Ford F-150 - 1997-2003 :: Coolant Leak At Rear Of Engine On Passenger Side Below AC Housing
Aug 19, 2015
I have a 1990 F-150 w/351 that I knew had a coolant leak at the back of the engine when I bought. It's a tinker around truck, something for me to play with.
I've traced the leak back to a metal tube/pipe that sticks out of the engine compartment just below the AC housing. I cannot find anything in the Haynes manual or a diagram on the intertron that shows what this is and if it should have a hose on it or...?
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I'm trying to figure where the coolant leak is. Appears to originate on the driver's side front, right near the thermostat housing. Since the engine tilts back the entire drivers side is wet. The thermostat gasket appears to be OK, but it does have a lot of miles on it.
If it's not the thermostat then can coolant leak from the cross over tube. And is the cross over removable without taking off the intake. There appears to be a bolt coming up from underneath on the passenger side.
Also, does coolant flow through this plastic intake. If it does, then the leak could be some where else, if not, then it's probably the thermostat.
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I have a 2001 Screw 4x4 that had a bad valve on the passenger side. I got the head rebuilt and put it all back together. Now it has a pretty bad oil leak at the rear of the engine. I thought it was the valve cover gasket but when I took it off the gasket was right where it's supposed to be. I pulled the starter and it seems to be leaking out of the new head gasket. What could I have done wrong? The thing runs perfect now but it's dripping oil like crazy so I had to have done something wrong. I used an OEM head gasket from the dealer and torqued the new head bolts to 30 ft-lbs and then went another 90 turn twice just like the book said.
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Only when running heat or defrost, coolant leak looks like it's coming out of the bell housing. I have a supercharger so very difficult to see behind motor, but with inspection camera, heater hose lines look dry. firewall looks dry. No coolant in cab. No steam on windows or smell. Pretty sure not casting/ freeze plugs because absolutely no leaking with heat off. Can run for days with no loss, then turn on heat and within minutes/ seconds coolant puddling in driveway. Is the hose that runs through valley pressurized only when heat is on? I saw a few older threads but as far as I could tell none specified heat on/ heat off conditions. Just started problem after doing some other work, hoses were off radiator and intercooler, replaced radiator. None of those connections are the culprit.
98 F150 Lariat 1900 TVS S/C Chiller Killer I/C 19PSI Snow performance WMI
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My 2003 GTI 24V VR6 is leaking coolant pretty quickly from the passenger side of the engine compartment. I have a new water pump in hand. If I'm replacing the water pump, would it be smart to go ahead and order a thermostat and metal crack-pipe to replace at the same time that I'm having the water pump installed? I'd hate to get the water pump installed, and find out that the leak is at the crack pipe.
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I have a 96 explorer that has recently developed a coolant leak. i was able to find the location of the leak, but i am puzzled by what is causing it. It is leaking on the back, passenger side of the engine, and while the truck is running it just squirts coolant out on and off...i am guessing it leaks when the thermostat opens. anyways, what is could be? i was thinking lower intake gasket, but i have never seen a lower gasket squirt like that!
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I have a 2001 expedition 5.4 ltr that has developed a coolant leak. Leak appears to be on top of the engine, in front on passenger side. The area around the front fuel injector (on passenger side) is wet and water is running down and sitting on top of engine (under intake manifold). My first thought was that the heater hose extending vertically from the block hose fitting. I have found no evidence of a leak in the hose but it appears fitting on block may be the source. It has three bolts holding it onto the block. One from the top and two coming up from the bottom. Two of the three area accessible. How to get to the upside down bolt nestled between hose fitting, block and valve cover. It's been a slow leak so far but I know that's not going to last. Runs fine but steams from water on block at stops and when parked.
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2003 7.3 175,000 miles...
Saw a stain in my driveway where you normally see AC drip. Opened hood and saw degas empty.
Looking around like crazy and find wet area. Where the coolant line turns down beside the passenger fender.
Looks wet near bend going toward running board. Didn't get to inspect much but I pulled back a bit of loom to inspect shape of lines and they look great.
What could be going on?
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I have a leak on the right side of the cross over pipe. I removed one long bolt from the right side and two long bolts from the left side that go through the thermostat housing, and three bolts from the back of the alternator, but the pipe doesn't seem to want to move. I don't want to break anything.
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I have a coolant leak somewhere on the top of the engine running down to the oil pan and bell housing. I have done some research and discovered it could be the coolant inlet tube to the turbo.
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I have a small coolant leak coming from the passenger side near the back of the engine that forms a spot about the size of a dinner plate if it sits for a few days.
