overheating 97 deville
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 18
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, overheating 97 deville in Past Cadillac Vehicle Discussion; ive replaced the thermostat , waterpump & radiator cap. The fans come on at 222F . I drive around on ...
  1. #1
    ntheblak is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2007
    Posts
    35

    overheating 97 deville

    ive replaced the thermostat , waterpump & radiator cap. The fans come on at 222F . I drive around on the hwy & after about 10 miles after it staying between 196-205 it starts climbing to 250. It shuts off the ac.Then n a bit it starts going back down. I'm going to put a temp sending unit to see if its that. Is there something else i should look at.Whats the proper way to fill the cooling system. thanks in advance

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    74,752

    Re: overheating 97 deville

    Why did you replace the W/P? Was it leaking?

    Stop throwing parts at it in hopes that one sticks. First check to be sure that the purge line is clear. If that's clear and flows coolant, borrow a block test kit from AutoZone. Just pay for the test fluid. Run the test.

  4. #3
    ntheblak is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2007
    Posts
    35
    Thread Starter

    Re: overheating 97 deville

    replaced it after pulling radiator to flush. people keep saying blown head gasket. There is no missfire, no moistierafter overheating. on tail pipe. If there is blockage it would cause it to lose fluid? The purge line would cause this ?

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    74,752

    Re: overheating 97 deville

    The purge line, as the name implies, purges air from the system. If it is clogged and can't do it's job, the engine will overheat. Overheating will cause coolant overflow (fluid loss). The '97 also used sealant tabs and they tend to clog the purge line. DO NOT use that crap. Check the line and clear any blockages if necessary. If that checks out, then do the block test.

  6. #5
    ntheblak is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2007
    Posts
    35
    Thread Starter

    Re: overheating 97 deville

    thanks Ranger. Ive heard of the purge line. I looked n the manual but can"t seem to find it. Do you have any idea on where its at ? Thanks again!

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    74,752

    Re: overheating 97 deville

    It's the 3/8" line that runs from the crossover manifold aka W/P housing to the surge tank. Here is a picture of both ends. Pull the line off the surge tank. Twist it off gently. The nipple is brittle and breaks easily. Stick it in the open tank (engine cold). Start the engine and look for flow. If none, the blockage will most likely be at the hollow bolt it is connected to at the other end (U shaped hose with the spring clamp).
    Attached Images

  8. #7
    ntheblak is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2007
    Posts
    35
    Thread Starter

    Re: overheating 97 deville

    pics didn't come up. can u send them to me? will let u know what i find.

  9. #8
    basscatt's Avatar
    basscatt is online now Cadillac Owners 10000+ Posts
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
    Join Date
    Feb 2004
    Location
    Minnesota
    Age
    63
    Posts
    10,504

    Re: overheating 97 deville

    Quote Originally Posted by ntheblak View Post
    pics didn't come up. can u send them to me? will let u know what i find.
    -------------------------------
    you should NEVER post your email on a public forum -
    SPAM hunters always search for active email accounts -

    at lease disguise it by spelling it out - "someone at something dot com"
    -------------------------

    you don't need a picture to find it -

    the PURGE LINE is the only way of expelling air from the Northstar cooling system -

    it is a 3/8 diameter hose that goes from a hollow bolt in the thermostat/waterpump housing area of the engine - and plugs onto a nipple on the side of the SERGE TANK -

    with the engine running - there should be a gentle - constant flow of coolant - from the engine - to the serge tank -

    if there is no flow - the most likely cause is a blockage in the hollow bolt -

    follow the hose towards the engine - with the engine OFF - remove the hose - use a straightened metal coat hanger - or something similar - and poke it into the hollow bolt -

    the coat hanger should go in about 2 1/2 inches -

    once the hollow bolt is cleared - you can briefly start the engine to verify coolant flow - be sure to use some sort of container to catch the coolant so you don't make a mess -

    check the hose and serge tank for blockage -

  10. #9
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    74,752

    Re: overheating 97 deville

    Quote Originally Posted by ntheblak View Post
    pics didn't come up. can u send them to me? will let u know what i find.
    See post #6 again.

  11. #10
    ntheblak is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2007
    Posts
    35
    Thread Starter

    Re: overheating 97 deville

    will go through the checks the next few days. thanks guys. hope its not a blown headgasket! whats confusing is that it oveheated on the way to the movis on the hwy but only got up to 205 on the way back at the same speeds. It was still 83F outside. This one has got me scratching my head.

  12. #11
    ntheblak is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2007
    Posts
    35
    Thread Starter

    Re: overheating 97 deville

    RANGER

    I did the block test on the warm motor for longer than required & it stayed blue! I also tested the purge line & it flowed. I may have cleared it by blowing through the line & the tank connection. I drove it today w/o the ac on for over 20 miles on the hwy & 10 miles stop & go traffic. It hit 222f on the hwy & 230 in the city but cooled back down . I'll run it later w/ac & c what it does.

  13. #12
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    74,752

    Re: overheating 97 deville

    Those temps seem a tad higher than they should be. Is the condenser clear so it can flow air or is if clogged with dead bugs? Can't hurt to blow it out with compressed air and then rinse it with a garden hose.

  14. #13
    ntheblak is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2007
    Posts
    35
    Thread Starter

    Re: overheating 97 deville

    i will do that & test again. the temp the fans come on is 222f per other topics in this forum. at least its not going to 255f now like before.the only other things i think it would b are the temp sending unit, colapsing radiator hose or the radiator itself. We"ll see !

  15. #14
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
    Automobile(s): 14 SRX, 12 Sierra, 00 SLS, 99 Deville 50-year Anniversary
    Join Date
    Mar 2009
    Location
    Dallas, TX
    Age
    23
    Posts
    3,287

    Re: overheating 97 deville

    Quote Originally Posted by ntheblak View Post
    colapsing radiator hose
    Replace your surge tank cap.

  16. #15
    ntheblak is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2007
    Posts
    35
    Thread Starter

    Re: overheating 97 deville

    thanks. I did that.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting