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.Google+
Car Problem Reports
Chevrolet S10 Heater Core Under Right Side of Dashboard May Leak Engine Coolant
Chevrolet S10 Problem
Average Mileage: 145,096 mi (63,600 mi - 270,000 mi)
Visitor, 1990 Chevrolet S10, 254,000 mi
replaced heater core
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.
Visitor, 1995 Chevrolet S10, 100,000 mi
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.
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.
Visitor, 1992 Chevrolet S10, 63,600 mi
replace heater core
Visitor, 1996 Chevrolet S10
Windows. Fog up
Visitor, 1995 Chevrolet S10, 132,000 mi
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.
need to replace heater core some have said this model you dont have to remove entire dash
Visitor, 1991 Chevrolet S10, 174,000 mi
Fogged cab and major leakage into passenger side
Visitor, 1997 Chevrolet S10, 130,000 mi
Have not fixed yet. May try this weekend