Coolant leak '99 Plymouth grand voyager



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Thread: Coolant leak '99 Plymouth grand voyager

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    Coolant leak '99 Plymouth grand voyager

    Sorry if this has been asked and answered here, but I couldn't for the life of me find it....maybe cause I don't know exactly what I'm looking at.

    Anyway, I have a '99 Plymouth grand voyager SE 3.3 with a coolant leak. I replaced the radiator, water pump, and upper and lower hoses last week and the car is still leaking like a sieve. If I pressurize the radiator, the leak seems to be coming from a hose that leads underneath the thermostat housing/water box down into a pipe that (I think) is attached to the timing chain cover. I replaced that hose but the leak still continues. Could there be a small pinhole in that pipe causing the leak? What exactly is that pipe? Do I have to replace the whole timing case?

    Any help would be greatly appreciated. I have no problem doing the work myself, I just don't know what part I actually have to get. Thanks in advance.

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    Look at where it is leaking from carefully. That hose does connect to an outlet on the back of the timing cover, behind the water pump. It's possible that either the hose, or the clamps at either end are leaking. It's also possible that the t-stat housing gasket is leaking. It is also possible that the leak may be coming from the timing cover gasket. In that area, there is a coolant passage from the engine into the timing cover. It is sealed by an o-ring that sometimes gives out, causing the coolant to leak. Once the o-ring gives out, the coolant may leak past the gasket and out the back of the timing cover. Does the leak look like it is coming from the top of the timing cover? If it is coming from below, there is another inlet directly behind the water pump that leads to the metal heater return tube. These have a tendency to rust out over time and spring a leak.

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    Quote Originally Posted by Mmshmoo View Post
    Sorry if this has been asked and answered here, but I couldn't for the life of me find it....maybe cause I don't know exactly what I'm looking at.

    Anyway, I have a '99 Plymouth grand voyager SE 3.3 with a coolant leak. I replaced the radiator, water pump, and upper and lower hoses last week and the car is still leaking like a sieve. If I pressurize the radiator, the leak seems to be coming from a hose that leads underneath the thermostat housing/water box down into a pipe that (I think) is attached to the timing chain cover. I replaced that hose but the leak still continues. Could there be a small pinhole in that pipe causing the leak? What exactly is that pipe? Do I have to replace the whole timing case?

    Any help would be greatly appreciated. I have no problem doing the work myself, I just don't know what part I actually have to get. Thanks in advance.
    That hose is the bypass hose. It keeps the water circulation in the block when the thermostat is closed and keeps warm water to the thermostat to help it open on time.
    The fitting on the top side of the hose that goes into the intake manifold is rather thick and would take a long time to rust out. The lower fitting (pipe) is thinner and tends to rust out faster. It is pressed into the timing cover so you would have to remove the cover to do anything with it.
    Also the intake manifold gasket is very close to the bypass hose so check to see if it is leaking and spraying out onto the hose.
    If the timing cover seal fails it will look like this.
    Attachment 5618
    2013 TC Limited Black/Graystone Custom ordered 5/13
    Luxury non Stow & Go buckets.Blu ray player and Tow. Driven to 26 states so far. Mainly our vacation/road trip ride.
    1994 Grand Caravan SE Sport, 3.3L, 332,000+ miles and counting. Original engine and trans. Bought it new and have driven it to 48 states. My daily driver.

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    Thanks for the prompt suggestions!

    I've dried up all the wet areas and pressurized the radiator. The leak is definitely coming from the area where the bypass hose goes into the fitting behind the water pump where the timing case is. I'm going to pull everything off tomorrow and replace the hose and the gaskets and see if that works. If not I guess I'll be junkyard scavenging for a timing case cover.

    I'll try and update as I go. Thanks again!

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    Did you look closely with a flashlight to see exactly where the leak is coming from? I have heard of the pipe coming from the back of the water pump loosening up and leaking (and sometimes falling out), but it seems more common for the timing cover O-ring/gasket to fail. Looks like if either one is leaking you will have to replace the timing cover anyway (or fix it). New timing covers are cost prohibitive, and difficult to get. I believe one member reattached that pipe with JB Weld and traded/sold the van.

    I had to replace the timing cover gasket/O-ring on our van once, and it is leaking again 20,000 miles later. I used the Fel-pro gasket kit, and that may have been the problem. Next time I am using the OEM gasket and O-ring as it is a different material. Also, you have to drain the oil and remove the oil pan to remove the timing cover, because the oil pump is in the timing cover and the pick-up tube connects to it. It's kind of a big job that takes a whole weekend to do.
    DAN(husband of member STEPHANIE)

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