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1978 Coupe Deville
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42 Posts
Discussion Starter #1
I am a new member (1978 Coupe Deville, 8700 original miles) and need some help with coolant loss. After running the car there is a leak of coolant from the same place the A/C condensation is dripping from. Also, on engine start-up it sometime smells like coolant from the vents. Is my heater core leaking (no coolant in the footwell though) or what could this be? Your help is appreaciated. Also, anyone know a good Cadillac speciailst in South Florida?
 

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'80 Fleetwood Coupe, 1994 and 1995 Mercedes 140 Coupe
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2,096 Posts
Sure sounds like a bad heater core. You might also see fog on the inside of the car's glass where once there was none.
 

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2014 ELR
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9,842 Posts
Yep, just a bad heater core. Not a bad job to do. About two hours for a competent mechanic (book time is likely 4, though). Do you drive the car when it is cold? If not, you can just bypass it...
 

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1978 Coupe Deville
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42 Posts
Discussion Starter #4
don't really need the heat as I live in Miami so I could bypass the heater core, however, I am trying to get this car to the way it looked/and worked when it was brand new... car is in the shop as we speak, mechanic confimred that it looks like a leaking heater core, proably too difficult of a job for me to handle myself, and yes, 4 hours quoted. Definitely also had the white film on windshield. Will tro to post pictures now. Thanks for the advice/
 

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Super Moderator
2014 ELR
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9,842 Posts
If you get a copper "U" bend from Home Depot in the right diameter to fit in the hoses, you can bypass it at the core, so the heater hoses are still in place. This way, the car will look stock unless you look really close.
 

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'80 Fleetwood Coupe, 1994 and 1995 Mercedes 140 Coupe
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2,096 Posts
The air conditioning system on this car uses the heater. Bypassing the heater core should only be done on beaters.
 
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