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Old 07-13-2007, 09:27 PM   #1 (permalink)
Dave12
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180 degree T-Stats.....Pros and Cons

What are the pros and cons of running 180 degree thermostats vs. 195 degree?

Would this be a good option for keeping coolant temps down while towing? Will there be a downside when not towing?

Thanks,
Dave

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Old 07-14-2007, 08:37 AM   #2 (permalink)
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I have a 180 Robert Shaw sitting on the shelf in my garage. I had to swap in a stock 195 to set the timing last fall and never swapped the 180 back in again.

So one disadvantage of the 180 is that it's hard to reach the operating temp required by the time setting functions.

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Old 07-14-2007, 08:53 AM   #3 (permalink)
schiker
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180 pro's

Lower under hood temp - benefits the FSD/PMD if under the hood and all the other underhood plastics/rubber and various components.

Cons

Lower engine temperature. Diesels like a warmer block; it makes the engine more effiecient to run at 195 as long as intake air charge is the same (cool as when engine is at 180).

-------------------------------------

Thermostats temp should not cause or solve an overheating problem (if they are working correctly). But may reduce temp swings that will engage the fan. I run (2) 180F thermostats and my truck usually runs about the 180-185 (dang GM odd ball tick mark on gauge is hard to remember exact number) and rarely moves normal driving. When towing it fluctuates according to load. It can go up ~10-20 degrees also depends on if A/C is on. That shifts the pivotal operating temp a little higher.

Now if they were 195F and you add 20F the fan might start to engage and take more power from the crankshaft (guesstimate 10-20 HP). I think the AC compressor robs about 6 hp and I can feel that engage so I don't want up to 3 times that taken away when I am working the engine hard.

----------------------------------
I don't know but I feel like there is a reasonably significant difference in a 20F swing across 212F. I know ECT is only one measure other areas are hotter and cooler but something still bothers me about too much moisture steaming as I think steam can super heat differently than water. I have no science to back that up as to how or where this moisture can act but something I think is different there.
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Old 07-14-2007, 09:15 AM   #4 (permalink)
schiker
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OK I know it can get hot up north too but for how long. Down here depending on where you are at it doesn't cool off until 10PM and seems like never sometimes.

Once when I had a stuck open thermostat did I have a problem getting over 160F ECT within the time limit and set an SES light but even in dead of winter (ha not so cold or long here) with 180F I have heat pretty quick and no problem holding ~180F.
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Old 07-14-2007, 11:01 AM   #5 (permalink)
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Our montana friend has a feature article on his web site that take all the mystery out of what works for cooling.He found the 195's pushed the temp over 212+ before they were fully open. He recommends & uses the RS 180's. Now with the new screw on marine pump & duramax fan clutch & duramax fan blade the temperature swing problem is a past issue. Do you guys know the Duramax radiator is the same size dimensionally as the stock6.5 radiator ? It is!!! Stop the wide temperature swings ,stop the block cracks,I say!!!
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Old 07-14-2007, 12:33 PM   #6 (permalink)
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180's and cold weather?

Can't help with a pro or con comment however I recently upgraded my fan and clutch and it was recommend by the vender that 180 F thermostats be used with this new setup. I've had the fan in for a couple of weeks, but I just installed thermostats today. I'm in Ontario, warm summers, cold winters, do people with trucks in the north run the 180's all year, or do you have to change them out as the weather gets cold ? My truck had good fast heat in the winter with the 195's. Thanks
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Old 07-14-2007, 01:07 PM   #7 (permalink)
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I saw that on the SS website yesterday when I was checking the price of the 180* stats. It sounds like you might be the guinnea pig for the 180 stats Are you planning on towing anytime soon? I'd be very interested to see if you notice a difference.

My truck heats up nice and quick in the winter also. With some of the stuff I've read about the 180 stats, it has me a little worried about winter temps. I don't use a winter front but maybe that would be the solution.

Dave
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Old 07-14-2007, 01:20 PM   #8 (permalink)
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Quote:
Originally Posted by 4doorTAHOE6.5TD;1878730;
Our montana friend has a feature article on his web site that take all the mystery out of what works for cooling.He found the 195's pushed the temp over 212+ before they were fully open. He recommends & uses the RS 180's. Now with the new screw on marine pump & duramax fan clutch & duramax fan blade the temperature swing problem is a past issue. Do you guys know the Duramax radiator is the same size dimensionally as the stock6.5 radiator ? It is!!! Stop the wide temperature swings ,stop the block cracks,I say!!!

Are we talking about Heath? I can't find any articles that talk about 180* stats. Can you point me to the article you're talking about.

Thanks,

Dave
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Old 07-14-2007, 01:52 PM   #9 (permalink)
Primer
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Even with 195's I can't keep my truck warm in the winter. I've been running 180's for over a year now. The only benefit of 195's in the winter as far as I know would be that the heater blows hotter air. And if you can tell the difference between 180 and 195..your a better man than me

I could be wrong though, so I take no responsibility for this response
Jay
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Old 07-14-2007, 02:16 PM   #10 (permalink)
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Remember that t-stats control the MIN. operating temp. not the max, thats up to the rad and the rest of the sys....

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