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WEEBEDNA
Dodge Dakota
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7/28/2001
19:12:59

Subject: 4.7 Thermostat Install
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I got the Robertshaw 180 from speedtweaks along w/the DEI Radiator Relief. I have 2 questions after installing:

1. Do I need to reset the pcm after changing the thermostat (195 to 180) because my temp gauge still appears to be at the same spot?

2. The manual recommends adding fluid to the overflow tank...not by opening the pressure cap and adding there.
After loosing so much fluid from the change, I would think there would be a lot of air in the system. Do I need to somehow bleed the air out (from the Coolant bleed valve), or will the air escape out of the system on its own....



surferpug
Dodge Dakota
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7/28/2001
19:23:45

RE: 4.7 Thermostat Install
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I belive the air will escape being replaced by the fluid in the overfill tank, so just keep checking the overfill tank and keep filling it until you notice no more liquid is lost. I don't think the temp guage will read the change of 15 degrees



surferpug
Dodge Dakota
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7/28/2001
19:24:57

RE: 4.7 Thermostat Install
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My temp guage is in Celsius so I notice very little change



mikew
Dodge Dakota


7/28/2001
21:06:23

RE: 4.7 Thermostat Install
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I don't think changing to a 180 thermostat will make the engine run cooler. The 4.7L Fan clutch engages at (195 to 205) so the rad fluid is going to heat up to this point. This may explain why your temp gauge doesn't read cooler with the new thermostat. Also, on the 4.7L engine the thermostat is designed to block the flow of the coolant bypass journal by 50% instead of completely blocking it.



WEEBEDNA
Dodge Dakota
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7/29/2001
09:45:15

RE: 4.7 Thermostat Install
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I'm wondering why so many change to a 180 thermostat then if the fan clutch doesn't engage until 195. If it doesn't make the engine run any cooler then why bother?

When I pulled the stock 195 thermostat and compared it to the RobertShaw 180, I started to put the 195 back in because it appears to be built much better and more heavy duty.



Craig
Dodge Dakota
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7/29/2001
11:02:15

RE: 4.7 Thermostat Install
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I have a 2000 4.7L and when I installed the 180 Stat I immediately noticed my engine running cooler. The gauge registered lower immediately. If you drained coolant you should top off radiator. It is easy to open bleed screw it is just to the left and back of the radiator cap. If after getting your coolant up to proper level and you still don't notice the gauge reading lower then I would suspect that maybe you didn't get a 180 stat. Btw...as far as temps go I live in South Florida where it is hot year round!

Regards,

Craig



MAD DUC
Gen III
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7/29/2001
11:45:47

RE: 4.7 Thermostat Install
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I know that it made a major difference on my 2001 4.7. I put in an Auto-Meter pro comp gauge and before with the stock tstat it ran 200-215. Then after the RobertShaw tstat and Radiator Relief it runs 180-190 all the time! Hot and humid days even with the AC on. My stock gauge(if you want to call it a gauge) also reads lower. As far as quality goes, I find nothing lacking with the Robert Shaw unit in any way. Would like to see if this tstat will work in the wifes new Jeep Liberty with the 3.7.Bernd???



konfushus
Dodge Dakota
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7/29/2001
12:16:21

RE: 4.7 Thermostat Install
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After installing my 180 T-stat, I had to bleed the coolant afterwards too. I made the mistake of not bleeding the coolant after re-filling the radiator.

This caused the engine to run *H-O-T* You'll find that there's little to no coolant if you don't open the coolant bleed valve. Use a hex wrench to lightly unscrew it. You don't even have to take the whole screw out.

On my stock temperature guage, the temperature is reading much lower than with the stock T-stat. I estimate it reading out to be 180.

-j-



WEEBEDNA
Dodge Dakota
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7/29/2001
15:31:18

RE: 4.7 Thermostat Install
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removing the trapped air via the bleed valve did the trick....noticable difference in the temp gauge...

thanks...



Horbedarn
Gen I
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7/29/2001
22:53:04

RE: 4.7 Thermostat Install
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MAD DUC, where did you put the sending unit for the Auto-Meter pro comp temp gauge?

Thanks

2000, CC, SLT, 4x4, 4.7, 3.55, Auto
Borla Cat-Back, AirRaid Intake, TB Spacer, 3923's, 180 T-Stat
MTX Amped Thunderform

MAD DUC
Gen III
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7/30/2001
00:47:29

RE: 4.7 Thermostat Install
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I took out the bleed screw and put the sending unit in it's place. To bleed the system afterwards just remove the wire from the sending unit and loosen it to bleed the air.



Horbedarn
Gen I
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7/31/2001
22:44:59

RE: 4.7 Thermostat Install
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MAD DUC, how accurate of a reading does your gauge give you?

