Question about 1998 Cadillac Catera

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Overheating leaking water profusly especially when you turn it off. Leaking somewhere behind the motor, also passenger side heat is blowing cold air

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3 possible causes.... low anitifreeze from loose or blown line, failed thermostat.... the cheap kind locks in the closed position ( if you replaced it just before the problem happened then it was possibly put in bk wards... and will not open... always put the style in that fails in the open position... or blown water pump, empellers wear off and it doesn't move the water.... this will cause the hot fluid to boil and spill out of the reservoir or rad cap which will leak down the engine and appear to be coming from else where... worst case is your antifreeze wasn't strong enough and you cracked the block.

Posted on Apr 10, 2015

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With the location of the water leak and the cold air, it sounds as if the heater core is leaking or one of the heater hoses going to or from the core has a hole in it. The heater core is on the passenger side of the vehicle, inside, against the firewall. Is the carpet wet underneath on that side?

Posted on Mar 23, 2011


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Overheating leaking water profusly especially when you turn it off. Leaking somewhere behind the motor, also passenger side heat not working blowing cold air.

It sounds like you have a busted heater core hose. The only solution is to pin point the leak and replace the hose that's leaking. There are usually two heater core hoses coming out of the firewall on the passenger side of the vehicle. Examine both of them carefully for a blowout. Many times when a hose goes bad or is getting ready to go bad, it will have some swelling or deformation around the end of it. I hope this helps.

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