Question about 1995 Cadillac DeVille

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95' Cadillac DeVille has no heat

Hi. After I had my coolant flushed and filled the heat went cold. I suspected a "stuck open" thermostat and changed it. Didn't solve the problem. I then suspected that debri may have clogged the heater core. I flushed it out and with water noticing good flow through the core. Topped off the coolant again and still didn't fix the problem. Coolant supply to the core is hot, but luke warm in the return hose. Blower works great. I'm gonna check the return hose this week, but definately open to suggestions. Thanks.

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  • Anonymous Jan 11, 2009

    I have the same problem. I was told there is an air lock in the heater core so tommorrow i will try and get it out by taking a half gallon of coolant out of the radiator then start the car up with cap off.Just about when the thermostate opens im going to put cap on and pour the coolant i took out earlier in the over flow/low coolant resevoir.keep in mind im going to pinch off the hose on the bypass line by the "t" connector (hose that is bypassing the heater core and connecting with the return line)Im sure this method will drive the air out .I guess time will tell

  • lonniejon2 Jan 22, 2009

    my problem is that i get no heat at all when i turn the heat on it blow out cold air from the defrost and the floor panel i'm thinking its the theomostsic

  • crystalship Jan 28, 2009

    My problem sound the same. Blows hot to luke warm to cold never know what I'm going to get. Just topped off the radiator and it got worse. Air is my suspect!



    Mike B

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There is several ways to see. 1. It could still be the heater core, try blowing air in to IN house, if it comes out the OUT hose strong, its not that. 2. It is posible there is an a pocket in the system. Try bleeding the air hose, that could be it. 3. Take the glove box out, disconnect the air bag CAREFULLY! Start the car, And turn the heat all the way up, then all the way down. U should see a arm move back and forth. MAke sure it goes ALL the way shut, and open. 4. It could be that the doors in the dash don't work. I'm not sure how to do this. Hope the other work!!

Posted on Nov 12, 2009

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You have air in the system. You have to park the car on an incline so the front of the car is higher than the rear, then run the engine with the radiator cap off and let the air escape while topping off the radiatorevery now and then. I was told about the incline to get the radiator higher than the heater core so that the air bubbles could come out.

Posted on Jan 16, 2009

  • Scuz75 Jan 16, 2009

    I forgot to mention to have the heater on hot with the blower on while trying to get rid of the air in the system.

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