C4 General Discussion General C4 Corvette Discussion not covered in Tech

2 Problems at once

Thread Tools
 
Search this Thread
 
Old Mar 28, 2017 | 03:53 PM
  #1  
SuperDave02's Avatar
SuperDave02
Thread Starter
Racer
10 Year Member
 
Joined: Jul 2011
Posts: 339
Likes: 6
From: Lompoc California
Default 2 Problems at once

Got my 87 running pretty good now, but,

1. When I try to read the codes, the chk engine light just stays on, no blinking. Is A & B the right pins to short?

2. There is water coming from under the rubber pad that is against the front of the foot well. Im assuming a bad heater core?
I thought it was the door seals and rain, kept getting the water out of the carpet, but today went ahead and pulled the carpet out and found the water coming from front of foot well.

Just when I thought I would be able to drive it
Reply
Old Mar 28, 2017 | 04:58 PM
  #2  
gerardvg's Avatar
gerardvg
Safety Car
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Aug 2009
Posts: 3,752
Likes: 278
From: Melbourne, Victoria, Australia
Default

Originally Posted by SuperDave02
Got my 87 running pretty good now, but,

1. When I try to read the codes, the chk engine light just stays on, no blinking. Is A & B the right pins to short?

2. There is water coming from under the rubber pad that is against the front of the foot well. Im assuming a bad heater core?
I thought it was the door seals and rain, kept getting the water out of the carpet, but today went ahead and pulled the carpet out and found the water coming from front of foot well.

Just when I thought I would be able to drive it
Hi

Yes the top far right terminals are the A & B pins, if they are not shorted and ignition is on the check engine light will stay on.
Use a paper clip or a piece of wire and push in all the way, then the light should flash codes.

If you have coolant on the carpet then the dreaded heater core change will be needed, you will learn new swear words.........
The usual consensus is GM started with a heater core and built the car around it ........

Buy a new heater core, pressure TEST it before putting it in

Make sure it is not a blocked a/c evaporator drain in engine bay, if it is just water it could be a windscreen leak but coolant ... yep that is one of the worst repair jobs ... I would rather replace the universal joints or rear hub wheel bearings ...

Good Luck
Reply
Old Mar 28, 2017 | 06:43 PM
  #3  
SuperDave02's Avatar
SuperDave02
Thread Starter
Racer
10 Year Member
 
Joined: Jul 2011
Posts: 339
Likes: 6
From: Lompoc California
Default

Originally Posted by gerardvg
Hi

Yes the top far right terminals are the A & B pins, if they are not shorted and ignition is on the check engine light will stay on.
Use a paper clip or a piece of wire and push in all the way, then the light should flash codes.

If you have coolant on the carpet then the dreaded heater core change will be needed, you will learn new swear words.........
The usual consensus is GM started with a heater core and built the car around it ........

Buy a new heater core, pressure TEST it before putting it in

Make sure it is not a blocked a/c evaporator drain in engine bay, if it is just water it could be a windscreen leak but coolant ... yep that is one of the worst repair jobs ... I would rather replace the universal joints or rear hub wheel bearings ...

Good Luck
The water is clear no coolant in it, so something in the fire wall. there is no water leaking from the top of the windshield, there is a little in front of pass. door. but not the amount i found in the foot well. Water was all the way up to the front of the seat. So I think I need to look into the vents at the bottom of the windshield. see if I can get the covers off and see down there, is there a drain under the car I can probe to see if there is stuff blocking it?
Reply
Old Mar 30, 2017 | 07:23 PM
  #4  
SuperDave02's Avatar
SuperDave02
Thread Starter
Racer
10 Year Member
 
Joined: Jul 2011
Posts: 339
Likes: 6
From: Lompoc California
Default Found where water is coming from

Did some reading last night, found out there is two hoses that come from under the cowling. Checked those today and both right and left side had dirt in them. The right more than the left. cleaned it out and ran some water through the cowling to flush out anything else. Read there is supposed to be one somewhere in the middle to, but couldnt find one.

Got all the rubber and matting pulled up inside the pass. foot well letting it all dry out.
Reply
Old Mar 30, 2017 | 10:13 PM
  #5  
ToniJ1960's Avatar
ToniJ1960
Burning Brakes
10 Year Member
 
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
Default

Originally Posted by SuperDave02
Did some reading last night, found out there is two hoses that come from under the cowling. Checked those today and both right and left side had dirt in them. The right more than the left. cleaned it out and ran some water through the cowling to flush out anything else. Read there is supposed to be one somewhere in the middle to, but couldnt find one.

Got all the rubber and matting pulled up inside the pass. foot well letting it all dry out.
I noticed my carpet on the drivers side wet after it rained sometimes and not a bit of water around the door area I bet this is it I need pictures
Reply
Old Mar 30, 2017 | 10:31 PM
  #6  
SuperDave02's Avatar
SuperDave02
Thread Starter
Racer
10 Year Member
 
Joined: Jul 2011
Posts: 339
Likes: 6
From: Lompoc California
Default

Originally Posted by ToniJ1960
I noticed my carpet on the drivers side wet after it rained sometimes and not a bit of water around the door area I bet this is it I need pictures
Pull the fender panels right in front of the doors. Right behind the battery is a 1/2" rubbber hose hanging down. squeeze the bottom of it and dirt or other debri will fall out. run some water in the cowling to flush it out, make sure to replace it straight back down so any other water wont get into the battery tray in the future. The pass side one is to the left after you get the panel off, about an inch around, about 5 inches long.
Reply
Old Mar 31, 2017 | 01:01 AM
  #7  
ToniJ1960's Avatar
ToniJ1960
Burning Brakes
10 Year Member
 
Joined: Jul 2013
Posts: 1,027
Likes: 30
From: Granite City Illinois
Default

thank you that sounds easy enough, not like I enjoy removing that darn fender again though
Reply

Get notified of new replies

To 2 Problems at once





All times are GMT -4. The time now is 01:02 PM.

story-0
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-1
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-2
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-3
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-5
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-6
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-7
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-8
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-9
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE