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I found a the main ground wire opened from the blower motor and have temporarily tapped into and ran the same size gauge wire to known chase ground to quickly get running... (Florida-heat) Of course this is set to Hi position. I will need a schematic to complete trouble-shooting. