Question about Chevrolet Malibu

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1999 malibu coolant system is overflowing thru the overflow hose. not overfilled. do you need to purge the system? How? Therostat?

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It would seem that the cap needs replacing as it is not able to hold pressure, allowing coolant past when the engine is hot.

Posted on Oct 16, 2010

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There is a hose coming from the overflow. It isn't attached to anything. The overflow leaks. Is this hose to reduce pressure or is it supposed to be attached, and if so, where?


it's not attache to anything,it's the overflow exhaust meaning for too much coolant or overheating. there is a mark on the tank to adjust coolant level. don't pour too much,

Aug 13, 2013 | 1999 Chevrolet Malibu

1 Answer

My 1999 Chevy Malibu is losing the coolant though the overflow hose by the resevior I've had my head gaskets replaced there is no overheating no water oil mix, but my radiator fans arent working I


Sounds like you need to disconnect the Radiators' electric fans and have them tested. You absolutely must have them working, or your car will overheat. Check to see if the Temperature guage is working.

You need to go to a good autoparts store and have them test the fans and charge and test your battery. You may need some sensors to activate the Radiator fans, but you could be running the battery down with shorted cooling fans.

There are also Relays which work with the Radiator fans. The overflow will stabilize once the water gets into where it belongs. Make sure your Thermostat is not clogged with the sealer.

Jan 15, 2012 | 1998 Chevrolet Malibu

1 Answer

No my alero is overheating. I have replaced the thermostat and waterpump and put a new cap on reservior and im losing coolant out the overflow


YOU NEED BLEED AIR OUT THE COOLING SYSTEM.WAIT TO ENGINE COOL DOWN.YOUR VECHICLE YOU HAVE TO POUR COOLANT IN THE COOLANT OVERFLOW JUG UNTIL COOLANT LEVEL STAY AT THE FULL COLD MARK.THEN START ENGINE LET IT IDLE A FEW MINUTES WATCH COOLANT IN THE OVERFLOW JUG WHEN IT DROPS ADD MORE COOLANT UNTIL COOLANT LEVEL STAY AT FULL COLD MARK.WHEN COOLANT LEVEL STOP DROPPING IN OVERFLOW JUG.SCREW RADIATOR CAP BACK ON OVERFLOW JUG WATCH ENGINE COOLANT TEMPERATURE GAUGE AS COOLANT TEMPERATURE START CLIMBING TURN OFF ENGINE LET IT SET A WHILE KEEP FROM GETTING SCALDED.TAKE LARGE RAG PLACE OVER COOLANT OVERFLOW JUG CAP SLOWLY OPEN RADIATOR CAP A LITTLE AT A TIME UNTIL PRESSURE RELEASE.REMOVE OVER FLOW JUG CAP.ADD MORE COOLANT UNTIL COOLANT LEVEL AT THE FUL COLD MARK ON THE OVERFLOW JUG.THEN SCREW CAP BACK ON THE OVERFLOW JUG.START ENGINE LET IT IDLE AGAIN WATCH ENGINE COOLANT TEMPERATURE GAUGE WHEN TEMPERATURE GAUGE START CLIMBING.TURN OFF ENGINE WAIT A WHILE.CHECK COOLANT LEVEL IN THE OVER FLOW JUG.DO THIS PROCEDURE UNTIL THE COOLANT LEVEL IN THE COOLANT OVERFLOW JUG STOP DROPPING AND STAY AT FULL COLD MARK,WHEN THE TOP RADIATOR HOSE GET HOT THERMOSTAT OPENING AIR IS OUT THE COOLANT SYSTEM. WHEN ENGINE COOLS DOWN.CHECK COOLANT OVERFLOW JUG COOLANT MUST BE IN THE COOLANT OVER FLOW JUG AT THE FULL COLD MARK WHEN ENGINE COLD. DONT .DONT OVERFILL COOLANT OVERFLOW JUG.KEEP COOLANT IN THE OVERFLOW JUG IF YOU LET COOLANT OVERFLOW JUG RUN DRY AIR WILL BE DRAW IN COOLANT SYSTEM CAUSE ENGINE TO OVERHEAT.

Aug 12, 2011 | 1999 Oldsmobile Alero

1 Answer

My coolant resevoir is full but top coolant hose is empty. Is there a bleeder system?


Here is a basic description of cooling system, the top hose going to engine is the supply hose the bottom hose is the return hose. On your overflow coolant reservoir there is a lower cold level mark and a hot level mark above it also there is an overflow drain spout several inches above hot level mark to relieve pressure if system is overfilled. As to a bleeder system, bleeders purge air from a system to allowed it to become primed (pressure built up) generally on hydraulic systems like brakes or pneumatic systems like a diaphram pump for example. the only drain available is the petcock valve at the bottom of the radiator used to drain coolant. Now to your top hose being empty, you can remove top hose to engine have a garden hose running into radiator and if radiator cores are not stopped up water should flow freely from hose if not radiator is clogged. If you have water flow now you can pressure test system it should hold between 15-18lbs pressure constantly otherwise check all hoses/clamps etc (if leaks were present before replace faulty component/s) your vehicles water pump circulates coolant and is what pressurizes cooling system. A faulty thermostat will also restrict coolant from entering the engines coolant passageways if it doesn't open and your vehicle would overheat soon after, but you should still have coolant in upper hose when engine is running regardless. If you can add other info like your vehicle is running hot or coolant light coming on I can narrow it down for you.

Jan 07, 2011 | 1996 Pontiac Sunfire

2 Answers

99 Chrysler 300M. As there is no visible radiator cap, when I drain the cooling system does it refill through the reservoir?


The reservoir is the traditional top tank of your radiator.

The answer to your question is yes.

May 31, 2010 | 1999 Chrysler 300M

1 Answer

Radiator fluid leaking from hose under overflow container on 2001


That should be the hose and pipes that feed or return coolant from the heater core thru the firewall.

Apr 24, 2010 | 2001 Chevrolet Malibu

1 Answer

97 cadillac eldorado overflowing through overflow pipe


The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank(not the cap),this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.

Apr 11, 2010 | 1987 Cadillac Eldorado

2 Answers

Vehicle overheatd...where do you put in more water?


You really shouldn't just add water. You should add a mixture of coolant and water.

You will need to wait until the engine is cold. This will allow the system to depressurize. NEVER open a hot radiator. Squeeze the upper radiator hose to be sure there is no pressure. It should be soft enough to easily pinch the opposite walls of the hose together.

Remove the radiator cap (see image). Use a funnel to avoid spilling. Coolant is poisonous. Fill the radiator to the top. Replace the cap.

Check the overflow bottle (see image). The coolant should be right up to the line that says 'Full Cold'. Remove the cap and fill accordingly. Do not overfill this bottle. Doing so will cause coolant to be expelled at normal operating temperature. Just go right up to the cold line.

Start the engine and check for obvious leaks. Drive the truck for about 3 or 4 minutes. This will purge air pockets and bubbles from the system. Turn it off and allow to cool. Open the radiator cap and top off as necessary. Double check the overflow.

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Mar 02, 2010 | 1999 Chevrolet Blazer

2 Answers

Car keeps running hot and/or coolant overflowing from overflow hose


or you need 2 replace the hose fitting that directly connects the hoses 2 the motor. the end connected 2 the side of the engine can be worn,

Nov 04, 2009 | 1999 Chevrolet Malibu

2 Answers

1999 malibu


head gasket leak will cause it to over heat,gas gage not working check sennig unit in the gas tank.

Sep 02, 2008 | 1999 Chevrolet Malibu

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