Car Problem Reports

Chevrolet S10 Heater Core Under Right Side of Dashboard May Leak Engine Coolant

Chevrolet S10 Problem
42 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2001

Average Mileage: 145,096 mi (63,600 mi - 270,000 mi)


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.

  • Visitor, , 254,000 mi

    replaced heater core

    Flag This
  •  Enthusiast

    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.

    Flag This
  • Visitor, , 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.

    Flag This
  •  Rookie

    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.

    Flag This
  • Visitor, , 63,600 mi

    replace heater core

    Flag This
  • Windows. Fog up

    Flag This
  • Visitor, , 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.

    Flag This
  •  Rookie

    need to replace heater core some have said this model you dont have to remove entire dash

    Flag This
  • Visitor, , 174,000 mi

    Fogged cab and major leakage into passenger side

    Flag This
  • Visitor, , 130,000 mi

    Have not fixed yet. May try this weekend

    Flag This
+ See more reports
Ask a Question