Question about 1998 Lincoln Navigator

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Leaking coolant from above transmission while started or killed

It looks like it is coming from under intake the vally between the heads is filling with coolant

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  • Lincoln Master
  • 3,103 Answers

Look for heater hose connections first and check these..some models use coolant to warm up/ cool the tbi unit by way of a hose to the base of it or gaskets and passages made into the design of that particular model, if so equipted these gaskets need replacing..some models use a crossover tube between heads in the rear(older buicks had them on v-6 and v8 engines)and they do fail on occaision by rustout or gasket failure..check these and repost the findings please..thnx

Posted on Jan 17, 2013

  • chris stapp Jan 17, 2013

    checked all hoses did not find leak i replaced radiator 3 months ago then the lines that go to the heater in the back seat split all throughout the lines running to the back so i blocked them off to stop the leakbecause the lines are shot i was going to remove parts until i found the leak but the source remains unfound

  • chris stapp Jan 17, 2013

    i thought maybe the intake or something under it was leaking

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Posted on Jan 02, 2017

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I have a 2001 2.2L gt pontiac sunfire.im wondering what could cuase coolant to leak from the bottom of the intake manifold. That's where it semms like its leaking from because its coming from above the...


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Not very likely, check the coolant passage between the cylinder heads. (The front part of the intake, right behind the alternator) That piece which is part of the intake manifold has been a source of coolant leaks for many vehicles like yours. The alternator is pretty easy to remove... Disconnect the negative battery cable, turn the belt tensoner to remove the belt from the alternator, take out the two long 10mm bolts under the alternator and the three on top. I would check for leaks there because it was a common problem area, coolant would leak behind the alternator, fill the space under the intake manifold, and leak down right where the transmission bell housing is. There are expansion plugs, and allen plugs on the back of the cylinder heads, but they rarely leak.

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If you have antifreeze leaking from what appears to be coming from the transmission bell housing, the leak is most likely (although possible) not at the rear of the engine.

There COULD be a freeze plug at the back side of the engine between the engine and transmission leaking. However, on the 4.6L engines, it is most commonly caused by either a water pump, heater hose, or intake manifold leaking at the FRONT of the engine.

Leaks in these areas will fill the area between the cylinder heads with coolant, which will run to the back of the engine and out the hole in the cylinder block that is located just above the transmission bell housing. This makes it LOOK like the leak is in the rear.

To verify this condition use a flashlight to look under the intake manifold just past the alternator. Sometimes it is also very helpful to remove the serpentine belt and remove the alternator (very easy to do) to verify that this is the problem.

Take a hard look at the coolant cross-over pipe on the front of the intake manifold assembly. These are notorious for leaking on both sides and VERY LIKELY to be leaking on the driver's side where the thermostat is located.

This problem is so common that an aftermarket company named DORMAN has come up with an aftermarket replacement intake manifold to correct the problem. The DORMAN part number for your vehicle is Part Number: 615-175 It is available at many aftermarket parts suppliers including AutoZone, O'Reilly's, and Advance, for around $230 (USD). (See picture below)


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I just changed the thermostat on 3.4 L 1999 Pontiac Gr Am GT THINKING IT WOULD FIX THE OVER HEATING. But there is white steam coming out the exhaust! The oil is not milky so it's not a head gasket. There's...


Are you adding coolant?
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Fill the coolant tank to the top...right to the top....leave the cap off and run the engine.
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keep me posted thx.......

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