This is a huge job. I suggest taking it to a garage.
As of yesterday, I discovered I have the same problem with the exact same car.
I have bypassed the heater core until I evaluate my options. (You can do that in this part of the country.)
Were you able to effect a repair without paying a Cadillac dealer to do all the work for you ?.
An independent repair shop charged me $340.89 for this work. The core was $193.26 (plus tax), the labor was 1.80 hours at $68.50/hour, plus antifreeze.
The work required is not extensive and there is nothing 'huge' about it. You access the climate control housing by detaching the panel under the passenger air-bag and removing the glove box. The heater core can then be removed from inside the car after removing the back panel from the climate control housing. I had to return the car to the shop as the heater was making a howling noise. As it turned out, there was a leak in the join (between the two panels of the climate control housing) which was rectified by applying a small section of special thick tape to the un-taped part of the join.
leaking heater core
There was no rwd Cadillac Fleetwood in '98
Try the repair tips on the Autozone web site.
you dont, a mechanic does
How do I replace the heater core in my 98 cadillac deville
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how do you change the heater core on a 99 cadillac deville? I need to know, "Kaiser."
I have a 1978 coupdiville cadillac my blower quit working and there is a relay above your fuse box and if it goes bad your heater wont turn on. I had to replace it with a after market heavy duty relay away from where it is originally plugged in. Also my ground wire connection was dirty and wouldn't turn on until I cleaned the connection so try that and see if it works or you might need to replace the motor.
Check the A/C fuse, that's what happened on my '85.
it is on the passenger side right next to the windshield under the hood it is black and has a purple and black wire connected to it
I need to know how to replace the heater core in a 1987 cadillac seville. I would like to have step by step instructions on the removal and replacemnet of this part. Where it is located and how to remove it