The stock radiater in my C190 1.9 Diesel Luv is a 3 core with fat top and bottom tanks, If i was in your shoes Eric i would fit an aftermarket 3 core alloy rad. like the v8 guys. My trucks needle sits in the same position on the gauge no matter what time of year or how much im towing or have loaded on the back.

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1980 4x4 KBD40 ISUZU/Chev Luv
Factory Fitted c190 Diesel Engine, ARB BullBar, Ramsey Winch, Custom Tilt Tray,

LUVTRKR wrote:
It does have a license plate so technically it is a street truck, that sets off car alarms and makes kids cry. lol