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eating thermostats

 
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  #1 (permalink)  
Old 02 Jun 2014, 10:32 pm
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Thumbs down eating thermostats

Hello... 2001 cruiser 2.4

Lemme start with the basics:

Prestone flush ran through system, 6 hours per recommend. Drain, flush.. then

New radiator, uppr.lower hoses, temp sending unit at thermostat housing, new filler tube, and new overflow bottle (aftermarket ) mounted high so fluid always in the hose..new superstat from stant, stant cap

Temp was riding 3/4 mark before repair, would slowly push more and more fluid into bottle but never draw it back in at cool. After all the above, all works better, save for the poor little thermostat. They only last a couple of days before they stick open. Stant superstat survives the longest holding the record for 4 days before it stopped opening at warm up. Yes, its ddesigned to fail open, yet temp gets up to 216 with the fan on but upper hose is cold...not warm, cold. If, at that point, I drive the vehicle, it bursts open and temp goes back to norm and works fine all day. Same repeated drama every morning. Replaced with 3 subsequent thermostats and all 3 have stuck open, failsafe design or no. I currently am fed up and decided to reach out before thermostat 5. I have followed the procedures in the Haynes manual for bleeding air from the system, 50/50 mix green coolant.. thats all that has been in it since buy stock ill make ya rich lol. The air conditioning is reclaimed for the repair, was gonna recharge when temp stable but now I'm realizing that the low fan never kicks in ...is that only when ac charged? Yes, I tested the fan, jumped both wires from hot and both modes spin... High cycle kicks in at 212 faithfully. help... Ask me anything, suggest anything... Supposed to be moving outta state but......
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Old 02 Jun 2014, 11:43 pm
JDB JDB is offline
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Default Re: eating thermostats

A few notions, Boom. First, and PLEASE do not take offense. Are you SURE you aren't putin' them in upside down? It is a VERY common mistake which I'm sad to say I HAVE made...more than once in my nearly 50 years wrenching. LOL

I've never replaced one in a PT, but in most cars, the pointy bit goes up. Not sure the PT even has a pointy bit...OR if it goes up if it does, but it can make them act like they are stuck open.

Second, did you take care to bleed all the air out of the system with the little bleeder valve on the thermostat housing? Not sure how it would eat stats, but who knows?

And lastly, did you find any junk in the stats you took out. Like maybe there is scale that was loosened up by the flushing, circulating around in the system and hanging it open? If so...well you know the drill. Drain flush with clean water and repeat till clean. ;~)

Those would be my first thoughts.

OH...and make sure about the radiator cap. As a matter of fact, if you still have the old one, put it back on an try it. It IS possible to get a bad cap. I've also had that happen...TWICE! ;~0

Last edited by JDB; 03 Jun 2014 at 12:04 am.
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Old 02 Jun 2014, 11:51 pm
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Default Re: eating thermostats

Its not the the STANT thermostats. Why do I say this because in the last 45 days I have serviced 7 vehicles all my choice of thermostat is STANT Superstant none have failed.


Personally I think you have bigger issues and would suggest to pressure test the cooling system followed up be a chemical test for a blown gasket or cracked head.
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Last edited by NitroPT; 02 Jun 2014 at 11:56 pm.
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Old 03 Jun 2014, 06:29 am
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Default Re: eating thermostats

Quote:
Originally Posted by JDB View Post
A few notions, Boom. First, and PLEASE do not take offense. Are you SURE you aren't putin' them in upside down? It is a VERY common mistake which I'm sad to say I HAVE made...more than once in my nearly 50 years wrenching. LOL

I've never replaced one in a PT, but in most cars, the pointy bit goes up. Not sure the PT even has a pointy bit...OR if it goes up if it does, but it can make them act like they are stuck open.

Second, did you take care to bleed all the air out of the system with the little bleeder valve on the thermostat housing? Not sure how it would eat stats, but who knows?

And lastly, did you find any junk in the stats you took out. Like maybe there is scale that was loosened up by the flushing, circulating around in the system and hanging it open? If so...well you know the drill. Drain flush with clean water and repeat till clean. ;~)

Those would be my first thoughts.

OH...and make sure about the radiator cap. As a matter of fact, if you still have the old one, put it back on an try it. It IS possible to get a bad cap. I've also had that happen...TWICE! ;~0

Agree.
I replied to the other identical thread with those thoughts.
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Old 03 Jun 2014, 12:27 pm
JDB JDB is offline
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Default Re: eating thermostats

Quote:
Originally Posted by quicksilverdon View Post
Agree.
I replied to the other identical thread with those thoughts.
LOL...great minds think alike brother! ;~)
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