Over heats after water pump replacement
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
Results 1 to 14 of 14
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Over heats after water pump replacement in Past Cadillac Vehicle Discussion; Have a 2002 Deville. The car got hot and was shut down on the interstate. My wife said lights came ...
  1. #1
    2pyro2 is offline Cadillac Owners Member
    Automobile(s): 2002 deville
    Join Date
    Feb 2012
    Posts
    14

    Over heats after water pump replacement

    Have a 2002 Deville. The car got hot and was shut down on the interstate. My wife said lights came on and had a loss of power. My mechanic replaced water pump (it was leaking),thermostat and belt. Ran the car for a good long time, no issues with temp. readings ect.
    Took it out and at 65 mph it started to overheat again.
    I let it cool checked fluid levels witch were fine and drove it home about 10 miles.
    At 45 - 50 MPH the temp gauge stayed write in the middle where it should. I increased speed to 70 MPH after driving about 8 miles and the temp gauge started to rise to the 3/4 hot mark.
    Slowed down to 45 and the gauge returned to the middle.
    I have not looked at purge line yet however I would think the mechanic would..
    Do you think I have issues with head gasket?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    alfarop1999 is offline Cadillac Owners Member
    Automobile(s): 2002 Deville
    Join Date
    Jan 2013
    Age
    24
    Posts
    46

    Re: Over heats after water pump replacement

    do u have the a/c on when it starts overheating? i heard having the heater on helps it from overheating...

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    44,579

    Re: Over heats after water pump replacement

    A/C has nothing to do with overheating. Having the heater on has nothing to do with overheating - matter of fact, in the OP's car, coolant flows through the heater core at all times - heated air is the product of blend door opening between heat and cool settings - and that door moves in response to cabin air temp sensor readings compared to what temp you have set into the system main panel.

    2pyro2, Read the entire Cadillac Technical Archive way up ^^^ in the top black bar. Then go to Engines, Northstar Performanceand read the three or four sticky threads on coolant, temp gauges, Northstar head gaskets, and read up on how to do a Northstar cylinder block exhaust gas test.

    ANY guess as to the cause of your temp gauge movements is pure speculation until you get into the cooling system and rule out leaks, flow problems, fan operation, and exhaust gas testing. It's ALL covered in here.

  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
    73,350

    Re: Over heats after water pump replacement

    Quote Originally Posted by 2pyro2 View Post
    I have not looked at purge line yet however I would think the mechanic would..
    THAT would be the first thing to check.

  6. #5
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
    Join Date
    Feb 2004
    Location
    Minnesota
    Age
    63
    Posts
    9,851

    Re: Over heats after water pump replacement

    Quote Originally Posted by alfarop1999 View Post
    do u have the a/c on when it starts overheating? i heard having the heater on helps it from overheating...
    ---------------------------------
    the heater core is a constant-flow design -
    meaning - hot coolant is ALWAYS flowing through the heater core -

    turning the cabin temperature up to 90*
    might help dissipate some of the excess heat -
    but is hardly an option during the summer

    and in a PROPERLY working system -
    you should be able to run the AC on full blast -
    with outside temps above 110* -
    without the system running hot -

    ----------

    I have not looked at purge line yet
    however I would think the mechanic would..

    the PURGE LINE is unique to the Northstar motor -
    so unless the mechanic works on a lot of Cadillacs -
    it is NOT too surprising that he might not know about it -

    OH - and a clogged line is NOT UNCOMMON -
    and WILL cause overheating -

    Do you think I have issues with head gasket?
    the BLOCK TEST is the DEFINITIVE TEST
    for failed head gaskets in a Northstar motor -

    you can "rent" the kit for free -
    and just pay for the "blue juice" - less than $10 -
    from most big auto parts chain stores -

  7. #6
    2pyro2 is offline Cadillac Owners Member
    Automobile(s): 2002 deville
    Join Date
    Feb 2012
    Posts
    14

    Re: Over heats after water pump replacement

    Thanks for the info. I think we need to leave the heater and AC issues as they have no bearing to my problem.
    I just pray the head gaskets are not bad. i know the engine went into camel drive mode when it got hot so maybe the heads are ok. Will do leak down and pressure testing as soon as I can as well as check the purge tube..

  8. #7
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    44,579

    Re: Over heats after water pump replacement

    Don't worry about heads and camel mode - the engine will run hot as a firecracker and sustain no damage - other than that which caused the overheat in the first place.

    Purge line - and the water pump drive system, particularly the spring-loaded tensioner arm pulley.

    Do a block test - either rent the tool and buy the fluid from a large parts store or use this - don't try to "make it better" - follow the instructions.

    www.sjdiscounttools.com/lis75500.html

  9. #8
    2pyro2 is offline Cadillac Owners Member
    Automobile(s): 2002 deville
    Join Date
    Feb 2012
    Posts
    14

    Re: Over heats after water pump replacement

    I'm sure when I had the belt replaced my mechanic checked the tensioner on the pump system however when I asked him about the Purge system and checking for obstruction in the line he admitted that he did not know of problems with the purge line. Just goes to show you even the best mechanics don't know everything. I am hopeful that will be the issue.

  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
    73,350

    Re: Over heats after water pump replacement

    It is hard, if not impossible, for a general shop to know the idiosyncrasy's of every car and engine. That's where the dealer experience pays off, but as we all know, there is a price to be paid for that.

  11. #10
    mc_marto's Avatar
    mc_marto is online now Cadillac Owners Fanatic
    Automobile(s): 1991 Cadillac Sedan deVille
    Join Date
    Aug 2011
    Location
    Conway, AR
    Age
    24
    Posts
    165

    Re: Over heats after water pump replacement

    I am sure Ranger, Sub or some of the other guys here will correct me if I'm wrong, but I have two things in mind. First, what if the new thermostat that was installed is defective, or opens up at higher temperatures? And, second, what if there is a defective relay for the cooling fans, which will not let them engage when needed?

  12. #11
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
    Automobile(s): Crimson 2001 Seville STS, 1990 Seville (RIP)
    Join Date
    Sep 2010
    Location
    East Boston MA.
    Age
    26
    Posts
    21,389
    A faulty thermostat is a possibility, but unlikely.

    The cooling fans move air through the radiator when stationary and at low speeds. At ~25-30 MPH, airflow through the radiator is high enough to where the fans don't do any good. In this case, it's overheating at higher speeds, so it's not the fans.

  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
    73,350

    Re: Over heats after water pump replacement


  14. #13
    2pyro2 is offline Cadillac Owners Member
    Automobile(s): 2002 deville
    Join Date
    Feb 2012
    Posts
    14

    Re: Over heats after water pump replacement

    Well I checked the Purge line it is OK. Then ran block test. Results positive for combustible gasses in cooling system. "CRAP" looks like head gasket time.

  15. #14
    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
    73,350

    Re: Over heats after water pump replacement

    Ouch!

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