Hey i have a problem with a D15B engine somehow the **** overheats when i install a Thermostat but when no thermostat is present it doesnt heat i mean what gives? With thermo cant drive past 2 blocks and w/o thermo i drove car for 30min to a 1hr with ni prob.! Could there be a special thermo for this engine or is it my thermohousing with the coolant tube that goes in back of block diffirent!!!?? Any input is greatly appr.