I took the car to the shop and got the heat fixed so i thought. they flushed the system out but now there is smoke coming in my car through the vents and smoke coming out from under the hood while i am driving. i just picked it up from the shop. i called back and they said it was the heater core. does anyone know how to change the heater core.. do i have to take the whole dash off? or is it something easy i can get to under the dash?
If your 83 deville is a coupe like mine then you can access the heater core from under the hood, not the interior of the car. take a look at the blower motor and you'll see that the plastic cover that it is mounted on comes out. under that large plastic cover you'll find the heater core. it takes a while to get all the little screws out, but it's more monotonous than difficult. you'll have to disconnect the blower cables, the temp. sensor and harness, and a few little ground wires and you're there. once you get to the core it's really self explanatory. undo the hoses, replace the core, clean out the piles of pine needles that have accumulated over the years, then put it all back together. if you have the core in hand, then you can replace it in 2 hours if you take your time. hope this helped. let me know if you have any troubles.
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I bought a 2000 caddy Deville off the side of the road, had a 800.00 sign on it, pullover to see it, a man came out and said he had it to four shops and they can't figure it out. gave 700.00 for it and had to tow it home., flushed radiator, heater core, and engine out, changed thermostat, checked water pump. this Northstar engine would over heat when driving it. Turned out to be the plastic cover underneith, it hooks to the front bumper and goes to the metal frame to block the wind. when it is missing, the wind blows in and back drafts the radiator so the fans can't do their job and cool the motor. a five dollar cover from the junkyard and it was fixed, crazy hu. I hope this helps someone.
Feel the 2 tubes at the firewall for the heater core. If they are not getting hot, the heater core needs to be flushed out or replaced. I had this problem with a 1990 Cadilac Deville, it was just a plugged up heater core.
Remember to install sealant after flushing out the system to prevent leaks.
Check whether the heater core is clogged by feeling the two tubes at the firewall that lead to the heater core. If they are cool rather than hot when the car is at normal operating temperature, the heater core will have to be flushed out, or replaced.
If the two tubes at the firewall are hot, but the interior doesn't get heat, then a blend door problem may exist where it is at the wrong angle due to a faulty vacuum motor, or control for the vacuum motor.
Good luck on getting heat inside of your 1998 Cadillac Deville.
Feel the hoses going to heater core, one should be hot and the other warm. If one is cold or both are then heater core is clogged. Make sure heater control valve works and as vacuum to it and or the cable is free.
Purchase a tee made by Prestone at any auto parts store. Install the tee to the heater hose and flush it by their instructions. This way you also will flush out the heater core as well. Flushing the way you describes only gets the job halfway clean
The heater core runs off of the cooling system, it is a small "radiator" behind the dash that sits in a box. when the heater core is full of hot coolant, it gives off heat and the blower motor pushes the hot air to the vents.
If a heater core ruptures, becomes clogged with parasites, or gets blocked in a hose (the 2 leading to the firewall under the hood on the passenger side) it causes the car to overheat, and/or leak.
my suggestion is to have the system pressure tested, and flushed if it checks out OK
Have your heater core backflushed. These vehicles use DexCool and they clog up terribly. The DexCool antifreeze does not mix with anything so you will need to flush the system. Hope this helps.
I have a 92 Deville. All the flushing in the world will not fix the cloged up heater core. The flush will clean out the passenger side of the core but will not clean the core on the drivers side. I have just repaced my core and seen how these fail, It is a bad design that caddys are known for. It was recomended I do a total flush of the system every 30,000 and then just maybe I would not have to endure the core change again. As the antifreeze runs through the car it does a chemical change due to all the different metals and rubber it flows through. since the heater core is small with small bands to let the coolant in and out, it builds up with the sludge from the chemical change. Thus closing off the drivers side first. Note, both the inlet and outlet are on the passenger side, you really cant flush fluid where it builds up the sludge in the core. Solution, new core after trying a flush