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#992111 - 09/18/07 09:42 PM anyone else experience FAULTY New Thermostats?
meep Offline


Registered: 02/20/07
Posts: 2514
Loc: Southeast
Just replaced the 190* t-stat in my 93 JGC with 229,000 miles. Old one opened at the right temp, but not all the way. So, while repairing a gasket leak, I opted to buy the stant part w/ 1 yr warranty (the least-cost stat, as opposed to lifetime warranty).

Once replaced, engine temp quickly rises to ~195, then slams down to 170. Then up to 195, slams down to 170. All day long.

Now, the h20 pump was leaking, so I just had it replaced. The new pump has slightly changed things... Does this now:

- warm afternoon: engine temp quickly rises to ~195, then slams down to 170. 195, 170, up to 200, stays put.

- chilly morning: engine temp quickly rises to ~195, then slams down to 170. 200, 170, up to 210... and keeps bouncing.

It cycles 2-3 times/minute.

Clues?
1. I suspect that there was air left in the system after pump replacement as the reservoir has dropped some.
2. No bubbles in the reservoir during hot idle, hot revving.
3. no oil or oil spoo in the coolant
4. no coolant in the oil
5. twice I've found where coolant has burped out of the reservoir cap. not sure why, it's only 1/2 full.

Anyone else seen this?

Mike
_________________________
2006 Tundra 2wd
2002 MDX (wifey!)
2003 town and country, in various state of repair

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#992112 - 09/18/07 09:49 PM Re: anyone else experience FAULTY New Thermostats? [Re: meep]
Quest Offline


Registered: 12/19/04
Posts: 6472
Loc: beaver land EH?
1. yes, possibly
2.doesn't matter. Refer to 1.
3. it just means that your oil and coolant are happily staying separated.
4.again, Refer to 3.
5. purge your cooling system to rid of any trapped air pockets.

2 things I can think of (a) have you perform any chemical flush to your cooling system? (2)did you install your thermostat in the proper orientation? (barrel side towards the block, pointy side towards the rad)?
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#992113 - 09/18/07 10:00 PM Re: anyone else experience FAULTY New Thermostats? [Re: Quest]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
With Stant, all the time. They'll either fail new, or within a couple of months later. I've never had a stant last more then a year. And, after having dozens cause issues, Stant 'Economy' is one brand I avoid.

For thermostats, stick with OEM if possible.

Make sure you understand how to burp the JGC.

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#992114 - 09/18/07 10:14 PM Re: anyone else experience FAULTY New Thermostats? [Re: unDummy]
meep Offline


Registered: 02/20/07
Posts: 2514
Loc: Southeast
Quest: thanks for the thoughts. I mention 2 3 and 4 because they would suggest a head leak, which would also cause "1" continuously. by now, 5 should be covered.

No chemical flush. In my experience they remove too much, or too little. :-(

Orientation. absolutely. it only fits one way anyway, but yes that would definently cause..

unD.: AHA! yep. I went with stant "economy." a friend just installed the upper level stant only to find it's 30* off. Advanced Auto only stocks Stant. I've heard that Murray also blows chow. Suggested brands? We have NAPA, Advanced Auto, Orielly's (murray) and Autozone here.

mikey!
_________________________
2006 Tundra 2wd
2002 MDX (wifey!)
2003 town and country, in various state of repair

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#992115 - 09/18/07 10:41 PM Re: anyone else experience FAULTY New Thermostats? [Re: unDummy]
Tempest Offline


Registered: 03/21/06
Posts: 10468
Loc: Las Vegas NV
Quote:

Stant 'Economy' is one brand I avoid.



What is your experiance with the "Superstant" models? I put one in my truck about a year ago and so far so good.
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#992116 - 09/18/07 11:05 PM Re: anyone else experience FAULTY New Thermostats? [Re: meep]
Merkava_4 Offline


Registered: 01/30/07
Posts: 9558
Loc: Clovis, CA
I only get the thermostats from NAPA or the dealer, and I always buy the best one they have; I don't trust any of the others.

I don't use the air bleeder screw on mine; I just back the radiator cap off one click and bleed it out that way. When you see big gulps of air coming out the reservoir, you'll know it bleeding good.

When the water starts to boil inside the reservoir, it's time to tighten your radiator cap to its final click.

