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Don Curley
Dodge Dakota
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5/02/2012
14:46:42
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 Subject: Switching to a 180º Thermostat in a 5.9?
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I've got a swapped-in Dodge Magnum 5.9L V8 engine in my 2000 Jeep Wrangler TJ and I am about to do the plenum plate upgrade to my factory intake manifold.
While I am doing this work, I plan to replace the thermostat. I could of course just go with the same 195º thermostat that the factory used for this engine, but I have previously heard that a lot of guys have gone with a 180º unit.
I would also like to go with a 180º thermostat, however, I want to make sure that I am not going to get into any unintended consequences from a performance perspective by doing this. For example, if the PCM is looking for the engine to come up to operating temperature, I don't want to get into any potential fuel mixture or advance curve issues with the PCM wrongly interpreting the lower engine operating temp as an indication that the engine hasn't fully warmed up yet.
So, if anyone with either a 5.2L or 5.9L has switched to a 180º thermostat, or is otherwise knowledgeable about the way the PCM looks at the engine operating temp (as a function of coolant temp), please let me know if you have had any adverse performance problems or whether this move wouldn't be recommended for some reason.
Thanks in advance,
Don
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Todd93/96Dak
Dodge Dakota
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5/02/2012
22:22:34
| RE: Switching to a 180º Thermostat in a 5.9?
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I've been running the 180 thremo. for 2.5 yrs in my 96 Dak. And I'm running a built 5.9 also. truck runs a little more rich when cold, but not a big deal. I do have s light problem during winter getting sufficient heat though. It doesn't blow hot, but I get enough warmth out of it.
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Don Curley
Dodge Dakota
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5/03/2012
10:01:59
| RE: Switching to a 180º Thermostat in a 5.9?
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Here's a comprehensive write-up on the subject on Dodge Forum ... http://dodgeforum.com/forum/2nd-gen-ram/311063-180-thermostats-pros-and-cons.html
I also received a response from a Dodge service tech on another board I posted to who basically gave a shorter version of the same information that was in the Dodge Forum write-up.
So, since I don't have a tuner/programmer, I am definitely going to stay with a 195º thermostat as I don't need to get even worse fuel mileage.
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Fred
Dodge Dakota
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5/03/2012
10:07:57
| RE: Switching to a 180º Thermostat in a 5.9?
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I put in a 160 degree years ago and I have to say that its probably too cold. In the winter time the heat barely keeps me warm inside the cab
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