if the fittings aren't different sizes to help you out, it will be the fitting furthest from the frame, closest to the rad. or engine. all gm trucks are like this.

Anonymous

405 Answers
Posted on Dec 27, 2008

SOURCE: Heater wont work in my 1990 Chevy Truck

Several things can cause this (1) low coolant (2) bad coolant valve to heater core.(3) bad damper in duct.

Anonymous

69 Answers
Posted on Apr 09, 2009

SOURCE: 1990 CHEVROLET K1500 350 MISSES AFTER WARM

My first thought for a solution of your problem is plug wires. You have replaced some common problem areas for this situation but the plug wires are the most susceptible for causing a miss after engine is warmed up. Try replacing the spark plug wires and let me know what happens.

Lefty64

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