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Location: south germany | hi folks, must change the the old radiator cap of my 57 dodge coronet, 5.3. In the shop manual says 12 -15 psi radiator cap. The lettering of the old one is unreadable. Whitout an thermostat, drive only on warm days. I have a new one on stock with 13 psi. Will this be fine? thx |
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Location: Under the X in Texas | First you should be driving with a thermostat at ALL times. The engineers put the thermostat there to get the engine up to efficient temperature and keep it there under all conditions. The thermostat has nothing to do with any overheating problem you may have encountered which caused its removal unless it was stuck closed. Thermostats protect valves. Put a thermostat back in the engine.
The 13 pound cap is fine. |
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Location: south germany | i only drive the car in summer season. |
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Location: Under the X in Texas | Ask any good mechanic if your car should have a thermostat. Don't take my word for it then. Good luck if you don't. |
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Expert 5K+
Posts: 7395
Location: northern germany | steve, follow outtheres advice, you will need a thermostat, even in africa. |
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Expert
Posts: 3776
Location: NorCal | Lude74 - 2015-06-28 9:55 AM
i only drive the car in summer season.
Thermostats aren't only about controlling temperature but they also control the flow. Too much coolant flow can contribute to overheating (some disagree). |
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Temporarily suspended to cool off
Posts: 316
| StillOutThere - 2015-06-28 5:45 AM
First you should be driving with a thermostat at ALL times. The engineers put the thermostat there to get the engine up to efficient temperature and keep it there under all conditions. The thermostat has nothing to do with any overheating problem you may have encountered which caused its removal unless it was stuck closed. Thermostats protect valves. Put a thermostat back in the engine.
The 13 pound cap is fine.
too right! Not only that, but without a thermostat, it actually can screw up the flow of water through the heads. |
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Temporarily suspended to cool off
Posts: 316
| Lude74 - 2015-06-28 9:55 AM
i only drive the car in summer season.
Doesn't matter, without one there, the rear cylinders will fry! but hey, what would I know, I just happen to fully understand how and why the colling the system is the way it is!
But go ahead, destroy your motor, no flint off my skin. Think about it this way though. These cars didn't overheat when they were new, if they are now, it's an indication of a problem somewhere. I broke off some exaughst manifold bolts in my heads a few months ago and pulled the heads last week to remove the broken studs. This actually turned out to be good fortune. There is no way this car wouldn't have overheated. Some idiot put stop leak in this engine and it plugged every single one of the restricted coolant passages between the block and the head. The flow pattern on this engine would have spelled death for it doing anything other than grocery runs!
I swear man... some people. |
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Expert 5K+
Posts: 8947
Location: WHEELING,WV.>>>HOME OF WWVA | 100% agree , Too much coolant flow can contribute to overheating (some disagree). been there , several times , yrs ago -------------------------------------------------------later |
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Location: south germany | ok, i let the thermostat inside. thank you to all |
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Elite Veteran
Posts: 982
Location: Upper Hunter NSW Australia | ..........
Agree with all of the pro thermostat replies above.
The engine is designed to run at a set temperature range, throw out the thermostat and all the reason for this design gets thrown out with it.
If there is a cooling system issue and there is no fault in the thermostat, then another cooling system component needs to be looked at.
Too often the poor old thermostat gets the blame for everything else wrong when a full system check would have revealed the real problem.
I've pulled down many thermostat-less engines in my time as a mechanic and believe me, the amount of measured wear that can be found in an engine that has been ran without a thermostat for a lengthy period is substantial indeed.
You've made the right choice to retain the thermostat.
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Temporarily suspended to cool off
Posts: 316
| VAN HELSING - 2015-06-30 10:08 PM
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If there is a cooling system issue and there is no fault in the thermostat, then another cooling system component needs to be looked at.
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I noticed when I tore the heads off the polyhead in my phoenix almost ever one of the block to head passages that are restricted via the head gaskette, were plugged solid! I wonder how often that's the source of cooling problems on mopars. |
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Location: south germany | i´ll do, i love this vehicle! thank you for your honest help in this to all !
Edited by Lude74 2015-07-01 4:23 PM
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Elite Veteran
Posts: 982
Location: Upper Hunter NSW Australia | Polybun - 2015-07-02 1:10 AM
VAN HELSING - 2015-06-30 10:08 PM
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If there is a cooling system issue and there is no fault in the thermostat, then another cooling system component needs to be looked at.
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I noticed when I tore the heads off the polyhead in my phoenix almost ever one of the block to head passages that are restricted via the head gaskette, were plugged solid! I wonder how often that's the source of cooling problems on mopars.
Some engines are designed with overly generous block to head coolant transfer passages that hardly ever block up and some are designed with small diameter passages that can block up with rust scale over time from an owners neglect of cooling system maintenance. Incorrect or incorrectly install head gaskets are also a major cause of some cooling system problems along with the many other causes that are so eagerly blamed on the thermostat.
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Edited by VAN HELSING 2015-07-02 6:01 AM
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Expert 5K+
Posts: 8443
Location: Perth Australia | I have to admit to the head gasket mess up
I replaced head gaskets on a customers (that made it worse, if it was mine, it wouldnt have been such a problem) Ford and I put one gasket on upside down and it blocked the passages to 1 head
Took ages to work out what I did wrong, but luckily, apart from a new gasket or two, there was no damage to the engine
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Location: south germany | ...reinstalled...it´s done... |
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new radiator cap, psi
