspect the problem area accordingly

Visual Inspect your coolant reserve tank for bubbles when the temp. is near 195F+. (after a long drive) If you see hydrocarbon leaks then you should stop driving the vehicle until a shop do a pressure test and dye tests.


If my post is helpful to you then please rate it!

on Dec 05, 2009 | Honda Civic Cars & Trucks

1 Answer

Coolant nissan pulsar 1989

Quite often when replacing coolant in older vehicles new leaks start to show up. The newer technology in coolant makes it a really good cleaner, and when it I changed it would clean out any bit of rust scale exposing weak areas where new leaks can form. If the leak is coming from the front of the engine where the drive belts run, there's a good chance it is coming from the water pump.

Mar 04, 2014 | Cars & Trucks

1 Answer

Radiator boiling into recovery and boiing out

Does the vehicle overheat on the road? If it does and pushes big burps of coolant into the reserve tank then you could have a head gasket leak. Usually what happens with a head gasket leak is that the engine will often start and run normally but will soon start to push coolant out in a kind of foamy burp as the combustion gasses that accumulate in the engine block force their way out. You can have a small head gasket leak that allows combustion gasses to escape into the cooling system without getting coolant back into the engine and often the first symptoms of this kind of a leak is a motor that suddenly overheats, the heater quits blowing hot air and after a short while everything returns to normal for a day or so. As the leak worsens however it may keep pushing coolant out of the reserve tank with a cool or cold engine as the pressure builds to quickly for the reserve tank to handle it fully. Having said that if you have a perfectly good cooling system that is hot and take off the radiator cap it will spray blistering coolant coolant all over so never remove the cap from a warm or hot cooling system! Most additives won't stop a head gasket leak as there is just too much pressure for them to "stick" in the leak and they just get forced out of source of the leak. It's rare but you could have a water pump that's not circulating enough coolant around but usually you have different symptoms than this.

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Replaced water pump, alternator, radiator, crank sensor and no coolant leaks and car has antifreeze, but why is low coolant dashboard indicator light keep flashing on 97 saturn sl2

Inside the coolant reserve tank there is a sensor for coolant level.

Over time,this sensor can get stick.

Inspect the coolant reserve tank for crack or leak.

Locate the coolant level switch/sensor and soak it in clean warm water.

Make sure it's free to move up and down the float path.

Top off the coolant tank with coolant only.

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Jaguar X type Water Pump

if the pump is leaking then it needs replacing it sounds like someone in the past has introduced glycol based coolant in to a oat. organic acid tech coolant system THEY DO NOT MIX and go like brown jelly and block things up like heater/ac systems it needs a good flush using a cooling system flushing adative

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Coolant leak in my 2000 Ford Taurus

I don't have the same coolant system that Ford has listed, my is different for my 2000 Ford Taurus SE 6cyl 3.0L. Where can we find the right part. I want to the junk yard 3 years ago and find one but the problem with that one is the top keep popping off. I have replaced the top three times and I am pissed because I love my car but I keep having to spend money on this system. H.E.L.P!!

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