5.0 307 Oldsmobile 1987 Fleetwood Brougham Oveheat
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 4 of 4
5.0 and 5.7 Discussion, 5.0 307 Oldsmobile 1987 Fleetwood Brougham Oveheat in Cadillac Engine Technical Discussion; Hey, I drive a 1987 Caddy Fleetwood Brougham Hearse (yeah, THAT kind of Hearse) and the engine has been having ...
  1. #1
    The-Dullahan is offline Cadillac Owners Master
    Automobile(s): Orange And Purple Lights.
    Join Date
    Jun 2009
    Location
    Sitting on The Levee
    Age
    26
    Posts
    6,526

    5.0 307 Oldsmobile 1987 Fleetwood Brougham Oveheat

    Hey, I drive a 1987 Caddy Fleetwood Brougham Hearse (yeah, THAT kind of Hearse) and the engine has been having a strange issue lately. If I drive at about 65 or so for a while the COOLANT TEMP light suddenly blips on. If I slow down, it stops. This is a new problem of the many I have had. The water pump and thermostat are less than a year old, so I would not imagine it is that. The belts are new too, though I will try having them tightened to see if that helps, because sometimes I hear them squeak. I hear that it may be the Fan Clutch. From my understanding, the best way to test the clutch is to let the engine warm up a bit and then turn it off and try spinning the fan. It should have "moderate resistance" and then you should heat the engine up with a short drive and test it again. It should have an increase in resistance.

    Does anyone have any idea what the problem may be? Anything I missed?


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    The-Dullahan is offline Cadillac Owners Master
    Automobile(s): Orange And Purple Lights.
    Join Date
    Jun 2009
    Location
    Sitting on The Levee
    Age
    26
    Posts
    6,526

    Re: 5.0 307 Oldsmobile 1987 Fleetwood Brougham Oveheat

    Hey, I said "if I slow down it stops" and what I mean by that isn't that the car stops, I mean that if I slow down a bit when the COOLANT TEMP light goes on that the light will go off. Nearly instantly, actually.

  4. #3
    SSG
    SSG is offline Cadillac Owners Member
    Automobile(s): NONE
    Join Date
    Nov 2009
    Posts
    26

    Re: 5.0 307 Oldsmobile 1987 Fleetwood Brougham Oveheat

    When the engine is cold, open the radiator cap and check the coolant level. If it's low and your overflow tank is full; you have a bad radiator cap. Try that for a start. I had over heating problems with an '87 that I had. It turned out to be the radiator core.

  5. #4
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,831

    Re: 5.0 307 Oldsmobile 1987 Fleetwood Brougham Oveheat

    The fan clutch disengages at freeway speeds so its not that. You have a classic symptom of a plugged up radiator. Faster you drive, the faster the coolant must circulate. If it cannt circulate fast enough then the engine holds hot coolant so eventually the engine temp is above normal. Pull the radiator and have it flow tested to confirm. Dont be surprised if the radiator shop says the core is thin and cannt be rodded to unplug it. Be prepared to replace the radiator. THIS CAR NEVER WENT PAST 50 MPH PRIOR TO YOU OWNING IT SO NO SURPRISE. AND THE RADIATOR IS 22 YEARS OLD AFTER ALL!

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