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Heating problem


Frank Carbone

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Hello All

I have a 92 Seville with a 4.9L engine and have noticed that I dont get hot air much from the heating system. The car runs at 175F all the time but the air comming from the heater is just luke warm. I have changed all the coolant recently and the thermostat was replaced last winter. I also replaced the rad cap when I replaced the coolant.

Also every once in a while I can smell collant in the cabin but the widows don't fog up and the coolant level seems to be fine. It's not always either.

What is the normal operating temp for this model Caddy?

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I have a 92 Seville with a 4.9L engine and have noticed that I dont get hot air much from the heating system. The car runs at 175F all the time but the air comming from the heater is just luke warm. I have changed all the coolant recently and the thermostat was replaced last winter. I also replaced the rad cap when I replaced the coolant.

Also every once in a while I can smell collant in the cabin but the widows don't fog up and the coolant level seems to be fine. It's not always either.

What is the normal operating temp for this model Caddy?

Sounds like your heater core is plugged. Search the archives for flushing procedure "no heat", "heater core" etc. After I flushed mine it started leaking. The heater core has plastic tanks (just like the radiator) and the gaskets dry out when the core is partially plugged, as soon as you unplug it the core starts leaking. It is a good idea to replace the original core with whole aluminum one for some $35.

175 while driving is normal for the winter.

The saddest thing in life is wasted talent

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Also make sure your airmix door works properly . It should open completely when you set the temp. at 90. Remove the glove box to see the actuatore which closes and opens the airmix door. Search the archives for "airmix door" etc.

The saddest thing in life is wasted talent

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thanks for your help. Is it a big job to replace the heater core? The car has over 200K miles so I wouldn't be serprised if it leaked plus I noticed one day when I opened the rad cap that this piece of rubber was floating around at the top of the rad. I had the rad pressure tested and it was fine. Now I'm wondering if it's something from the heater core.

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thanks for your help. Is it a big job to replace the heater core? The car has over 200K miles so I wouldn't be serprised if it leaked plus I noticed one day when I opened the rad cap that this piece of rubber was floating around at the top of the rad. I had the rad pressure tested and it was fine. Now I'm wondering if it's something from the heater core.

Replacing the heater core is not a rocket science but requires patience and some skills. The most difficult part was putting back all the stuff under the glove box (PCM,BCM, Programmer and particularly the cover) and the heater core hoses are not easily accessible either. But it is doable and may take a couple of hours. Since many of us have done the job you can always get an advice at any point of the job. Are your radiator tanka original? :blink:

The saddest thing in life is wasted talent

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Replacing the heater core is not a rocket science but requires patience and some skills. The most difficult part was putting back all the stuff under the glove box (PCM,BCM, Programmer and particularly the cover) and the heater core hoses are not easily accessible either. But it is doable and may take a couple of hours. Since many of us have done the job you can always get an advice at any point of the job. Are your radiator tanka original? :blink:

Yes as far as I know it is original

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As bbobynski advised give it a try - flush it. I suggested a leaking (ad plugged) core since you mentioned the coolant smell in the cabin. As soon as the flow increases through the core the leak will get worse <_ .>

Last year I had to replace the both radiator tanks (cracked and leaking), the heater valve (the "T") and the heater core as well. Despite the T was generic (NAPA) it was similar to the OEM part. I have plenty of heat.

The saddest thing in life is wasted talent

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