Replaced the pitman and idler arms due to loose steering.
Replaced positive battery cable.
Replaced driver side power window motor.
Replaced fuel pump and filter.
Replaced passenger side seat adjuster handle.
All four disk brakes thoroughly serviced and pads replaced.
Air conditioner serviced and compressor seals replaced.
Replaced serpentine belt.
Wiper speed control modulator fails often. Soon to be replaced.
Must refill water coolant reservoir monthly.
There is a persistent unknown knocking noise beneath the dash or on the other side of the engine firewall.
I bought this S10 Blazer just 2 months and 2,000 miles out of warranty and spent over $1,200 on noted repairs within 45 days of purchase.
I like this vehicle and have invested in a trailer hitch and mud flaps for show. Unfortunately, it's resale value bottomed out and I can't recover my loan even if I wanted to sell it.
The knocking on the other side of the firewall is most likely your heater core.