1991 Honda Civic 1991 Honda Civic Coolant Leak

SLEEPING FOREST

MEMBER
1991 HONDA CIVIC
4 CYL
FWD
AUTOMATIC
197,500 MILES

Ok yesterday I discovered a coolant leak in my car. But it's in an unusual place. It's leaking in to the floor on the passenger's side because the carpet is wet. What could be wrong?

Thursday, October 8th, 2009 AT 10:33 AM

4 Replies

HONDA TECH 1818

MECHANIC
536 POSTS

Your heater core could be leaking, just look under the glove box and you will see a big black heater housing there, if you see coolant leaking from there, your heater core is leaking.

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Thursday, January 28th, 2021 AT 9:40 AM

SLEEPING FOREST

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12 POSTS

Do you have a diagram of what it looks like?

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Thursday, January 28th, 2021 AT 9:40 AM

HONDA TECH 1818

MECHANIC
536 POSTS

I was unable to upload a diagram, but it involve in removing the dashboard and lots of other components to replace the heater core. You should try radiator stop leak to see if that will stop the leak.

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Thursday, January 28th, 2021 AT 9:40 AM

KHLOW2008

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41,814 POSTS

Did you confirm it is coolant or just water that is causing the carpet to be wet? Coolant leakage into cabin would have the radiator running dry, make sure you check the level.

Coolant would be from the heater core as answered by kng1818 but if it is just water, it could be the the AC evaporator (cooling coil) housing drain hose has been dislodged or clogged .

You would have to remove the dash to get at the heater core.