Ecodiesel coolant temp

[Vincent Waldon]

Vince, are you absolutely postively 100% sure

100%.  It's the housing that needs to be sealed, not the t-stat itself... now that you've got a Bentley it calls out the assembly sequence pretty plainly... figure 4.8 on page 9 of Chapter 4 "Cooling".

What's the deal with the spring hose clamps?.........  Another PITA!

... and yet brilliantly self-adjusting to expansion and contraction, unlike generic worm-type clamps.

The correct tool makes them really easy... someday I'd love to own one, but in the meantime I usually use a big pair of water pump pliers.  You need to grab 'em in a way that lets you push past the tang.

[92EcoDiesel Jetta]

I like the self tensioning of spring clamps also. I use them on fuel lines where ever I can. It's the tang that's the PITA!  I'm gonna take a Dremel to them and cut that f***in tang off! Any reason I shouldn't do that?

[8v-of-fury]

i think the tang is really only there to prevent over opening of the spring..so as long as you remember there is no tang.. it can only benefit you to cut it off..

[92EcoDiesel Jetta]

I think the tang is there to make you buy their special tool as I don't see how you can over open it unless you make a special tool to do it. If there is a limit to how much these clamps should open, I will start with cutting half of the tang off and see if that's enough.

[92-Eco]

my guage sits on the 4th mark from the right. ive tested all my sensors and fans, etc all works. The fans kick on in low speed at the 3rd mark from the left and ive never had the high speed come on.

[92EcoDiesel Jetta]

100%.  It's the housing that needs to be sealed, not the t-stat itself...

The only concern I'd have, if the T-stat is not sealed to the housing, is that any leaks will in effect bypass the T-stat.

[92EcoDiesel Jetta]

my guage sits on the 4th mark from the right...

So it's sitting on the 1st mark on the left? 

[Vincent Waldon]

You're gonna sandwich it in there tight with the o-ring... it's not going anywhere, and it's not going to bypass into the lower rad hose.

To go even farther, some  t-stats come with an 1/8" bleed hole specifically to let it bypass a little and bled out any air bubbles... earlier in this thread Burn-your-money recommends drilling your own if your t-stat didn't already come with one.

[92EcoDiesel Jetta]

Wouldn't a 1/8" hole in the T-stat slow warn up time and make the engine run colder? Isn't there another way to bleed air?

Vince, How do you do the multiple quotes?

[Vincent Waldon]

Wouldn't a 1/8" hole in the T-stat slow warn up time and make the engine run colder? Isn't there another way to bleed air?

Not appreciably, given what full flow looks like.  Cooling system air generally bleeds out on its own....some folks like a small hole to help it on its way.

Vince, How do you do the multiple quotes?

Cut 'n paste the quote codes that surround the original quote (can't demonstrate, since the software will think it's real code)

[92EcoDiesel Jetta]

I took out the old Wahler T stat,(87 C), tested it in hot water and it did not open after 3 min in boiling water. My new Wahler 92 C T-stat (in the same pot) opened before it boiled. The old stat differs from the new one in that it has a rubber seat on the part of the T stat that moves so its a rubber to metal seal. The new T-stat has no rubber seat so it's a metal to metal seal.  I used a screw driver to push on the old T-stat all around and was able to make it move, un-sticking it (if it was stick), and put in boiling water again but it still would not open. My guess is that it probably does open at a higher temp than 212F? otherwise I would have overheated my engine?

Any theory as to why my T-stat stuck closed? How often does that happen? Could it be from depleted coolant and corrosion that follows? Which happens more often, a T-stat that's stuck closed or stuck open?

[burn_your_money]

Vince, How do you do the multiple quotes?

Hit the "Quote" button above one of Vince's replies where he has multiple quotes and you'll see the magic.

Like Vince said, you won't notice a difference in coolant temps or warm up time with a small hole drilled in your thermostat.

[92-Eco]

Yep, first mark on the left. It climbs when setting at an idle up to the middle mark, then fans kick on but going down the highway or general driving it stays right around that first mark. The cooling fans have only kicked on 1 time since ive had it (2months). I was sitting in the driveway letting it idle to test the guage compared to when the fans kick on. I also wired up 2 little lights (1 comes on at low speed and both come on at high speed) into 1 of the blank buttons on the dash to see when the fans come so i know for sure.

[8v-of-fury]

Your fans only come on once?!? might have a problem or something here.. lmao my fan comes on.. all through out the summer and even during cold days in the winter.. the rads pretty good at holding heat during winter temps up here in Canada..

[92-Eco]

how often does everyone elses fans come on?