Tejas, I drove a 1990 DC for 13 years and had thermostat problems on about the 8 th year. Went through 3 of them before I got one that worked. I purchased mine through NAPA and they did back them up. Unfortunately, the one I left in the truck had a wide swing, from cold to the top of the "safe" line. I guess I just got tired of putting the darn things in! I think you could say I never did find a good one like the OEM.