Question about 1995 Chevrolet Lumina

1 Answer

Have a 95 Limina car with 280 000KMs. I changed both head and intake gaskets a few months ago. I`ve also changed the heater core (leaking). Both times the system was flushed and filled. Replaced the thermostat first with a Prestone one then an OEM one (thought my problem was the Prestone thermostat). I just can`t seem to get enough heat out of the car. There`s some, but as soon as you start driving it gets cooler. The gauge sits at about 1/4 unless you`re idling for a long time. Then it moves to half. Fans work properly. I know it`s winter. Temps here in Canada are -10 to -20 celsius. My Impala is wonderful for heat. More than enough! Checked for air in the lines. Can`t seem to figure this out. Any ideas?? Ian

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 12 Answers

Yes I can help! it seem that you have some air in your cooling system. first you will have to drain the system by removing the lower radiator hose. clamp the radiator hose in place refail the system with 70% cooleant and 20% water. remove the radiator cap and start the engine allow air bubble to escape from the system while the engine is on but do not allow the coolean to over flow from the radiator. replace the radiator cap as soon as you see steam coming from the cooleant. another way is-- you can keep the radiator cap on and loose the bleeder valve that is located on the thermostat side and the other at the back of the engine near the fire wall or crow. Also check the thermostat. make sure it is in the right position and the little opening on the thermostat is not clog and the spring is pointing toward the engine. also make sure that thermostat is right one for your car.

Posted on Dec 31, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Antifreeze leak from rear of engine on pontiac grand prix


Rule out leak from water pump. What engine is it - 3.0 3.8. Could be intake manifold gasket. Have the cooling system pressurized, about 12 lbs. and look for leak, bubbles.
check oil for coolant in oil also. Possible head gasket leak.

Mar 21, 2014 | 2003 Pontiac Grand Prix

1 Answer

Few days ago cavalier decided to empty coolant out of its tank and overheat. we since then took compressor off serpentine belt changed thermostat checked oil for water flushed system checked fan heater...


Water pump. The impeller can come loose from the shaft and not circulate enough coolant. These can throw you off, because when you remove the pump the impeller will be tight against the shaft. It is when they warm up they begin to slip. If the heater core is not leaking don't bypass it.

Aug 17, 2011 | 1997 Chevrolet Cavalier

1 Answer

1994 Pontiac Sunbird was driven for three months without coolant until it overheated a day ago. It overheated on the way home and started smoking out of the air vents. That night, I filled it with...


i assume the shop was talking about heater core being bad and even if heater core is bad they should be able to test for a head gasket being bad actually you can totally bypass the heater core so there no reason to fix that before you check for a head gasket being bad
and if you have run for three months without coolant you will be extremely lucky if the head gasket not blown or head or block cracked
i would do nothing about the heater until car is checked for blown head gasket
honestly i would take the car some where else because they are either trying to screw u or have no idea of what there doing

Feb 25, 2011 | 1994 Pontiac Sunbird

4 Answers

Loosing coolant no visible leaks about 1/2 gallon every 100 miles


How To Find & Fix Coolant Leaks

861e67b.gif

WHERE COOLANT LEAKS OCCUR
Coolant leaks can occur anywhere in the cooling system. Nine out of ten times, coolant leaks are easy to find because the coolant can be seen dripping, spraying, seeping or bubbling from the leaky component. Open the hood and visually inspect the engine and cooling system for any sign of liquid leaking from the engine, radiator or hoses. The color of the coolant may be green, orange or yellow depending on the type of antifreeze in the system. The most common places where coolant may be leaking are:
Water pump -- A bad shaft seal will allow coolant to dribble out of the vent hole just under the water pump pulley shaft. If the water pump is a two-piece unit with a backing plate, the gasket between the housing and back cover may be leaking. The gasket or o-ring that seals the pump to the engine front cover on cover-mounted water pumps can also leak coolant. Look for stains, discoloration or liquid coolant on the outside of the water pump or engine.

Radiator -- Radiators can develop leaks around upper or loser hose connections as a result of vibration. The seams where the core is mated to the end tanks is another place where leaks frequently develop, especially on aluminum radiators with plastic end tanks. On copper/brass radiators, leaks typically occur where the cooling tubes in the core are connected or soldered to the core headers. The core itself is also vulnerable to stone damage. Internal corrosion caused by old coolant that has never been changed can also eat through the metal in the radiator, causing it to leak.

Most cooling systems today are designed to operate at 8 to 14 psi. If the radiator can't hold pressure, your engine will overheat and lose coolant.

Hoses -- Cracks, pinholes or splits in a radiator hose or heater hose will leak coolant. A hose leak will usually send a stream of hot coolant spraying out of the hose. A corroded hose connection or a loose or damaged hose clamp may also allow coolant to leak from the end of a hose. Sometimes the leak may only occur once the hose gets hot and the pinhole or crack opens up.

Freeze plugs -- These are the casting plugs or expansion plugs in the sides of the engine block and/or cylinder head. The flat steel plugs corroded from the inside out, and may develop leaks that are hard to see because of the plug's location behind the exhaust manifold, engine mount or other engine accessories. On V6 and V8 blocks, the plugs are most easily inspected from underneath the vehicle.

Heater Core -- The heater core is located inside the heating ventilation and air conditioning (HVAC) unit under the dash. It is out of sight so you cannot see a leak directly. But if the heater core is leaking (or a hose connection to the heater core is leaking), coolant will be seeping out of the bottom of the HVAC unit and dripping on the floor inside the passenger compartment. Look for stains or wet spots on the bottom of the plastic HVAC case, or on the passenger side floor.