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#992117 - 09/18/07 11:18 PM Re: anyone else experience FAULTY New Thermostats? [Re: Merkava_4]
meep Offline


Registered: 02/20/07
Posts: 2514
Loc: Southeast
Online, NAPA's primary brand is Stant, and the stant "superstat" name. also a "racing only" brand - - um, mr gasket, maybe?

mike
_________________________
2006 Tundra 2wd
2002 MDX (wifey!)
2003 town and country, in various state of repair

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#992118 - 09/18/07 11:23 PM Re: anyone else experience FAULTY New Thermostats? [Re: meep]
Merkava_4 Offline


Registered: 01/30/07
Posts: 9558
Loc: Clovis, CA
If NAPA's best most expensive thermostat is a Stant Superstat, then fine; get that and save your receipt. Get the factory temp too!

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#992119 - 09/19/07 12:04 AM Re: anyone else experience FAULTY New Thermostats? [Re: Merkava_4]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
Yep, finding brand name parts is tough.
Visit the dealer and overpay for OE parts.
MrGasket, Prestone,....might be worth trying to locate. Even if not in stock, most of your autopart stores can order by brand/PN.
The robertshaw and cooperstandard thermostats are tough to find at ANY autoparts stores. Try the flowcooler.com website. 330 or 333 should be the size. I would probably use a 180 or 195 depending on driving style---investigate PNs 330-180, 330-195, 333-180, 333-192

BTW, once you know the size of your thermostat, you can research other 'makes & models' that use it. This means you could also get OE parts from the local Ford, Toyota, GM or..... if you know the year/make/model/.... So, you have other choices at various domestic speed/4x4 shops.

Superstant/Delco/Gates/Napa clones are definitely a better 'risk' then the economy choices. By all means, get the superstant over the economy any day.
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#992120 - 09/19/07 01:36 AM Re: anyone else experience FAULTY New Thermostats? [Re: unDummy]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
Cheap thermostats can be erratic, for sure.
Bite the bullet and get a factory [expensive one].

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#992121 - 09/19/07 02:37 AM Re: anyone else experience FAULTY New Thermostats? [Re: mechtech2]
Fester Offline


Registered: 03/06/07
Posts: 489
Loc: your house

Just Go to AA and asked them to bring out the cheap thermostat and the expensive one, you will see quite a difference in the mechanism, the cheap stat would spike because it hung up, this was on my 4L Jeep Cherokee.

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#992122 - 09/19/07 03:13 AM Re: anyone else experience FAULTY New Thermostats? [Re: meep]
Mudcat Offline


Registered: 04/29/07
Posts: 91
Loc: Dixie
First, my comments assume that your posted temperature readings are from the dashboard instrumentation.

I think before you make any more changes, it would be valuable to hook your vehicle to an ODBI engine scanner. On some vehicles, the dashboard temperature indication is separate from the temperature sensor going to the vehicle's control module. I have first hand knowledge of this possibility having needlessly performed a thermostat-ectomy. Also, some temperature sensors are single wire affairs that rely on a ground to the engine to complete the circuit. A fluctuating ground may cause some bizarre readings.

However, you might actually have entrained air or a poorly performing thermostat or a combination of both. If you are able to confirm it is the thermostat, Iíll second the suggestion to go back to an OEM if itís available or if not a Stant Superstat from NAPA.

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#992123 - 09/19/07 06:41 AM Re: anyone else experience FAULTY New Thermostats? [Re: Mudcat]
Chris142 Offline


Registered: 06/05/03
Posts: 11591
Loc: apple valley, ca
Superstats are fine. The less expensive Stants are trouble. Put a cheapee in my jeep last summer and it stuck closed 3 days later.
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#992124 - 09/19/07 11:11 AM Re: anyone else experience FAULTY New Thermostats? [Re: Chris142]
AcuraTech Offline


Registered: 05/11/04
Posts: 1561
Loc: St. Paul, MN
Aftermarket Thermostats = Junk

Thermostat is one of the most important components in modern computer calibrated vehicles! OEM is generally better because it usually has a heavier spring and a better build.
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*The above post is not to be construed as professional advice. For entertainment purposes only.*


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#992125 - 09/19/07 05:07 PM Re: anyone else experience FAULTY New Thermostats? [Re: AcuraTech]
porcupine73 Offline


Registered: 10/06/05
Posts: 664
Loc: Buffalo, NY
I ran a stant for a few years in '96 Subaru without any problems, but when you compare it with the OEM thermostat you can see a big difference:

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