First you must figure out electrical wiring digrum of the blower motor circuit. Check FSR fuse which is inside the passenger side (Right hand drive) of the g 20 lovely c6 corvette wiring diagramRadiator fan diagram C4 corvette q&a: starter relay, cooling fan relay, wiring diagramCorvette cooling. 1989 corvette heater wiring schematicC2 heater blower connections Wiring schematic request for dual fan upgradeBlower motor with a/c wiring diagram. Check Details. Corvetteforum corvette. Fan ac working c4 Engines used in BMW E90 automatic transmission models hold about 8.2 liters of coolant, manual transmission models hold 8.4 liters. In this article, I'll go over the steps involved with replacing the engine coolant on the BMW E90 models. Be sure to work with a cool engine and confirm the cooling system lacks pressure before opening cooling system. Radiator outlet temperature. Catalyst temperature (calculated. temperature) Vehicle speed. Battery voltage. A/C pressure (calculated pressure) To troubleshoot: check computer for any set codes. unplug the fan connector and test for voltage on the two large wires. My FSR finally gave in at 15y/140K, so I took the opportunity to take some photos for those who need to trouble-shooting HVAC Blower Motor and FSR circuit. In 90% of the cases, the FSR fails. In 10% of the cases, the HVAC panel fails. There are 2 ways an FSR can fail: 1. Not working at all (this is my case) 2. The only thing that changes the temperature at vent level seems to be outside temperature. This morning it was 30F outside, driver vent blew some warm air but passenger vent blew cold. This afternoon while it was 54F out both blew warm while on interstate. Last week when it was 20F both blew cold. Join Date: Dec 2013. Location: Poland. iTrader: ( 1) your second and last errors may mean that you have or had indepedent heating option (webasto) and with it you may had water valve but now you do not have it. so you'll need either to check if you have webasto and its working or code out this option from ihka. Easiest thing to check is fuse first. Then the final stage resistor and the blower motor. There was a service bulletin out for the blower motor burning out due to leaking cowl cover but unless you have water on your pass side floor then I would rule out the leak. pPLGOD.