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I have a 97 ford f150 with a steady antifreeze leak at the rear of the engine..it also seems to be at the front as well...the intake manifold has antifreeze standing there..

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You may have a frost plug leaking,common on those trucks.

Posted on Feb 02, 2010

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Jan 17, 2016 | Cars & Trucks

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97 f150 4.6l code 1506 high idle replaced gaskets & still has high idle. lower intake manifold leaking?


Check PCV System for vacuum leaks
Smoke Test all your work-intake,etc
Test & Smoke the Evap System for leaks

Mar 04, 2014 | 1997 Ford F150 Regular Cab

1 Answer

I will like to know if the antifreeze leak could be from the water pump if the leak comes from the bottom of the car and not from the radiator


ALL antifreeze leaks will be seen coming from the bottom of the car. Yes, it COULD becoming from the water pump. But then again, it could be coming from an intake manifold gasket, a heater hose, a throttle-body heater hose, a freeze plug, a timing cover, a heater control valve, etc..
To find out where it is leaking from, you must follow the antifreeze trail UP from where you see it leaking. Antifreeze leaks ALLWAYS travel downhill. Sometimes they can be deceiving also. I have seen intake manifold leaks at the front of the engine run all the way to the back of the engine and make it look like a rear freeze plug is leaking. Again, you must follow the trail to find the actual source.

Jan 03, 2012 | Cars & Trucks

2 Answers

Where are all the freeze plug located on 4.6 w/auto. is there one between the block & transmission


Yes, there are expansion plugs (freeze plugs) on both sides of the engine block and at the rear of the engine block between the engine and transmission. There are also a couple in the ends of the cylinder heads.

With all that said, I would like to add that many times with that engine, the heater tube and connecting hoses can leak and be mistaken for a rear expansion plug leaking. I would definately check this before pulling the transmission out.

There is a tube that runs from the back of the water pump under the intake manifold and out the rear of the engine where it hooks up to the heater hose/heater core. This tube has a small hose connecting it to the back of the water pump. There is also a hole in the back of the engine block that will allow antifreeze from under the intake manifold to leak into the transmission bell housing area. When this tube or hose leaks, it often gets mistaken for a leaking rear expansion plug.

It is very easy to check for this. Remove the serpentine belt and remove the alternator and look under the intake manifold down in the "valley" between the cylinder heads. If there is antifreeze in there, the hose or the tube is leaking. Look at the picture below. Item #3 is the tube and hose assembly I am talking about. Usually, just the hose is leaking. It should be replaced with a short piece of SILICONE heater hose. On some of the vehicles, there are 2 hose clamps. On others, the end of the hose that is attached to the tube has a crimped collar on it. If yours is like this, you can fix it by carefully cutting the crimp collar off and replacing the hose using band clamps. (screw-type)

Also look for antifreeze leaking into this area from the front intake manifold runner. They tend to leak on the front runner near where the thermostat housing is located. These will also leak into the valley area and run out the back of the engine. If the manifold is leaking, chances are it is warped. DORMAN makes a replacement intake manifold kit just for this purpose because it has been so common. It is also very easy to check for this with the alternator removed.
The DORMAN part number for your vehicle is 615-178 (See second picture below)


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1 Answer

Remove coolant thermostat housing 5.4 vin L


well if you are talking about the hose that lays inside the engine under the intake that goes from the front drivers side to the rear middle,then yes,i had to fix my own last year.

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1 Answer

My 2001 ford F150 is leaking water from above the trans


First off, is this water or antifreeze? If it's water it could be coming from the heat/air conditioning. If it's antifreeze, it's probably either a heater hose or the back of the intake manifold.

Dec 27, 2009 | 2001 Ford F150 Styleside SuperCrew

1 Answer

Coolent leaking from rear of engine cant see from where


ACCORDING WITH THE MODEL AND YEAR AND IF YOU HAVE A 4.6L ENGINE IS PRETTY COMMON LEAKS FROM THE INTAKE MANIFOLD TO THE CENTER OF THE ENGINE AND IS WHY YOU CANT SEE WHERE IS COMING FROM BECAUSE THE ANTIFREEZE RUNS TO THE BACK I RECOMEND TO CHECK THAT AND USUALLY YOU HAVE TO REPLACE GASKETS AND MANIFOLD BECAUSE THEY MELT DOWN ON THE UNION WITH THE LOWER INTAKE MANIFOLD(PROBABLY NEED TO REPLACE ONLY THE UPPER ONE)

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1 Answer

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It could all be related.P1537/38 are the intake manifold runner controls are stuck open.They are controlled by vacuum solenoids.The P0171 is bank one of the engine is running lean,usually caused by a vacuum leak, P0420 is catalytic converter efficiency code. The computer monitors the switch rate of the front 02 sensors and compares it to the switch rate of the rear 02 sensors to tell if catalytic converter is doing its job. Now if the front 02 is not switching properly then this will cause this test to fail and set this code.
Look on bottom section of the intake manifold at the back of engine(where tranny bolts up) you should see the vacuum motors there on the intake,these are the control motors for the intake manifold runners.Make sure the vacuum lines are hooked up and lines are not leaking. Also you will see a lever from it to intake make sure they move and are not binding.

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