One thing I noticed is if I turn off the AC selector switch when I park I will get the drip but if I leave the switch on MAX AC when I shut the truck off I do not get any leaking.
It is definitely coolant and not just the condensation from use of the AC. If I haven't used the truck for a few days or if I have run it with the AC off I will get the drips.
If I run with the AC on and leave the switch in the on position when I shut the truck off it won't leak. I have tried to locate it from looking above and below but can't determine where it is coming from.
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I did a search but found nothing on a coolant leak. My 07 (57K) has developed a leak on the passengers side of the engine. Not sure if its the water pump (not making noise) or the themostat housing as a mechanic who took a very quick look at it suggested. How hard it is to get to the thermostat housing? Anything else have to come off? I don't have a FSM.
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2003 F250 7.3... I noticed a water leak dripping down onto passenger side front leaf spring. I saw this before but attributed it to the AC (which kicks butt) but haven't used the AC. No scent to the clear fluid, temps all look good. Running fine. Where does the AC discharge go? Could AC be on (not on AC but set in blue zone on dial)? Reservoir looks ok but could e small volume of drips.
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2002 F150 FX4 w/ 5.4 Just sprung a new oil leak somewhere and I can't tell where it's coming from. The oil is actually dripping off the frame on the passenger side. It looks like the leak is somewhere at the back of the engine on the passenger side above the bell housing. It's dripping on the frame and running down a little ways before dripping to the ground. I can't get a good visual without removing the inner fenders. It's a pretty good leak that just started yesterday. Not a drop before then. I just had the oil changed within the last couple of days if that works.
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I have a possible oil leak as the title said and it's a 5.4 triton. I believe I'm seeing oil under the frame on the passenger side. Where the leak is coming from and I know it's not a severe leak it's still concerning and what it could be. 2000 F150 Lariat 5.4 ....
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Two weeks ago I was driving home from work and my heat stopped working. I pulled over and saw coolant dripping badly out of the bottom of my truck. I popped the hood and sure enough, coolant was bubbling out of the front passenger side of the intake. I took it to a shop to do the work (quoted at 500-550 out the door with a dorman intake). A week goes by and I get a call from the shop, "After two Dorman Intakes, the truck is not running right", what it could be.
The truck has 367k on it (not sure if original motor). Yesterday I get a call from the owner, " we put the original intake back on and fixed the leak with jb weld. The truck still runs bad. They claim they didnt do anything wrong and will not take any blame for ruining my engine. (Keep in mind the truck ran PERFECT when I took it in there). The truck doesnt throw any codes and they are at a loss of what could have happened. They put in 8 new plugs and 2 coils that they broke while in the process of removing the intake. F150 5.4 ...
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My truck is leaking behind the engine. There is not any coolant on top of the engine. It's leaking above the transmission and running down the passage sides. Are there any hoses that could be leaking behind. Sometimes it leaks a lot other times it doesn't leak at all. The shop thinks it's a freeze plug but wouldn't it be leaking more if it was?
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My '02 F150 just developed an oil leak. It appears to be coming from the passenger side front. I'm just assuming here, but could it more than likely be the timing cover? I'm 150 miles from home and I'm debating on getting the timing cover gasket on my way home tomorrow. Also, if it is the timing cover, what other gaskets should I replace? Pretty sure the water pump oring.
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I have a f150 with a 5.4L with 354,000 miles on it. It started leaking water somewhere on the front of the motor on the passenger side. it looks like it is under where the heater hose connects to the intake. I guess my question is can the water eat a hole in the intake?
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My serp belt started squealing so I pulled the thermostat housing to inspect the rubber gasket. It looked OK, but I cleaned up both surfaces and replaced with a new gasket, and put it back together. The housing was replaced just a couple months ago along with new hoses. It was not corroded and OK to reuse.
Started the truck up and saw a slowish/steady drip of red Cat ELC dripping on the driveway. Opened the hood up again and carefully inspected around the thermostat housing - no coolant is leaking there.
I did notice the same slow/steady drip coming from just behind and beneath the thermostat housing. See in pic, this is where it is dripping. One other question, what is this plug for on the side of the water pump?
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I just recently had to replace the extension housing on my truck. Well after doing so I went to start it up and top off the tranny fluid and it started to leak out on the left rear side of the transmission near the extension housing. Ive looked and looked and found that the fluid is coming from the top right in front of the extension housing but when i clean it off there seams to be no holes or cracks. It isn't the housing seal, cause it pools in front of that. What could be the issue? My truck is a 01 F250 4X4 5.4L.
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