Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Engine won't get hot!

Discussion in 'The Garage' started by K-5 Bomber, Mar 9, 2007.

  1. K-5 Bomber

    K-5 Bomber 1/2 ton status

    Joined:
    Aug 20, 2006
    Posts:
    108
    Likes Received:
    0
    Location:
    Northeast California
    And it's not the T-sat. I already changed it and tested the one that I pulled out. The old one was still opening at 195*. Now my wife has an '86 and it's doing the same thing. What gives? My heater used to be one of the best pieces of equipment on my truck. Now it just blows. Someone, please bless me with some divine insight!
     
  2. dhcomp

    dhcomp 3/4 ton status Premium Member

    Joined:
    Mar 17, 2001
    Posts:
    9,851
    Likes Received:
    280
    Location:
    Truckee, CA
    the engine won't get hot, or the heater won't get hot? IF heater, your heater core could be plugged up pretty good...
     
  3. K-5 Bomber

    K-5 Bomber 1/2 ton status

    Joined:
    Aug 20, 2006
    Posts:
    108
    Likes Received:
    0
    Location:
    Northeast California
    Heater core is brand new. Temp guage reads somewhere near 140*.
     
  4. 76zimmer

    76zimmer Flyin Rat Premium Member GMOTM Winner

    Joined:
    Nov 14, 2005
    Posts:
    23,029
    Likes Received:
    1,347
    Location:
    Kzoo, Mi
    get a infrared temp gun, and check different areas of your cooling system. I'm sure the engine is putting out the heat, it just a matter of where its going. That temp guage may be off too. What shape is the radiator(s) in.
     
  5. gmc4cw

    gmc4cw 1/2 ton status GMOTM Winner

    Joined:
    Jul 19, 2006
    Posts:
    3,907
    Likes Received:
    0
    Location:
    west chester, Pa
    if the heater core was just replaced it could have air trapped in it.
     
  6. 4xcrazy

    4xcrazy 3/4 ton status

    Joined:
    Oct 31, 2003
    Posts:
    9,471
    Likes Received:
    5
    Location:
    Olympia/Lacey, Washington
    I think you JUST woke up when you posted this comment,,,,:crazy:

    You are going to have to some serious looking in to the system, fan clutch opperating properly, water flow, check the cap to make sure it's holding pressure, check the temps around the motor, SOMETHING isn't working like it should, and even if the t-stat was staying open, due to failure, you shold still get more heat than 140*, obviously it would heat up if it were stuck closed.

    BTW, after replacing the heatercore,,,,i would HOPE your water pump would have enough pressure to push out the air in the system after running a bit :wink1: :rolleyes:
     
  7. Jason4x4

    Jason4x4 1/2 ton status

    Joined:
    Nov 5, 2006
    Posts:
    4,505
    Likes Received:
    6
    Location:
    Chandler, AZ
    are the heater hoses hooked up correctly, one to the intake or w/p, and one to the radiator, if they are both hooked up on the engine side it might not work properly, also, do you have a fan clutvh or is it run direct?
     
  8. Thunder

    Thunder 3/4 ton status

    Joined:
    Jul 20, 2000
    Posts:
    8,946
    Likes Received:
    1
    Location:
    Northeast Nevada
    Maby you have heater controll problems. Bad/missing Vaccum line or a broken or loose cable?
     

Share This Page