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 Blazer Heater Core Under Right Side of Dashboard May Leak Engine Coolant
Chevrolet S10 Blazer Problem
Average Mileage: 120,594 mi (53,000 mi - 200,000 mi)
Visitor, 1992 Chevrolet S10 Blazer, 60,000 mi
Replaced the heater core and installed a ground wire from the heater core to the chassis ground. Blazer now has 247000 miles and haven't replaced the heater core or the radiator since. Electrolysis is a terrible thing.
Visitor, 1994 Chevrolet S10 Blazer
Core leak "fixed " by disconnect of hoses to fire wall w/caps, as i live in Fl.
Visitor, 1992 Chevrolet S10 Blazer, 53,000 mi
heater core started leaking on right front carpet; tied off hoses,plugged one with wooden dowl and clamp.have been driving w/o heater....during tolerable winter conditions~~~~~~~`
Visitor, 1990 Chevrolet S10 Blazer, 109,000 mi
Coolant Leak at passenger side foot area. has to replace heater core
Visitor, 1991 Chevrolet S10 Blazer, 200,000 mi
No Heat - Large puddle in the passenger side floor.
Visitor, 1991 Chevrolet S10 Blazer, 199,564 mi
Heater core went out and antifreeze leaked in the passenger side floor board. A new heater core had to be installed