Question about 2000 Chevrolet Impala

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Coolant leaking, engine starts to get hot

Had someone look at it, he told me the leak was at the intake, tried to fix it but coolant was still leaking out. He said there were really so many problems i should get a new engine ($1200 is cost prohibitive at this time); he suggested using Blue Devil to see if that would stop the leaking. I haven't picked up the car yet but he said it didn't stop the leaking and the bloc might be cracked. Can you list any solutions, starting with the least expensive?

Thank you.

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  • jackatay Dec 16, 2008

    Thanks gforce3s. When I picked up the car I asked about the intake manifold, the guy said he replaced it (don't know if it was GM's updated version though; didn't remember to ask that), but he said there still a leak - thinks the block is cracked & until I can figure out whatelse to do - pay for extensive repairs or pay for new engine (need to get $ together) - I have to drive the car as is; I just have to keep an eye on the temp guage.

    Thanks again!



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It is EXTREMELY common for the intakes of these cars to leak coolant, internally and externally. What i would reccomend to do is to replace the intake manifold with gm's updated version, which fixes the coolant leaking issue. also change the oil, as some of the coolant most likely found its way internally down to the crankcase. this is really the only way to repair this issue, and it is very common.

Posted on Dec 15, 2008

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

How To Find & Fix Coolant Leaks


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:
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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.

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