I'm new to the Duramax. I recently bought an LB7 and everything worked great! I've made a few little changes and I had no complaints until last night. My heat decided to start blowing out cold air. I checked all my hoses and they were all warm after a little drive, engine temp gauge is still working which tells me it couldn't be the thermostat, I pulled an HVAC fuse to see what happened and still no change. Can someone help me please? It's snowing outside and I'm not in the mood to have no heat.

 

i just had a buddys LLY do the same thing put two new thermostats in as good as new

 

Thanks for the reply! I'll give it and see what happens. If it doesn't work you'll be hearing from me pretty soon haha.

 

good luck man heres what we used on my LB7

Merchant Automotive - Thermostat- Front Duramax 185 degree
Merchant Automotive - Thermostat - Rear Duramax 180 degree
Merchant Automotive - Thermostat Housing Gasket