Pictures of cooling system on 1999 3.2 - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 23 (permalink) Old 12-01-2018, 11:17 PM Thread Starter
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Pictures of cooling system on 1999 3.2

I am having an issue with loosing coolant when the auto gets to operating temp, and keeps leaking until pressure in cooling system is gone. From what I can see the coolant is leaking from the rear of the engine. Several posts talk about a connection on the rear of the engine centered in the "V". I cannot find that connection is any manuals I have, and cant find a picture either. Does anyone on this forum have cooling diagrams and/or pictures of what I am looking for?

Thanks
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post #2 of 23 (permalink) Old 12-02-2018, 01:35 PM
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Download the FSM here:

https://www.dodgeintrepid.net/manuals/02lhe/02lhe.pdf

Then look at page 7-25. There's a very good possibility that the Heater Supply Tube has rusted or the O-Ring that seals it to the bottom of the Lower Intake Manifold is leaking. It's common on older cars. Yours is 19 years old now.
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post #3 of 23 (permalink) Old 12-02-2018, 01:40 PM
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Could also be the water pump leaking and it's coming out the top weep hole in the engine vee and traveling backwards.

When was the last time the Timing Belt/Water Pump were changed?
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post #4 of 23 (permalink) Old 12-02-2018, 03:39 PM Thread Starter
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FANTASTIC! Thanks. I can assume that the 3.2 and 3.5 engines are the same for this issue? one other question, is there anyway to see this connection without removing the intake manifolds, like just removing the air intake housings?

Thanks again.
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post #5 of 23 (permalink) Old 12-02-2018, 03:42 PM
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Both engines use the same Intake Systems. And no you can't see really see anything without disassembling the intakes.
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post #6 of 23 (permalink) Old 12-02-2018, 03:43 PM Thread Starter
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I check the WEP area and did not see any leakage. The engine is dry as best I can see. This vehicle has a 127,000 miles on it and runs great. I have not replaced the timing chain or water pump. I may now since I have to do some work on it. I am the original owner, so I know it has been well maintained.
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post #7 of 23 (permalink) Old 12-02-2018, 03:47 PM
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The 3.2/3.5 have a timing belt not a chain.
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post #8 of 23 (permalink) Old 12-02-2018, 11:01 PM
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I agree with Ronbo. If you're sure it's coming from the rear of the engine then it is most likely heater hose related. Water pump leak will be close to the front coming out of the timing cover and dripping off the front of the oil pan. Either way, you're going to want to do the timing belt and water pump on it soon since they're original.
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post #9 of 23 (permalink) Old 12-03-2018, 01:57 AM
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Quote:
Originally Posted by codyj View Post
I agree with Ronbo. If you're sure it's coming from the rear of the engine then it is most likely heater hose related...
Actually, on the 3.2/3.5, he’s talking about where the metal heater core supply pipe connects to the underside of the lower intake manifold (o-ring fails or pipe rusted out) vs. the heater core supply hose, though you are correct - the heater core supply and return hoses also should be ruled out.
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post #10 of 23 (permalink) Old 12-03-2018, 10:06 AM
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Originally Posted by peva View Post
Actually, on the 3.2/3.5, hes talking about where the metal heater core supply pipe connects to the underside of the lower intake manifold (o-ring fails or pipe rusted out) vs. the heater core supply hose, though you are correct - the heater core supply and return hoses also should be ruled out.
Yep. Even mine are pretty rusty on the outside without seeing salty roads and what not. It seems like those are the only things under the hood that have rust on them for me.
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post #11 of 23 (permalink) Old 12-04-2018, 01:31 PM Thread Starter
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While I have the intake manafolds off, I'll look at the heater core lines too. I live in the southwest, so no salt, garage kept, and very little water to cause rusting.
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post #12 of 23 (permalink) Old 12-15-2018, 08:40 PM Thread Starter
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OK, i took the air intake out, removed the cowling (Below the windshield) parts which opened up a view of the coolant pipes/hoses on the back of the engine. I pressurized the system to 18lbs. After about an hour, coolant started to leak out. Nowhere on the engine could I see or feel coolant leaking out of the pipes and hoses. The coolant I see leaking is coming out between the engine and transmission connection. I can see the coolant running down the seam and leaking out the bolts. What can cause a leak to only come from this area?

Dan
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post #13 of 23 (permalink) Old 12-15-2018, 09:17 PM
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Are you 100% sure the leak is originating between the engine and transmission? The only way coolant can flow out of there is a cracked block, I'd assume. Maybe run your hand around the rear of the lower intake manifold. My money is still on that area.
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post #14 of 23 (permalink) Old 12-16-2018, 12:59 AM Thread Starter
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If the heater supply tube's o-ring was leaking, wouldn't it go into a cylinder and burn, not leak out on the engine block? I can see and feel the lines coming off the heater supply tube and there is no sign of leakage there. I can see the coolant tubes and feel them and they are dry, so I do not believe the heater supply tube is bad. the coolant is oozing out of the cracks between the trans and engine block, pretty positive about. I dry the crack and coolant appears within seconds. If the block was cracked, wouldn't I see bubbling in the coolant tank and wouldn't build it up too much pressure and set off the tank cap?
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post #15 of 23 (permalink) Old 12-16-2018, 01:08 AM
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That heater supply tube connects to the bottom of the lower intake manifold and is a water passage. It's leaks on the top of the "VEE" of the engine. It's not connected to the combustion chambers in any way.

You're not going to find this unless you do some disassembly. Get back to us when you're ready to do that. Otherwise you're wasting our time.
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