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Big heating-problems with 400ci on PLymouth Satellite

I agree with 747, you need to pull the pump and inspect. Something is really wrong somewhere I’d put my money on the pump right now.
 
I agree with Ron H..... something does look off with that fan/shroud set up. At higher speeds, the air flow may “stall” and have the opposite effect it should. Do you have a stock set up to try on it?
 
I'm not following why we're still talking about the fan:realcrazy:, maybe the shroud restricting it but I doubt that as well. A simple test would be to just take the shroud and all off and go for a spin avoiding any traffic or slow speeds, if it still gets hot with zero restriction at cruising speed you've eliminated the fan/shroud.


Also don't ever let the fact that something is new be a means of ruling it out either, every failure I had during my build was a brand new part that didn't work right out of the box.
 
Is the seal between hood and rad support there and in good shape
 
I would also be looking at the water pump next. Especially sitting there idling with the fan running and it still doesn't cool down. That, in my mind, says water flow issue as well. Maybe the impeller doesn't move enough water or is spinning on the shaft when it gets hot?
 
Pull the pump, gasket may not have ben punched and blocking the passage.
Also you could have a big air pocket, they sell an adaptor that lets you pull a vacuum on the cooling system and once you verify there are no leaks ( like an ac system) you open the valve a d only coolant is allowed to fill the block &. radiator. This is the one I have.

https://mobiledistributorsupply.com...MIm5LM4uaL3gIV3LXACh1qrwn4EAkYAyABEgL1wfD_BwE
 
We did replace the pump ( i know that its not guaranteed that a new part is working) but we have the same result with tho old an the new pump.

The only thing im also thinking about is that the water dont flow because of somthing inside the engine. I talked to the meccanic who replaced the headgaskets (hes fired since 3 Weeks) he told me that he blocked the water passages in the intakemanifold gaskets. but he told me that shoud not be the problem, its even better that the manifold is not heating up by the water........ I dont now if this is true, but maybe this is the problem.?. On the other side the result of the cooling is the same as before with the non replaced headgaskets and the non blocked water passages.

I think easiest for a next test would be to remove the shroud and see what happend.
 
There are no water passages in the intake. I’m confused now.
 
So those are just the heat crossover for carb heat. Not coolant and probably good they are blocked anyways. What heads are on the motor? I recall there being some late ‘70s motor home engine heads that take special head gaskets. Or I’m imagining reading that somewhere

The more I keep looking, it appears I imagined reading this somewhere.
 
Last edited:
Is the thermostat upside down? I have seen that.

Overall sounds like a problem in the block, something blocking proper flow. That, and possibly generating way too much friction/heat to begin with. Piston size/rings/oiling?
 
BLK 68 R/T said:
So those are just the heat crossover for carb heat. Not coolant and probably good they are blocked anyways. What heads are on the motor? I recall there being some late ‘70s motor home engine heads that take special head gaskets. Or I’m imagining reading that somewhere
Click to expand...
I can not exactly tell you what heads they are, we wasnt build the engine. All i know is that its a 400ci
 
Charger Dana said:
Is the thermostat upside down? I have seen that.

Overall sounds like a problem in the block, something blocking proper flow. That, and possibly generating way too much friction/heat to begin with. Piston size/rings/oiling?
Click to expand...
No thermostat is defently the right side up.
 
I have seen where people push the soft plugs into the block when the rust out. Then push new plugs into the block. That could cause a restriction especially if there are several soft plugs driven in. Sure sounds like a water flow problem to me. That electric fan looks like a black magic fan which flows 3000 CFM. I have used them before they are great.
 
No sory, i didnt had the time to remove the shroud and went to a cruise. I check if i can do it today.
 
Trash the electric setup, install a factory clutch fan & shroud. That will remove any doubt about airflow at higher speed. Then you can narrow it down to water flow issue. If, as you say, there are no issues mechanically with gaskets, clearances, timing, etc. It boils down (pun intended) to air flow & water flow.
 
After the test we saw cool temp on the autobahn, but hot when cruising back on normal streets....
We tryed out now with a fan without shroud.
 
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