Question about 1995 Mazda Millenia

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After installing new thermostat, there seems to be a leak under the intake It overheats and hisses smoke from the area under the intake. is there a hose under there i can replace

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It sounds to me like the cooling sysem either wasn't properly bled, or that you have a much bigger issue with a leak. If you have an external leak, you will see coolant leaking from somewhere. If it is an internal leak, you may have intake or head gasket problems. Either way, have a technician adress the problem before permanent damage occurs.

Posted on Jul 24, 2009


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Posted on Jan 02, 2017


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Engin overheats , but it doesn't leak so why have to keep filling up with water and seen steam comin from like underneath the thermostat

Check your exhaust pipe when running. Do you see a lot of white smoke? If so, you most likely have a blown head gasket and are losing the water into the cylinders. This will cause overheating with no apparent leaking. If there is no white smoke, then you could be losing water from the "weep hole" under the water pump. This water often hits the engine block and evaporates (causing steam). Once you turn off the engine, the leaking often stops. Look carefully at the underside of the water pump for a small hole where the pulley shaft enters the pump. If you see traces of coolant (or signs that coolant ran down from the hole), you need to replace your water pump.

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Sep 10, 2012 | 1999 Chevrolet Lumina

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I bought a 2000 lincoln ls about a month ago and after we bought it, it started having an over heating problem. Since then, we put new fan, new t-stat, new coils and valves, new radiator cap, new belts,...

I believe you have a head gasket or cylinder head problem (cracked head or blown head gasket).. If it is the gasket, the intake and cylinder head must be removed and a new gasket installed.. If it is the head itself, in addition to what have just said, you will have to have the head repaired or get a reconditoned or new one. This is a major repair.

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I have a 99 Chevy Tahoe, It recently started to overheat, to the point where I had to pull over and let it cool down. I changed out the thermostat, but It still overheats. Squeezing the tube from the top...

need to recheck the stat new doesnt mean free from fault but if loosing fluid is problem --the 99 is also known for a leak from the hot water connector that is located by intake manifold and valve cover passenger side it screws onto manifold and fails do to corrosion

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Grand Marquis LS 2004 smoking under hood on drivers side what is possibility of being gasket? no broken hoses ..not short on oil. no radiator or heater problems. ..brand new thermostat installed...

This model uses a composite (some would say plastic) intake manifold, which has been known to develop cracks in the area of the thermostat housing. In addition, the water pump has a pipe to the back of it that emerges in the rear of the intake manifold. Both of these areas peculiar to this motor are known to leak coolant. In its history, many of these plastic manifolds had to be replaced, and there were even techinical bulletins from Ford on them. If you have leak in the tube or pipe that goes under the intake manifold to the back of the water pump, then you will likely want the dealer to fix it, as you may need a new water pump.
Two things then to watch: 1) coolant level and color and 2) any signs of leakage behind the main serpentine belt in the area of the water pump.
Since the serpentine belt is large on the 4.6L motor, and due to its rotation, it is possible that you only have a bad water pump and that the liquid is being thrown by the rotation of the motor. The water pump is not a difficult repair, as it comes off with only a few cap screws. However, if it is detached from the rear inlet pipe (as I mentioned above), it would require that the manifold be removed for it to be reattached. This is not a difficult job, but is very time consuming.

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no, the lower intake is leaking(common fault with 4.3)will have to get lower intake gasket changed,there is an up dated gasket for ths from FEL PRO

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1 Answer

Engine light is on

You probably have a vacuum/air intake leak.
With the engine idling, spray very short bursts of starting fluid/ether around the intake and surrounding engine bay and wait a second. If the engine surges, there is an intake leak which you can identify by closing in with the ether.
Put car outside,
do this in a ventilated area,
dont smoke
have a blanket handy in case of a backfire fire.
DONT spray ether idirectly into the air intake when the engine is running

A bad intake leak is audible by a hissing sound. A bad rubber hose is often the cause.
Any vacuum hose under the hood can cause this.
The PCV valve which can also cause this code when faulty, should be replaced as a matter of course. its in the valve cover and only costs a coupla bucks. They are easy to fit.
Hope that helps
pls be conservative with the ether its not good for your engine in large doses!!

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