I have an issue that I could use some help with. Two years ago I did a major upgrade on my 1997 K1500 Suburban. I installed an new L31HD Crate engine. Along with the new engine I did a 0411 PCM Swap, added Electric Fans from a 2005 Suburban Z71 and add a big block radiator. The engine runs VERY cool in the summer. I also put a new dash board in and while I had the dashboard out I installed a new heater core.
The last two winters I have had no heat. I installed a 185 degree thermostat in the vehicle. I have checked both heater hoses and they are hot. I put a piece of wood between the condensor and radiator last night and the coolan temp got up to 210 degrees this morning still no heat. Today the outside temp was 8 degrees and I had the cooling fans disabled. Last week I pulled the dash and checked all the actuators and they all seem to be working. I pulled the blower motor and vaccumed out some debris from in front of the heater core. After I put everything back together I started the truck and let it run for about twenty mins and I had good heat. Until I took it for a drive and with air blowing over radiator it cooled down. Not really sure where to go from here. Anyone have any ideas?
The last two winters I have had no heat. I installed a 185 degree thermostat in the vehicle. I have checked both heater hoses and they are hot. I put a piece of wood between the condensor and radiator last night and the coolan temp got up to 210 degrees this morning still no heat. Today the outside temp was 8 degrees and I had the cooling fans disabled. Last week I pulled the dash and checked all the actuators and they all seem to be working. I pulled the blower motor and vaccumed out some debris from in front of the heater core. After I put everything back together I started the truck and let it run for about twenty mins and I had good heat. Until I took it for a drive and with air blowing over radiator it cooled down. Not really sure where to go from here. Anyone have any ideas?