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Heating & Cooling 4th Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 06-09-2014, 12:57 AM
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USAF Long USAF Long is offline
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Default 180 Degree Thermostat Review

I installed the t-stat last night, took all of about 10 minutes and two 13mm bolts to remove the water neck. I left the upper hose attached. A good amount of coolant drains out so have a catch pan. The t-stat pops out, the new one goes in, and you replace and tighten the two bolts. I topped off the radiator with water since its summer time. I started the truck and turned the heat on high, let it warm up in the driveway. It got no hotter than 181 degrees sitting in my driveway.

Took it for a cruise down the highway and it stayed about 186 degrees at 70 mph cruising speed. Before the truck would run between 205-210 degrees with the stock t-stat. My trans temp stayed in the 120's. Oil temp was just barely over 200 I think it was staying at 201 degrees.

An easy part to replace to keep your truck running cooler and help your trans live longer with cooler trans temps since the radiator also works inline with the tranny cooler.

Truck seems to not lose its off the line power like it did with the stock t-stat when it would get hot. I plan to add a tuner soon and hope the cooler temps will allow me to add more timing for more power.
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  #2  
Old 06-09-2014, 03:19 PM
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Everything under the hood will thank you. I've run 180F thermostats in my 2 hemis for about 500,000 miles, total. Only thing I've replaced: fluids and spark plugs.
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Old 06-09-2014, 04:41 PM
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I know on other forums people say not to change it because if it was better Chrysler would have put them in from the factory. Well my truck is not staying stock so I want it to perform the best.
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Old 06-20-2014, 02:07 PM
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I think the truck should give better MPG running the higher temp, I did say should not will.
It may also be a Gov. thing for better Burn and Less "BAD" things coming out of the tail pipe. LOL
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Old 06-20-2014, 02:20 PM
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I just towed my 27' boat this past weekend up to Bear Lake which has a lot of mountain grades and for most of the time the truck stayed at 188 degrees, 220's oil temp, and 150's trans temps. Going up the mountains it would get about 215 but as soon as it leveled out the temps would drop back to 186-188.

I like that it keeps the engine substantially cooler. My boat weighs 6600 lbs dry, trailer is 2500 lbs, we had about 80 gallons of fuel in the boat too plus food and coolers and generator. It pulls great for being above or near max tow rating.
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Last edited by USAF Long; 06-20-2014 at 02:26 PM.
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Old 06-20-2014, 02:36 PM
TJC.geotech TJC.geotech is offline
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Water boils at 212F... that's why they put 200 deg thermostats in everything. Moisture in the crankcase is a big bye product of any gas motor, and will cause white milky sludge buildup in areas where oil settles, like your cylinder heads and lifter valley. It's just not a great idea on something you drive all the time.
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Old 06-20-2014, 02:57 PM
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Well my oil temps get over 212 when I'm towing so that will burn off any moisture. When you mix water and antifreeze, the boiling point is higher otherwise you will boil all the water out of your cooling system and kill your engine. Also, having the cooling system pressurized raises the boiling point as well. I know some guys who run water in their cars in the summer but if the radiator cap fails to keep pressure, they are screwed.
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Old 06-20-2014, 05:08 PM
TJC.geotech TJC.geotech is offline
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Quote:
Originally Posted by USAF Long View Post
Well my oil temps get over 212 when I'm towing so that will burn off any moisture. When you mix water and antifreeze, the boiling point is higher otherwise you will boil all the water out of your cooling system and kill your engine. Also, having the cooling system pressurized raises the boiling point as well. I know some guys who run water in their cars in the summer but if the radiator cap fails to keep pressure, they are screwed.
We used to have Honda gensets destroy themselves in very cold climates, when they made a milkshake of the oil and pushed it past the rings and out the crankcase seals. Did not take very long either. A severe example, I know.

Toyota had major oil sludge problems a few years ago because the engines built so little heat during normal use. Caused lots of warranty work.
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Old 06-20-2014, 06:58 PM
wiflash71 wiflash71 is offline
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So is that the thing with these Hemi's they need the 200 degree T-stat for optimal operating efficiency? Anyone with 180 degree T-stat see any negative effects on gas mileage?
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