No heat at 90 degrees on climate control 93 caddy
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HT4100 4.1, 4.5, 4.9 Discussion, No heat at 90 degrees on climate control 93 caddy in Cadillac Engine Technical Discussion; Car has no heat with climate control temp sent at 90 cars runs great no heat blows cold air....
  1. #1
    mike93 is offline Cadillac Owners Fanatic
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    No heat at 90 degrees on climate control 93 caddy

    Car has no heat with climate control temp sent at 90 cars runs great no heat blows cold air.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: No heat at 90 degrees on climate control 93 caddy

    The core is clogged or has air in it. If you are not overheating, I'd suspect clogged. Flush it.

  4. #3
    shuffler is offline Cadillac Owners Member
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    Re: No heat at 90 degrees on climate control 93 caddy

    Quote Originally Posted by mike93 View Post
    Car has no heat with climate control temp sent at 90 cars runs great no heat blows cold air.
    Remove the glove box @ 5 screws. You'll find an electric motor with a rod attached to it close to the back of the firewall. This part controls a door that allows hot from the heater core or cold air from the evaporator to enter the car.

    Check and see if the electric motor is moving the rod and door it is attached to by adjusting the temperature up and down on the climatic control panel.

    If the rod is all the way to the left it is in the cold position and all the way to the right is hot. You can also snap the rod out of the electric motor to operate the temperature control door manually for verification.

    If the motor is not moving the rod it could be a bad electric motor (check for power to the motor first) or one of the controllers to the climatic control system.

    Be careful with the air bag system. You will want to pull the aur bag fuse

  5. #4
    mike93 is offline Cadillac Owners Fanatic
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    Re: No heat at 90 degrees on climate control 93 caddy

    Nope not overheating she's running great so ill flush it ranger

  6. #5
    steelybill is offline Cadillac Owners Enthusiast
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    Re: No heat at 90 degrees on climate control 93 caddy

    Doesn't that car have a vacuum controlled coolant valve for the heater?

    Not familiar with the Deville that year. I have a Fleetwood.

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: No heat at 90 degrees on climate control 93 caddy

    I wouldn't swear to it, but I don't think so.

  8. #7
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    revdowrong is offline Cadillac Owners Fanatic
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    Re: No heat at 90 degrees on climate control 93 caddy

    Let me guess it's never been replaced. Try flushing it first but it sounds like it's time to replace it.

  9. #8
    mike93 is offline Cadillac Owners Fanatic
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    Re: No heat at 90 degrees on climate control 93 caddy

    ok ill try that and ill let u know what happens

  10. #9
    HUF's Avatar
    HUF
    HUF is offline Cadillac Owners Connoisseur
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    Re: No heat at 90 degrees on climate control 93 caddy

    Quote Originally Posted by mike93 View Post
    ok ill try that and ill let u know what happens
    Flush and BACK flush. Watch the heater core for a while. Mine developed leaks from the gaskets. Had to replace with all aluminum aftermarket one. The original heater core had two plastic side tanks.

  11. #10
    skipcarver42 is offline Cadillac Owners Member
    Automobile(s): 1995 Deville, 86K miles
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    Re: No heat at 90 degrees on climate control 93 caddy

    I just had the same problem with my 95 Deville. I had the cooling system flushed and a new thermostat. It turned out that the heater core was plugged and couldn't be flushed. The flushing, new thermostat and fresh coolant along with a new heater core cost me $258. I was happy with that. It is getting cold in Indiana.

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