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My mb100 van 1997 model has water leak at the back rear engine.the radiator is ok and the water pump.is there a water hose or port at the rear side of the engine?what and where is the cause? thanks, ermee

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You may have a leaking core or welsh plug. This is a large disk which is used to block off the holes left behind by the casting process during manufacture. They are easy to replace but difficult to access.. It may also be a leaking hose or even a cylinder head gasket but I would suspect a welsh plug first. Take the vehicle to your local garage and get them to pressure test the cooling system, this will show up the leak a lot easier..

Posted on Aug 02, 2010

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How to change top radiator hose on 1997 dodge conversion van with a 5.2 motor


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Sep 01, 2012 | Dodge Ram 2500 Cars & Trucks

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Need to know where the thermostadt is at. Have leakage but can't find any hoses etc leaking.


If you have the V6 (2.5L) engine, be advised: it's a wearing task. Just getting to the radiator drain plug can be a problem without a 3/8 inch drive ratchet, a 3 inch extension, a universal joint. and a 19 mm socket. The drain plug is on the passenger side of the radiator on the engine side. The 19mm socket will fit over the drain plug to turn it open.
The coolant plumbing on this engine is the craziest I have ever seen. The thermostat is on the rear face of the engine (where the radiator hoses connect), but not on the upper hose where it connects to the upright pipe with the radiator cap on it, it is on the lower hose connection. Pull that hose off the housing, and remove the three bolts holding the thermostat housing to the engine. It will help if you first remove the big air inlet hose from the air filter housing to the throttle body. I wouldn't even bother with the thermostat till you have found the leak. Is any coolant leaking from the front of the engine, dripping off the bottom behind the crank pulley? That would be a water pump problem or SEAL, an o-ring on the back of the water pump. Now get on the driver's side and look around on the rear of engine nearest the firewall where engine and transaxle mate. Look down there for signs of coolant coming from rear of engine and running down onto the transaxle case. There is a metal pipe laying in the valley below the lower intake manifold, connecting the water pump at the front and the rear housing where the radiator hoses and heater hoses connect. This metal pipe uses an o-ring for a seal into the water pump, and the same size o-ring to connect to the rear housing. If one of those o-rings is leaking, you have a big problem getting to it.. I took the rear housing off once (never again!), Now I'm taking the water pump off to fix a leak. The water pump is run by the timing belt, so the front of engine needs to be stripped down, and the timing belt removed to take off the water pump. That metal pipe is held in place by a bracket with one bolt on the rear of engine; it may require taking the lower intake off (again) to get to both of those pesky o-rings. I hope you don't have the same problem, and if you have the 4 cylinder engine, the thermostat is a snap to replace, plus you don't have that crazy plumbing problem.

Apr 01, 2012 | 1997 Chrysler Sebring

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It overheats and it is leaking antifreeze from the back of the motor and i cant seem to find where it is leaking from


I don't have a Mazda, but could suggest a couple of ideas. Leaks can be a pain to locate, especially in the cramped engine compartment of a mini van. These were designed to be assembled by the factory, not to be easily worked on later.

Are the heater hose lines from your engine to the heater core at the rear of the engine to the fire wall OK? Run you hands along them and see if you get your fingers wet. You could have a leak there.

Is the freeze plug on the engine block OK and not leaking? My Plymouth van had a freeze plug on the block that leaked and I had to replace one. (Real pain) I also had a water pump fail. My water pump was operated by the cam belt. When the bearing fails, the first indication is a small leak. On my vehicle, there was a small passage that would allow fluid to leak near the rear of side of the engine on the passenger side next to the crankshaft pulley. This was designed to keep the fluid off the timing belt. Mine dripped along the casting and dripped on the ground which made it appear to be coming from someplace else. You will have to get under the vehicle with a light to do a more detailed inspection to get an idea of where the leak is coming from.

Depending on your mechanical experience, you might want to have a trusted service station take a look. Just remember, you don't have to have the work done if you don't want to, but they may require an inspection fee. Ask up front.

As far as the overheating you might be low on fluid. Make sure you stay on top of the leak by filling up the radiator over flow bottle and the radiator itself. Do not check the radiator when hot. When the engine is cool, you can remove the radiator cap and fill the radiator directly up with a 50/50 mix of coolant and distilled water if needed. Some coolant is also offered already premixed 50/50 at an auto part store. After filling, with the cap still off, start the engine and turn on your heater to full hot. The pump will lower the coolant level in the radiator as it pushes it through your heater core and engine. Add more fluid until full. When the engine worms up, the fluid will start to expand and start to overflow. Quickly reinstall the cap. Doing this should remove most of the air from your system and take care of your overheating. (I am assuming your pump is working, radiator fan is working, thermostat is opening, and your radiator is not clogged). When your radiator is full of coolant, you can then keep up with the leak demand if it is not excessive by filling up your overflow as needed until your leak is fixed.

Again, leaks can be a pain to find.

I would look for:

· Leaky heater hoses

· Replace radiator cap if over 7 year old

· Overflow bottle has a leak??

· Water pump on engine has a worn bearing and the weep hole is allowing fluid out to indicate a worn out bearing.

Overheat problem: (check in order)

· Leak has caused a large volume of air to enter engine coolant system and it needs to be filled back up.

· Cooling fan on radiator not working.

· Engine thermostat not operating.


I hope these suggestions help you find your leak and deal with your overheating problem.


Todd.

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1 Answer

Overheating radiator on my 1997 EL Falcon. It seems to be leaking in the back of the engine on the passenger side which is causing the radiator to overheat and have hardly any water in it. I have replaced...


Your wasting your time and money doing that lot as your problem is either the heater hose on L/H/Side of engine split or leaking tap for heater or head gasket or the REAR CORE PLUG in rear of engine block rusty and needs replacing (dead centre of rear of block) but you will need to either use a mirror to see it or remove the engine and replace ALL welsh plugs.
Let me know how you get on.
Ron

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1997 north star coolant leak at top left side of engine.only leaks after cool down not running.


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When driving my 1997 Dodge Avenger its fine until I come to a stop alot water leaks from engine its not from the radiator or the water pump


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I replaced my water pump and belts on my 96 bmw 318is. I started it up and the coolant is leaking from the rear of the engine, not from the water pump. Are there hoses near the back furthest away from the...


ON THE BACK OF THE HEAD THERE IS A PLASTC PIPE WITH TWO HOSES COMING OFF IT THESE TEND TO CRACK AND LEAK WITH AGE SO IF THE LEAK IS FROM THE BACK OF THE ENGINE THEN THIS IS MORE THAN LIKELY THE PROBLEM THEY ARE ONLY£4 NEW FROM GSF I HAD TO REPLACE MINE THE PTHER DAY.

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