coolant flow through the manifold on the 2.5 (Page 1/1)
handymanpat MAR 24, 11:23 PM
On my 86 iron duke, I have attempted to flush out all the lines, hoses, radiator and the heater core. I am not getting circulation through the heater core. I even pulled the water pump trying to figure out why there in no flow. I thought maybe the impeller has come loose from the shaft and it was not spinning.
I get coolant from the heater core connection up front to all the way in the back where the hose connects to the metal tube that goes into the bottom of the carburetor or manifold area. at that point I do not get flow past there.
Is there a valve or something that could be stuck? or does it need to open somehow to allow the flow through the system and to the front of the car?
I have spent a couple hours looking at a repair manual and on the internet and cannot find what goes on when the coolant get up there to that point.
Im sure it is something simple but I an not finding it. I pulled the hose off heater hose of the water pump and nothing was coming out while the engine was running and the system was full. That is why I thought it was the water pump.
Thanks for any advice about what is going on.
Thanks Pat

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pat moody

mountainman MAR 24, 11:46 PM
If I recall correctly, on my 88 duke the heated water flows from the intake manifold to the heater core and then back to one of the lower coolant lines. On my car the fitting on the underside of the intake manifold is a quick release fitting. It was blocked right at that fitting. Ended up taking off the intake manifold and unscrewing that fitting. Corrosion had plugged up that fitting. j
handymanpat MAR 25, 05:56 AM
I am familiar with that quick release fitting on that 88 duke. I imagine this is the same sort of thing just not a quick release fitting, instead it is just clamped on with the 86 model.
Well, that makes sense that there could be some clog in that location. It seems like I was not getting a circulation through to the heater core!
I was just hoping there was a valve that maybe opened like a small thermostat or some device like the idle air control valve but for a water valve that opened and closed.
Thanks for getting me looking in the right direction.
Pat
theogre MAR 25, 10:08 AM
86 and older can still have same blockage in the engine. Block can be outlet port, in the intake man, or both. Intake passage and port are relatively small to rest of heater plumbing.
See my Cave, Heater

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

handymanpat MAR 25, 11:38 AM
That HAS to be it!
It’s a good day when you get a response from the one and only ogre!
Thank you guys so much for the advice. I am convinced this is the issue. I will check in and post how it goes.
Thanks again for letting me know
Pat

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pat moody

theogre MAR 25, 03:07 PM
If car runs...
"Easy" to back flush the intake port w/ garden hose a bit.
Might be temp fix but tell you if it's the problem before you take things apart or do a full system flush.
handymanpat MAR 25, 10:13 PM
Great news!
I unscrewed the 1/2 inch threaded water plug on the manifold. There was crud on it and in the area. This car had sat for 9 years.
I back flushed from the heater core hose and it washed out the stuff in it, I then flushed through the other hose and really put the garden hose to it. I was able to get the junk out!
I knew something crazy was going on but I never imagined that something like this could happen. I just figured the heater core was clogged or the water pump had stopped working.
I sure appreciate you guys being able and willing to answer question like this. It is so much fun to work on these cars but sometime I hit a dead end and that when I am very grateful that this forum exists!
It was a real honor to have the Ogre chime in, how cool is that!
Thanks Pat

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pat moody