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Elite Veteran
Posts: 705
 
Location: California | Did some maintenance on my v8 57 savoy. Radiator rodded out removed freeze plugs flushed water jackets then new freeze plugs. New water pump. New 180 thermostat. Now the cooling system pumps over a gallon of coolant out the rad overflow tube before the engine is fully warmed up.have tried a new rad cap and a good tried and true cap off my 57 belvedere. Any ideas guys? |
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Expert
Posts: 1737
 
Location: Hay Lakes, Alberta, Canada | Sounds like something is over pressurizing. Is the thermostat installed the correct way, not upside down? When you cleaned the passages, maybe some junk came loose, and plugged up the water pump or housing?  |
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Elite Veteran
Posts: 705
Location: California | Thanks for the input. The thermostat is in correct. I did ask my radiator guy about it and said I bet you have a Napa thermostat in it. Yes was my answer. He says they stick frequently and to get one from O'Reillys. Going to try that out tomorrow. |
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Expert
Posts: 2120
Location: atlanta | boil some water with the thermostat and a thermometer in it, see if and where it opens.
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Expert
Posts: 1231
Location: York County, PA | They are not that expensive, get a new one.
Catch ya later.
Thank a vet. |
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Extreme Veteran
Posts: 397
Location: Milano, Italy | <p>This is a thing that happens every time the cooling circuit is opened ( change of a head gasket, replacing the thermostat and so on) You simply need to leave the engine running without the cap on the radiator until the water reach its operating temperature. then the thermostat opens and gulps out one or two times, expelling all the air out of the circuit. After that the cap is put back on the rad and everything runs normally. Alternatively, you can drill a very thin hole in the side of the thermostat body, so that there is a "bypass" for any air trapped. (this is what I have done) But this does slow the time for the engine to reach the operating temp.</p>
Edited by lonesome mopar 2015-06-26 12:45 PM
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Elite Veteran
Posts: 705
Location: California | I've done that several times. |
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Expert
Posts: 1730
Location: Michigan | What is the pressure stamp on the radiator cap? 7? 13? |
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Expert
Posts: 2312
Location: Arizona | Sounds a bit like a head gasket gone bad. Esp if it's doing this before it's even fully warmed up. I'd be inclined to remove the thermostat, leave the radiator end of the upper hose off and start the car and see if the water pump is pumping. If there isn't good flow the impeller might have come loose from the shaft. If it is pumping whatever seems "normal", I'd top up the radiator, then pull the lower hose and verify that you get a good whoose of water draining out. reconnect the top hose, bottom hose still off, then try filling the radiator with a garden hose. My experience with such an attempt is that a good flowing radiator is pretty hard to "fill" with the bottom hose off, not necessarily impossible, but it takes a while. If you can easily "fill" the radiator perhaps a lot of the tubes have gotten clogged or got soldered up when you had it redone. You could even disconnect both hoses and reverse flush it from the bottom. Since it's pumping a gallon of water into the overflow it seems likely that either the water pump is working and something is clogged and/or the wp isn't working and the engine is getting too hot due to no coolant flow and then boiling out the coolant. Or the HG went bad. |
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Elite Veteran
Posts: 705
Location: California | The thermostat appears to have been the issue. |
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Expert
Posts: 2312
Location: Arizona | That's too easy!! |
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Temporarily suspended to cool off
Posts: 316
| http://www.summitracing.com/search/product-line/flowkooler-robertsh...
Get yourself one of these, and never need to replace one again for the wrest of your life! Robert shaw supplied the OEM units in some mopar engines. These are super nice valves, respond quickly, and flow like hell when they need too. When you get them, you'll notice right away that the design is pretty different from el cheapo made in china ones. |
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Elite Veteran
Posts: 705
Location: California | Cool I will do that! Hate to have one of the cheapo ones fail while on a road trip. |
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cooling system emptying itself.