Intake Manifold gasket -- The gasket that seals the intake manifold to the cylinder heads may leak and allow coolant to enter the intake port, crankcase or dribble down the outside of the engine. Some engines such as General Motors 3.1L and 3.4L V6 engines as well as 4.3L, 5.0L and 5.7L V8s are notorious for leaky intake manifold gaskets. The intake manifold gaskets on these engines are plastic and often fail at 50,000 to 80,000 miles. Other troublesome applications include the intake manifold gaskets on Buick 3800 V6 and Ford 4.0L V6 engines.

INTERNAL COOLANT LEAKS
There are the worst kind of coolant leaks for two reasons. One is that they are impossible to see because they are hidden inside the engine. The other is that internal coolant leaks can be very expensive to repair.

Bad head gasket --Internal coolant leaks are most often due to a bad head gasket. The head gasket may leak coolant into a cylinder, or into the crankcase. Coolant leaks into the crankcase dilute the oil and can damage the bearings in your engine. A head gasket leaking coolant into a cylinder can foul the spark plug, and create a lot of white smoke in the exhaust. Adding sealer to the cooling system may plug the leak if it is not too bad, but eventually the head gasket will have to be replaced.

If you suspect a head gasket leak, have the cooling system pressure tested. If it fails to hold pressure, there is an internal leak. A "block tester" can also be used to diagnose a leaky head gasket. This device draws air from the cooling system into a chamber that contains a special blue colored leak detection liquid. Combustion gases will react with the liquid and cause it to change color from blue to green if the head gasket is leaking.

Head gasket failures are often the result of engine overheating (which may have occurred because of a coolant leak elsewhere in the cooling system, a bad thermostat, or an electric cooling fan not working). When the engine overheats, thermal expansion can crush and damage portions of the head gasket. This damaged areas may then start to leak combustion pressure and/or coolant.

Cracked Head or Block -- Internal coolant leaks can also occur if the cylinder head or engine block has a crack in a cooling jacket. A combustion chamber leak in the cylinder head or block will leak coolant into the cylinder. This dilutes the oil on the cylinder walls and can damage the piston and rings. If the coolant contains silicates (conventional green antifreeze), it can also foul the oxygen sensor and catalytic converter. If enough coolant leaks into the cylinder (as when the engine is sitting overnight), it may even hydro-lock the engine and prevent it from cranking when you try to start it. Internal leaks such as these can be diagnosed by pressure testing the cooling system or using a block checker.

A coolant leak into the crankcase is also bad news because it can damage the bearings. Coolant leaking into the crankcase will make the oil level on the dipstick appear to be higher than normal. The oil may also appear frothy, muddy or discolored because of the coolant contamination.

Leaky ATF oil cooler -- Internal coolant leakage can also occur in the automatic transmission fluid oil cooler inside the radiator. On most vehicles with automatic transmissions, ATF is routed through an oil cooler inside the radiator. If the tubing leaks, coolant can enter the transmission lines, contaminate the fluid and ruin the transmission. Red or brown drops of oil in the coolant would be a symptom of such a leak. Because the oil cooler is inside the radiator, the radiator must be replaced to eliminate the problem. The transmission fluid should also be changed.

continue...

Mar 12, 2010 | 1998 Oldsmobile 88

1 Answer

I just got all the fluids topped off a month ago. The car started to smell when I turned the heater on 2 weeks ago, and then began to overheat for the first time. When I checked the radiator, it was bone...


fill the radiator and start the car let it sit at idle for a while. then check under the car for leaks. try to locate the leak and see if its a job you can handle or take it to a shop also you said you smellled it when you turned on the heat. check the passenger side floor board and see if it's wety this could be a bad heater core. if you cant find the leak check your tail pipe smoke if it's real smokey and white this is a sighn of a bad head gasket or intake gasket

Jan 05, 2010 | 2005 Suzuki Forenza

1 Answer

I have been having problems with my car leaking and overheating for some months now. I first replaced my thermostat, which worked for awhile. Then once the problem resumed, I changed my upper radiator...


I AM LOOKING AT THE RADIATOR CORE LEAKING OR ITS PLASTIC SIDE TANKS.CHECK WATER PUMP WEEP HOLE IT WILL LEAK OUT COOLANT WHEN PUMP GOES BAD IT WILL CAUSE OVERHEATING.CHECK THE CYLINDER BLOCK CORE PLUGS SOMETIMES THEY WILL GO BAD AND LEAK OUT COOLANT.

Sep 28, 2009 | 1999 Oldsmobile Alero

2 Answers

Antifreeze leaking out of right side of engine but only when heater is turned on. doesnt leak otherwise, what could this be


Have a look for a heater control valve that may be leaking in area near firewall on passenger side, just follow your heater hoses.

Feb 20, 2009 | 1990 Toyota 4Runner

1 Answer

Coolant issue with 1997 blazer


check to see if you have a leak in your heater core,and if the heater core is not leaking you might have a leak on the intake gasket or the head gasket

Jan 03, 2009 | 1997 Chevrolet Blazer

1 Answer

95 Lumina car, 3.1 , poor heat


Did you check the temperature switch to make sure it was actually turning all the way to high or hot and not staying on cold or medium heat? May need a new control inside car dash.

Dec 31, 2008 | 1995 Chevrolet Lumina

Not finding what you are looking for?
1995 Chevrolet Lumina Logo

161 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

60667 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21936 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...