Coolant Leak from Throttle Body? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 01-28-2016, 08:40 PM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Apr 2010
Location: Frederick Co. Md.
Posts: 58
Thanks: 0
Thanked 1 Time in 1 Post
Mr. Bill is on a distinguished road
Default Coolant Leak from Throttle Body?

93 SE. Noticed a little steam coming from under the hood and out the back of the fender when I opened the door a week or so ago and when I looked for the origination of it, it appears that there is coolant dripping from the underside of the throttle body onto the exhaust manifold shield. It'* not a big leak and seems to do it more when cold then when warmed up. I'm sure at some point that it'* going to get worse. Where is this leak coming from? Does the TB have coolant running through it? Is this an easy fix? Thanks as always.
Mr. Bill is offline   Reply With Quote
Old 01-28-2016, 10:07 PM   #2
Senior Member
True Car Nut
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

Yes, coolant does run through the throttle body. If coolant is leaking from the gasket between the plastic UIM and the metal throttle body, you should be able to replace the gasket and call it a day. The other possibility is that the plastic of the UIM has degraded and is starting to fail, in which case you would notice signs of that, and should be on the lookout for it. If the plastic is cracked or failing, the UIM should be replaced, and the LIM gaskets with it.

I also had the top radiator hose dripping on the exhaust crossover at one point, and it took me a while to track that down.

My UIM did fail on the PA, but mine was leaking from between the LIM and UIM. If the throttle body gasket is failing however, you do run the risk of ingesting coolant which can go very badly very quickly.
rjolly87 is offline   Reply With Quote
The Following User Says Thank You to rjolly87 For This Useful Post:
WilliamE (01-30-2016)
Old 01-28-2016, 10:44 PM   #3
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,152
Thanked 786 Times in 615 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

I don't think they had the plastic upper manifold on a '93....

However, I agree on the throttle body gasket....
Tech II is offline   Reply With Quote
The Following User Says Thank You to Tech II For This Useful Post:
WilliamE (01-30-2016)
Old 01-29-2016, 06:57 PM   #4
Senior Member
True Car Nut
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

Quote:
Originally Posted by Tech II View Post
I don't think they had the plastic upper manifold on a '93....

However, I agree on the throttle body gasket....
They do, '93-'95 L27'* should all have them.
rjolly87 is offline   Reply With Quote
Old 01-30-2016, 12:56 PM   #5
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,152
Thanked 786 Times in 615 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

You are correct....I was thinking of the LN3, 3800....sorry....
Tech II is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Coolant Leak near Throttle Body 93RedSled-SSE 1992-1999 5 02-23-2008 04:11 PM
Throttle-body Coolant Bypass? Hyundai jwakamud Lounge 0 07-28-2006 12:54 AM
M62 Throttle Body Coolant Bypass... clm2112 Performance, Brainstorming & Tuning 11 07-16-2006 02:50 PM
Throttle Body and Throttle body spacer! DeeGee96SE Performance, Brainstorming & Tuning 5 06-29-2004 01:21 AM
Throttle Body Coolant Plug..? toxictelevision Performance, Brainstorming & Tuning 4 03-11-2004 01:11 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 05:25 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.