Recommended Posts

My 96 Deville keeps overheating.. I've tested the heads for leaks.. passed. changed the tstat twice. put new radiator hoses. flushed the radiator and the engine. This has been over the corse of 3 weeks. everytime i change a part or add new fluid she runs fine for two days an then will not cool down. fans work properly, no leaks. When it runs hot the hoses are full af fluid and tight as if there is no circulation hense the change of the tstat.. like i said, ran fine for 2 days and did the same thing. tried flushing the system thinking there was a clog but again, after i was done she ran fine for a day and a half an overheated again. Tomorrow I'm suppose to change the water pump?? Any advise before i start this procedure? Pls? Jay.. bka.. rotwyla. thanks in advance.

Share this post


Link to post
Share on other sites

Before changing the water pump and before doing ANYTHING ELSE to it.... check for flow from the purge line going from the engine to the coolant tank.

If that line is stopped up, it WILL over heat.


Posted Image

Share this post


Link to post
Share on other sites

My 96 Deville keeps overheating.. I've tested the heads for leaks.. passed. changed the tstat twice. put new radiator hoses. flushed the radiator and the engine. This has been over the corse of 3 weeks. everytime i change a part or add new fluid she runs fine for two days an then will not cool down. fans work properly, no leaks. When it runs hot the hoses are full af fluid and tight as if there is no circulation hense the change of the tstat.. like i said, ran fine for 2 days and did the same thing. tried flushing the system thinking there was a clog but again, after i was done she ran fine for a day and a half an overheated again. Tomorrow I'm suppose to change the water pump?? Any advise before i start this procedure? Pls? Jay.. bka.. rotwyla. thanks in advance.

DO NOT change the water pump unless it is leaking coolant from the weep hole under the water pump housing. All that will do is lighten your wallet and will not solve the problem.

Check the purge line as Jim suggested. There is a TON of information on that in the searchable archives.


Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

Share this post


Link to post
Share on other sites

I have a 96. It started overheating. Everything checked out fine. Turns out the relays for the radiator were flaking out. The fan was not turning on but the A/C fan would run. I cleaned up the relays and the problem has been gone for the last 4 years!

Good luck!

Share this post


Link to post
Share on other sites

Note that bad cooling fans or relays will throw OBD codes P0480 through P0485. This kind of think is why I always want to know what the OBD codes are before I venture much.


CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

Share this post


Link to post
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.