Dex-cool yes-or-no? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


General GM Chat When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made. Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-06-2007, 10:39 PM   #11
Senior Member
Posts like a Camaro
 
Join Date: Dec 2003
Location: Massachusetts
Posts: 1,019
Thanks: 0
Thanked 0 Times in 0 Posts
CFoote is on a distinguished road
Default

Jim, that'* interesting that you say that. I'm about ready to flush my system and am still debating in my mind what to do about my aluminum 3.5....to dex or not to dex??? I am running this car into the ground so it needs to last.

Do the Northstar engines come with aluminum gaskets from the factory? The only leak I've had on my 3.5 is the valve cover gasket, the original Dex from July 2001 (when the car was built) is still in there. It'* getting grimey and needs to get changed.

Chris
CFoote is offline   Reply With Quote
Old 08-07-2007, 02:05 AM   #12
Senior Member
Certified GM nut
 
Join Date: May 2005
Location: Wickliffe, Ohio
Posts: 2,155
Thanks: 0
Thanked 0 Times in 0 Posts
McGrath is on a distinguished road
Default

I'm going to agree with everyone else and say no to the Dex cool. Just flush it out with a compatible coolant.

If you take a look in my thread in Performance & Brainstorming you'll see the LIM gaskets from my L32 with 35k on it. The Dex we eating those gaskets up, not quite as bad as the pictures above though.

Ed
McGrath is offline   Reply With Quote
Old 08-07-2007, 01:36 PM   #13
Senior Member
Posts like a 4 Banger
 
Join Date: Apr 2004
Location: Lakewood, WA 98499
Posts: 128
Thanks: 0
Thanked 0 Times in 0 Posts
armyguy2us is on a distinguished road
Default re

Funny, i have been running the original dex cool in mine. Never had to add any coolant other than when I changed the thermostat and it isn't that grimy yet. Figure when I get out of happy land (iraq) I'll do a change on it. Not sure what to go with though. Haven't decided. Probably prestone LL.

cliff
armyguy2us is offline   Reply With Quote
Old 08-07-2007, 05:16 PM   #14
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Quote:
Originally Posted by McGrath
I'm going to agree with everyone else and say no to the Dex cool. Just flush it out with a compatible coolant.

If you take a look in my thread in Performance & Brainstorming you'll see the LIM gaskets from my L32 with 35k on it. The Dex we eating those gaskets up, not quite as bad as the pictures above though.

Ed
I couldn't agree with you more, Ed. Every gasket I've ever pulled out of a non-dex engine has looked great at 100k. But a VERY high percentage of dex-soaked gaskets look absolutely rotten. The gaskets are made the same, which leaves DEX as the culprit.

I will NOT blame this on the gaskets themselves. They were designed for green, and perform flawlessly. But as DEX ages, it becomes acidic, and breaks down the plastic. Changing the gaskets to aluminum is a bandaid. Not a bad one, but the original problem isn't fixed.
willwren is offline   Reply With Quote
Old 08-07-2007, 05:21 PM   #15
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Actually after a quick conversation the other day with Lash..it may not be the same gasket material. The composition on most items used for the Dex switch over changed to something that was designed to work with it. The gasket material composition may be different than that of the prior.
BillBoost37 is offline   Reply With Quote
Old 08-07-2007, 05:30 PM   #16
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

The gaskets that came off my car in 2005 and the ones that went on were very different... The 2nd GM design had the crush washers and the ports looked to have a rubber surround as oppose to being 100% full on plastic... I still have the gaskets I pulled off the car for the Ported Lower intake... They still look like brand new..

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 08-07-2007, 05:38 PM   #17
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

I have both types of gaskets at home. Every inspection method I have has shown them to be identical material.

And why does the 95 L36 use the same gaskets, but it never had the DEX? Wouldn't we assume a different part number?

There'* alot of unanswered questions.

Why do the Pre-Dex gaskets always look MUCH better? Questions, questions, questions.
willwren is offline   Reply With Quote
Old 08-07-2007, 07:11 PM   #18
Senior Member
True Car Nut
 
Join Date: Feb 2003
Posts: 3,684
Thanks: 0
Thanked 0 Times in 0 Posts
smellbird is on a distinguished road
Default

Quote:
Originally Posted by willwren
And why does the 95 L36 use the same gaskets, but it never had the DEX?
I disagree. My 95 SE had Dex in it and it was a fleet vehicle, I highly doubt it had been changed to Dex from green stuff.
What is the problem, the Dex or the gasket material? In my opinion it'* both of them.
It'* not right that the coolant is eating away at the gasket, but in reverse what kind of crap material are the gaskets made of that get eroded?
This is one of those topics that will never have any sort of clear cut answer and will always be a source of contention.
smellbird is offline   Reply With Quote
Old 08-08-2007, 03:04 AM   #19
Senior Member
Posts like a Camaro
 
Join Date: Jan 2003
Location: Jenison, MI (Near Grand Rapids)
Posts: 1,070
Thanks: 0
Thanked 0 Times in 0 Posts
theJMFC is on a distinguished road
Default

Quote:
Originally Posted by smellbird
Quote:
Originally Posted by willwren
And why does the 95 L36 use the same gaskets, but it never had the DEX?
I disagree. My 95 SE had Dex in it and it was a fleet vehicle, I highly doubt it had been changed to Dex from green stuff.
Wasn't Dex first tested in fleet vehicles before the entire line got it? That might explain why this '95 had it.
theJMFC is offline   Reply With Quote
Old 08-08-2007, 08:37 AM   #20
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

There'* no logic in Dex eating through a rubber seal and eroding the plastic inside the air/fuel intake ports in most cases.

In talking further with my mechanic buddy, who spent 10 or so years at a Pontiac/Caddy dealer. He says the problem is not the dex. It is heat related, and this explains why some of us running SC'* and having a hotter air charge would have the collapse. Look at the design for what it is.. there are structural deficencies built into the cooling ports. Dead center of every flat area they put a dimpled spot. Call it X marks the spot for cracking.

You have a solid plastic frame with a rubber section and then plastic inside of that. No supporting structrue for the inside piece of plastic. Poor design.

Most other motors don't have gasket failure because they contain dex. The 3.4 and 3.1 is a poor excuse for a design.

95 L36'* also suffer the same issues....Dex or not..the gaskets are failing. What we are failing to take into account is that when we are replacing the Dex with green... we are usually changing the T stat and lowering operating temperature at the same time. We change two variables and then don't account for one?
BillBoost37 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Yes, Yes, YES!!! MOS95B Lounge 21 01-10-2007 04:39 PM
YES YES YES BigChuck94 General GM Chat 17 03-24-2006 10:53 PM
Investigation of Dex-Cool; potential class-action lawsuit big_news_1 General GM Chat 7 03-03-2006 08:37 AM
GM Dex-cool 99_Bonney_SLE 1992-1999 12 02-02-2006 03:37 PM
Dex-Cool...Good, Bad, or Ugly Mario Rosso 1992-1999 12 02-16-2003 04:18 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:31 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.