Thanks

2000, CC, SLT, 4x4, 4.7, 3.55, Auto
Borla Cat-Back, AirRaid Intake, TB Spacer, 3923's, 180 T-Stat
MTX Amped Thunderform

MAD DUC
Gen III
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8/03/2001
12:44:17

RE: 4.7 Thermostat Install
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Not sure what you are looking for by "how accurate", but does seem to give excellant readings. Registers a difference when I floor it for awhile, then comes back down to "normal", or on extremly hot and humid days with the A/C on temp is higher but never like it was before I put in the t-stat and radiator relief. The highest reading I have gotten so far is about 200 degrees, on a day with the 'heat index' outside of 105, a/c on and the whole family in the truck with me also in city traffic! Auto-Meter do make quality gauges so I trust it is accurate.



T.Fox
Dodge Dakota
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1/29/2003
23:16:56

RE: 4.7 Thermostat Install
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I just installed a "Jet" 180 T-Stat along with a Jet stage II chip, K&N FIPK 2, a cat-back exhaust and the 3923 plugs.

I drove around for a little while and the temp got very hot. Do I need to bleed the system, if so how do you that (engine on/off, how long do you open the valve etc.) It the T-stat possibly defective. Someone help...please



Texas Todd
Dodge Dakota
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1/30/2003
12:42:46

RE: 4.7 Thermostat Install
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Did you put the pointy end the correct way on the t-stat, actually, I think it really only goes in one way. Run the engine, idling, and leave the cap off, as the t-stat opens, it will show low if it is low, and add water, or water and coolant to top it off. There is a bleeder, it's a hex head right up there by the cap, but I don't think you need it.



Texas Todd
Dodge Dakota
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1/31/2003
09:54:43

RE: 4.7 Thermostat Install
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mikew,

HELLO, do you have any idea about anything you're talking about?

With my 4.7, 180t-stat installed, I've, like others, have completely removed my belt clutch/fan! It's been two years now, in the Houston/Galveston, highway/city, etc. Gauge never even ever gets to 1/2 over.

If you want to know about this, do a search here on this site.

Doesn't make the engine run cooler? Then why don't you just put in a 290-if they made one. You don't EVEN understand how this, or any for that matter system works if you think under any circumstances, the engine HAS to get to the temp to engage the clutch fan fully, and in the case on the 4.7, the stock electric fan as well.



idiot
Dodge Dakota
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8/17/2003
16:14:10

RE: 4.7 Thermostat Install
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So with Todds logic, if you dont put a t-stat in at all...itll run 100 degrees right Todd?

The thermostat is just part of the cooling system. A 180 stat wont do crap if your radiator only holds 2 cups of water.

In some cases a cooler stat will speed the flow of coolant to the point that the radiator doesnt have time to cool it.

Open your mind Todd.

Bump



TexasTodd
Dodge Dakota
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8/17/2003
22:50:43

RE: 4.7 Thermostat Install
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Mr idiot,

(you used that screen name)

I"m not sure why you dug this up out of the archives, had some time on your hands did you? Good.

I agree, in that taking out the thermostat altogether, doesn't always make it run cooler. the fluid may not have enough time to dissipate the heat before it goes thru again.

When I installed a 180 stat, the gauge at operating temp, is lower, than with the stock t-stat.

Todd



TECH
Dodge Dakota
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8/17/2003
22:54:22

RE: 4.7 Thermostat Install
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It would take a significant amount of "stopped" time to make the entire cooling system get over 190 if you have a 180 stat installed. When you are moving, the radiator is getting cooled constantly, so yes, the engine will run cooler, UNLESS you have no airflow, or very little, across the radiator. The engine fan pulls a little air all the time, and if the ac is on, the 4.7's electric fan will do the trick.
The coolant rate of flow from a 190 to a 180 is minimal, and shouldn't cause any efficiency problems. Removing the stat completely MAY cause the coolant to flow too quickly through the radiator to be cooled, but a 180 shouldn't.
On systems with bleeder screws, to properly fill the system, you need to crack the bleeder to let air out. Fill the system with coolant, and as the coolant flows into the cooling system, it'll push out the air at the bleeder screw. When you got coolant flowing out of the bleeder, then tighten it down and check the level. As you run the engine, any air that is left in the system will move into the expansion tank, and the coolant level will have gone down a little in proportion to the amount of air that was purged from the system.
If you don't crack the bleeder, coolant can't flow in as you fill it.



Gene Sanders
Dodge Dakota
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6/19/2004
11:41:14

RE: 4.7 Thermostat Install
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Is there any way to adjust the temp reading of fan clutch 195-205 to match lower reading of new 180 thermostat? Engine light on 2003 4.7 keeps coming on with P0128 (too cold) code???
gene51ws@comcast.net



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