#21  
Old 10-17-2019, 01:53 PM
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You've maybe already done this, but run the engine for a little while with the radiator cap off to see if coolant is circulating normally.

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Old 10-17-2019, 02:48 PM
1966geeto 1966geeto is offline
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Originally Posted by ta man View Post
Where is your sender located?
Was next to t stat moved to lt cyl head just to make sure was reading correct .

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Old 10-17-2019, 05:00 PM
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Remove the t-stat and run it to see if it is the issue

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Old 10-20-2019, 03:57 PM
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Originally Posted by 70GS455 View Post
Remove the t-stat and run it to see if it is the issue

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So I finally had some time t get back after it I pulled the manifold and checked the crossover and bypass holes all good,. Reassembled and left out t stat radiator looked like Niagara Falls great flow and temp had a hard time reaching 180 even idling . I am stumped .

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Old 10-20-2019, 03:59 PM
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Originally Posted by 455HOGT37 View Post
As mentioned earlier, replace the thermostat with a gutted unit as an easy way to rule out that issue. It's a few minutes of work.
Ran without t stat no issues I just can't see 2 of them being bad ? Had a hard time reaching 180 degrees !

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Old 10-20-2019, 04:40 PM
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Quote:
Originally Posted by 1966geeto View Post
Ran without t stat no issues I just can't see 2 of them being bad ? Had a hard time reaching 180 degrees !
Are both the same brand? Maybe you want to change brands? Stant perhaps?

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Old 10-20-2019, 06:34 PM
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Quote:
Originally Posted by FrankieT/A View Post
Are both the same brand? Maybe you want to change brands? Stant perhaps?
Napa premium !

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Old 10-20-2019, 06:40 PM
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Originally Posted by 1966geeto View Post
Ran without t stat no issues I just can't see 2 of them being bad ? Had a hard time reaching 180 degrees !
Throw them in a pot of water and put it on the kitchen stove, along with a cooking thermometer, to see if they open at the correct temperature.

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Old 10-21-2019, 08:06 AM
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If they are the same brand ... could have been a bad batch, or a bad design.

Yeah ... I'd be curious enough to test one of them. Could be they made a batch with a sticky valve ... or bad paraffin cans.

If they are different brands ... yes, it would very strange to have two bad ones in a row .... (assuming they aren't the same manufacturer with different labels).

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Old 10-21-2019, 11:45 AM
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I only use the stant super stats, the spring type, they seem to respond the best and flow great.

It sounds like bad stats to me. I would rule that out before anything else. Yes, on having X number of them bad in a row.

Have you retorqued the heads after initial fire up? What kind of head gaskets?


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Old 10-21-2019, 12:38 PM
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You know ... this thread reminds me .... on final sorting before startup ... it's probably a good idea to pre-test any t-stat I plan on installing ... might save having to pull it apart and change it later.

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Old 10-29-2019, 10:52 PM
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We've had three out of four bad ones - and that was different manufacturers being tried. One that finally worked was the cheapest. Go figure.

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  #33  
Old 10-30-2019, 02:45 PM
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Try a Stant Super stat.

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Old 10-30-2019, 03:27 PM
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Whatever you do, test the unit on the stove before it goes in the car!

  #35  
Old 10-30-2019, 04:12 PM
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Default super stat

The Super stat is a quality piece. mine opened at 177ish and wide open by 187ish. Heck on days below 70 my car runs down the road just below 180. Only on hotter days does she run at 185max. Gerry

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  #36  
Old 10-31-2019, 12:20 PM
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So ... was the OP's problem fixed?

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