Jump to content
CaddyInfo Cadillac Forum

2000 DHS Surge Tank Problem


Recommended Posts

If anyone can shine some light on my situation, it would be a great help. Trying to diagnose a surge tank problem. Got a check coolant level warning coming on. No overheating problem whatsoever, temperature always stays normal. Feed line nipple out the bottom of the tank has a crack and a leak. I will replace the tank (assuming I can find one), but is it normal for the level of the coolant to change dramatically? Attempted repair and filled tank to "low cold" fill line, ran it about 20 min variable conditions and temp got to normal. Checked it 4 hours later and level was half of the fill line level. Ran it again for 20 min, sat for 3 hrs, checked the tank again while running and there was no coolant in the tank whatsoever.

Is my car simply pushing out excess coolant or is the crack enough to cause that much of a problem? What is the correct way to ensure the proper level of coolant in the system?

Link to comment
Share on other sites


The tank is pressurized when the engine is running.

If it has a crack in it and is leaking...then that is where your coolant is going.

The leak has to be stopped before you can maintain proper coolant level.

Which probably means replacing the cracked tank.

Posted Image
Link to comment
Share on other sites

The tank is about $125 from the dealer, I replaced mine last year. They crack, you can not fix it, to hold 15 to 18 PSI, its leaking. Just replace it

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

The tank is about $125 from the dealer, I replaced mine last year. They crack, you can not fix it, to hold 15 to 18 PSI, its leaking. Just replace it

Amazon has the tank for about $72.00, here is the link

http://www.amazon.com/ACDelco-25774005-Rad...d=1VP8N3JA88FAJ.

Hope it helps

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...