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  #1  
Old 08-01-2011, 01:40 AM
htmja htmja is offline
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Unhappy Just when I thought I had it all fixed.....HELP!

Just finished installing a new water pump, thermostat and bypass hose on my 1996 Dodge RAM 1500. The actual culprit of the leak was that the bypass hose swelled to the point that the clamp cut into it, on the engine connection side (almost did not pull it, good thing that I did!!) Since I had to remove it all I might as well replace what might need replacing

During the process I snapped off the terminal for the coolant temp sending unit so I had to replace it
I decided to run the Prestone Cleaner through the system to give it a good clean out, so just that and water, no leaks! Yeah!

But now my temp guage spikes to the last zero in 200 (so 230 degrees) on the guage and just sits there. Ran the truck for about 2 hours and it never went down or up. I even squeezed the upper radiator hose thinking I had a trapped air bubble and still it will not go down.

Before the leak, the temp guage went through the normal operating range of up to 220, thermo would open and it would drop to 190 or so.

Is it possible that the new coolant sending unit is bad?

I did notice that the upper radiator hose does get hot as normal but the lower hose barely gets warm. Is that normal? Does it mean that it is cooling properly?
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  #2  
Old 08-01-2011, 02:04 AM
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sonocativo sonocativo is offline
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Did you put the new thermostat in correctly, If it is in upside down it wont open due to the water pressure from the pump.
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Old 08-01-2011, 02:08 AM
htmja htmja is offline
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Installed it spring down
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Old 08-09-2011, 11:53 AM
htmja htmja is offline
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Replaced the new coolant sending unit, now the temp gauge will fluctuate with the opening and closing of the thermostat, barely. Burped the system, so no trapped air pockets. The temp range is still running higher than before the repairs ( around 220 now, before it was 190-200 ).

Any ideas as to why it is so high?

On a side note, I noticed a turn valve on the radiator, lower left (if sitting in the truck). Thought it was a drain valve for the radiator but when I turned it nothing came out. Is it just plugged or is it something else?
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Old 08-09-2011, 12:39 PM
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snrusnak snrusnak is offline
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I also am thinking thermostat installed backwards. That plug in the radiator could be for auto trans cooling lines if you are a manual trans...
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Old 08-18-2011, 10:28 PM
htmja htmja is offline
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[QUOTE=snrusnak;586696]I also am thinking thermostat installed backwards. /QUOTE]

Installed it spring side down. Also, the upper radiator hose does get hot
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Old 08-23-2011, 01:47 AM
Gen1dak Gen1dak is offline
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Sounds like that Prestone coolant system cleaner knocked some rust loose and has partially clogged your radiator.
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Old 08-24-2011, 12:17 AM
htmja htmja is offline
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So I would have to pull the radiator and do a flush on it or will the 50/50 coolant blend eventually deteriorate the rust and clear it up?

Still puzzled by the turn valve on the lower left part of the radiator and its function.
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Old 06-16-2012, 11:05 PM
cewilford115 cewilford115 is offline
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Im having the same troubles in my pickup the temp sensor broke while I was changing the valve cover gaskets. I replaced the sensor and Im going to try disconecting the battery (Reset the computer). If you came up with any ideas or found anything let me know. I will do the same for you.
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Old 06-17-2012, 12:30 AM
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snrusnak snrusnak is offline
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The "turn valve" on the bottom of the radiator should be a drain. They are often plastic and have steep threads so it only takes say 1/2 turn to get it wide open to drain.
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