Noticed my 94 Z34 has a warming issue. Wont climb over 135 degrees and when you open the valve on the top hose to "burp" the system nothing at all comes out. First of all do these 3.4 DOHC engines have 2 thermostats? Ive noticed what appears to be a second thrmostat housing right behind the fans on the lower side of the engine. Only thing else I can think of is the water pumps not circulating but I dont hear any odd noises and the pulley turns...