Not sure which 1999 GMC Sonoma Thermostats are right for you? We have over 14 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"Vehicle seems to run cooler during normal driving conditions. When running my AC unit my vehicle still heats up especially when outside temp is above 85f." —Brandon L from Boise, ID bought a Hypertech Power Stat Thermostat for a 1999 GMC Sonoma, 4.3L V6.