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  #31 (permalink)  
Old 03-01-2012, 05:34 PM
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Any chance the fan blades were reinstalled/reassembled backwards?
When you don't stop there is constant air flow through the radiator, when you stop (if the fan is backwards) it wouldn't be pulling cooler air through the rad.

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  #32 (permalink)  
Old 03-01-2012, 06:29 PM
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Brian where do the heater hoses connect to the engine? Which hose has the heater valve and where does it connect to the engine? I'm wondering if there is a problem with the heater hose routing and valve location and its causing cavitation in the water pump.
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Old 03-01-2012, 07:52 PM
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Quote:
Originally Posted by 1ownerT
Any chance the fan blades were reinstalled/reassembled backwards?
When you don't stop there is constant air flow through the radiator, when you stop (if the fan is backwards) it wouldn't be pulling cooler air through the rad.

Nope, it's right, I double checked it.

Brian
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Old 03-01-2012, 07:54 PM
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Quote:
Originally Posted by boothboy
Brian where do the heater hoses connect to the engine? Which hose has the heater valve and where does it connect to the engine? I'm wondering if there is a problem with the heater hose routing and valve location and its causing cavitation in the water pump.
It's hooked up exactly as it was at the factory. But Maybe? I don't know. I do know that today it heated up without the vent open, so I know it's just the heater. It will heat up, turn the heater off and it will start to drop back to normal almost immediately. No kidding, turn the heater off, rev the motor a little to get air moving thru the rad and the gauge will come right down.

Brian
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Old 03-02-2012, 11:31 AM
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i still have those mower blades available for testing
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Old 03-02-2012, 04:24 PM
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Stick a mechanical temp gauge in it and see if it does the same thing. You might check the flow in the radiator to make sure the impeller in the water pump isn't slipping.
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Old 03-05-2012, 06:27 PM
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I think you just don't have enough fan on the radiator. I had one of those years ago
(L-head in a 61 American, almsot the same car under the hood) and it would heat up in traffic also. A shroud on the little fan or a bigger fan might fix you up. I think the heater is just coincidental to the problem. You might try one of those Flex-A-Lite plastic fans -- if you can get one small enough in diameter.
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Old 03-05-2012, 08:05 PM
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Yeah Frank, we know how important a shroud is and it would probably do wonders. But honestly it never does it without the heater control valve open.

Brian
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Old 03-07-2012, 03:58 AM
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Try opening the heater valve only 1/4 of the way and see how it runs. The heater supply comes off the water pump. My only guess is that too much water is getting diverted to the heater when the valve is all th way open and the heater doesn't do as good a job of cooling the engine as the radiator does. I've never heard of that problem, but could be a fault in the remanufactured water pump or just someting that goes on with that model and no one has really noticed. I mean the heater would only be used when it's cold out and the colder weather would keep the engine from over heating. Another thought -- where is the temp sending unit? I forget! You might want to try using a temp gun or sending unit in another location. Could just be water flow around the temp sending unit causing it to read hotter, which would indicate a hot spot, but not necessarily the entire engine running much hotter.
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Old 03-07-2012, 04:34 AM
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I know on my '65 the control valve was stuck open, but even on the hottest day, it would run up to the 1st 'tick' on the temp gauge and that was it. Still blew HOT air. just had to leave the ducts closed to keep the heat out on hot days
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Old 03-07-2012, 07:59 AM
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Quote:
Originally Posted by farna
Try opening the heater valve only 1/4 of the way and see how it runs. The heater supply comes off the water pump. My only guess is that too much water is getting diverted to the heater when the valve is all th way open and the heater doesn't do as good a job of cooling the engine as the radiator does. I've never heard of that problem, but could be a fault in the remanufactured water pump or just someting that goes on with that model and no one has really noticed. I mean the heater would only be used when it's cold out and the colder weather would keep the engine from over heating. Another thought -- where is the temp sending unit? I forget! You might want to try using a temp gun or sending unit in another location. Could just be water flow around the temp sending unit causing it to read hotter, which would indicate a hot spot, but not necessarily the entire engine running much hotter.

I never thought of leaving it only partially open, there's a thought. I have noticed that I can open it, get the hot water into the core then close it and leave the fan on and the air is hot for a long time.

Brian
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Old 05-22-2012, 05:30 PM
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Did you ever find the problem with the Rambler?

Later, Frank
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Old 05-22-2012, 05:55 PM
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Never did, other than simply it overheats if the heater is on and the car isn't moving. I am looking into installing a real fan and a shroud. But honestly, never could figure out anything wrong. I drive it every single day and if I am stopped in traffic I can't leave the heater on. I will open the heater control valve for a while filling it with hot coolant, then close it and let the fan run. It works just fine for me so I don't worry about it. But every once in a while I will forget and look down to see a pegged gauge!

Brian
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Old 05-22-2012, 07:17 PM
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Quote:
Originally Posted by ogre
i still have those mower blades available for testing
still have them
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  #45 (permalink)  
Old 05-22-2012, 09:23 PM
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No thanks, that's what I have remember! The bummer is the fan is about a half inch at tops from the core. Then it hangs over the bottom and misses most of the core on the sides. It is a horribly inefficient set up. The water pump has a long shaft that stuffs it against the rad. So there is no room for much of anything else but a flex fan, a 14" flex fan. If it was a little bit aways from the core a nice shroud would work great as it could get the air coming thru the whole core. But this way I am going to have to have a shroud that is only about a half inch away. I still think it will be better than nothing but that is another project that I really don't feel like doing.


For the time being, I will just drive it every day because it "works".

Brian
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