Series I 3800 and coolant leak - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Buick When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-29-2010, 03:27 AM   #1
Junior Member
Thread Starter
 
Join Date: Oct 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Leto Atreides II is on a distinguished road
Default Series I 3800 and coolant leak

Hi all, I've got a '95 Buick Regal Custom. So it'* a Series I 3800 / L27. ~62,500 miles. Today my mechanic noticed a leak which he thought was probably coolant around the intake manifold. He commented that it was a common problem with the engine because of the plastic that was used in the intake manifold and that the replacement kit is metal. After doing some checking it seems all I can find is information about the problem with the Series II engines, which matches what the mechanic was saying. I hardly see anything about the problem with Series I engines -- so I'm a bit concerned the mechanic is jumping to a conclusion on the cause, having a Series II engine in mind. Is there a similar problem with the Series I? Is the fix basically the same, new replacement intake manifold kits are aluminum and don't fail as easily? Is around $600-$800 a reasonable cost for parts + labor?

Thanks!
Leto Atreides II is offline   Reply With Quote
Old 10-29-2010, 08:33 AM   #2
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

If the issue is with the plastic upper manifold, then yes..there were some that were metal and can be replaced on it. However the S1'* weren't known for a leak there. Say maybe 1 or 2 out of hundreds that I've read about. The more common issue with coolant on that motor was the heater hose fitting that is screwed into the lower intake. It'* made of a plastic that degrades over time and simply cracks off and such. The replacement pieces are metal. Sometimes it does require the manifold to be removed for this to be done, usually not though.

Pricing is seeming a little high... give him a call and get some better names on what he plans on replacing. There'* not a "kit" that I'm aware of for the S1 motor to swap the plastic upper to metal.
BillBoost37 is offline   Reply With Quote
Old 10-29-2010, 11:36 AM   #3
Senior Member
True Car Nut
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37 View Post
If the issue is with the plastic upper manifold, then yes..there were some that were metal and can be replaced on it. However the S1'* weren't known for a leak there. Say maybe 1 or 2 out of hundreds that I've read about. The more common issue with coolant on that motor was the heater hose fitting that is screwed into the lower intake. It'* made of a plastic that degrades over time and simply cracks off and such. The replacement pieces are metal. Sometimes it does require the manifold to be removed for this to be done, usually not though.

Pricing is seeming a little high... give him a call and get some better names on what he plans on replacing. There'* not a "kit" that I'm aware of for the S1 motor to swap the plastic upper to metal.
Actually its pot metal, though it has the same disastrous effect.

The upper intake plenum also tends to warp and leak right below the throttle body, but I very highly doubt that'* the case at 62k miles. I bought my 95 Regal with 62k miles and I didn't have a single coolant leak.

I would replace that fitting first. Its right above the water pump. The replacement ones are metal, and these are guaranteed to break. No ifs, ands, or buts, it will break and its likely that it has broken on you. Have a look at that and then come back to let us know if that was it or not.
xtremerevolution is offline   Reply With Quote
Old 10-29-2010, 03:09 PM   #4
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

Quote:
Originally Posted by xtremerevolution View Post
Actually its pot metal, though it has the same disastrous effect.
Neat. Didn't realize it was. Had been told it was different and didn't research further.
BillBoost37 is offline   Reply With Quote
Old 10-29-2010, 03:42 PM   #5
Senior Member
True Car Nut
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37 View Post
Neat. Didn't realize it was. Had been told it was different and didn't research further.
Yeah. This car left me stranded 3 times, and this stupid fitting was one of them. When mine cracked, all the coolant sprayed out. The other 2 times were for a bad starter, and then for a bad ground wire that I couldn't find.
xtremerevolution is offline   Reply With Quote
Old 10-30-2010, 12:36 AM   #6
Junior Member
Thread Starter
 
Join Date: Oct 2010
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Leto Atreides II is on a distinguished road
Default

Gah! Son of a b***h. Some white smoke started coming out of the engine on the way home tonight. Just had oil change and brake fluid flush done yesterday.

Anyway... the mechanic thinks it is actually both the hose and the upper intake manifold. There'* small leaks on both sides. At the hose it looks like there is some corrosion.
Leto Atreides II is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1996 3800 series II, elusive Vaccuum leak grtpumpkin 1992-1999 41 01-15-2016 03:09 AM
3800 s1 coolant leak? 95regalcustom General GM Chat 10 02-27-2011 09:24 PM
3800 Series II Oil Leak mussinc 1992-1999 10 07-18-2009 05:30 PM
3800 SUPERCHARGED vs, 3800 SERIES 2 ColorMeBadd2 Performance, Brainstorming & Tuning 3 11-19-2006 02:48 AM
Coolant Loss 3800 series II SC LS5VETTE 1992-1999 22 04-26-2004 09:26 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 05:42 PM.


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.