Coolant Leak From Heater Core on Chevrolet S10

Problem Description and Possible Solution

The heater core under the right side of the dashboard may leak engine coolant which can puddle on the passenger front floor. The loss of coolant may cause an engine overheating condition. Our technicians tell us that removal of the dash board is necessary to replace the heater on these vehicles.

Problem Data
RepairPal Verified
Average mileage: 150,551 (13,200–270,000)
14 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
64 people reported this problem
Viewing 1 - 20 of 30 comments
need to replace heater core some have said this model you dont have to remove entire dash
I had this too, had to pull out dash and change out heater core, about two days work, plus every time the heater was turned on it smelled like antifreeze inside the cab, that lasted more than a year.
Strong smell of antifreeze coming from vents when i turn up blower motor
2 dash mount screws on right lower, radio out for ease of core case screws,ease dash slightly out, plenty of room,under 2 hrs, easy, cetronia auto allentown pa
it has not been fixed yet but as soon as you poor in water or antifreeze, all of it just dumps out right in between the engine block and the transmission which leads me to believe it is the intake gasket or a blown out freeze plug.
replaced heater core
Radiator core sprung a leak and fogged up the cab. I was able to limp it back home and spent two days to replace it.
replace heater core
It's a minor drip leak and tolerable, so I live with it.
Detailed replacement video is on YouTube. Repair is too expensive and risky.
The dex-coolant cause radiator, heather & cooling system ( water pump replaced ). It was a big mess & cost to fix. Sometime in 2008 there was a lawsuit, but I was to late to make claim, 10/28/2008. Also, every 2 years I have to repair & replace parts for it to pass smog inspection ( a problem since it was new ), no one seems to know how to fix it. I am the original owner. The fuel pump has also been a problem. The airbag light has is also on we no fix. Otherwise the truck drives great and we love it. It is fast & pulls jets or boat easy.
heater core leak
Heater core began to fail causing the windshield to fog and the cab smell of antifreeze. Took to repair shop had heater core replaced.
how to connect to engine of motor
First off, I still haven't fixed the problem. The story is a warning. Started with a foggy passenger side window and only on the right. The thought of replacement was to replace the vehicle but before I was able to sell it, stepson used his car for "texting and missing a deer and then hitting a tree". Needs a car to get to work, you can use the truck 97 Chevy S-10 V-6. "Make sure you check the antifreeze cause it leaks", I warned him. He said there was no heat for a few days and then it overheated. Desperate, he added some window washer fluid to the radiator until he cud add some antifreeze. But it was already too late. During the overheating, the head gasket blew on top of the intake manifold. We bought a $45.00 bottle of sealer and it worked for 3 days before the head gasket blew at the cylinder because I now have white smoke coming from the exhaust.
Have not fixed yet. May try this weekend
keeps over after I had a new water pump and gaskets put on also had new heater core replaced new battery almost damn new have done everything why is it still over heating and losing pressure
Same as everyone else.

Owned GM's for 30 years. Never again.

Never.
Leeking coolant on right side inside of cab
The water heater system has a leak in it. I unhooked it and haven't got it fixed yet. Money is currently tight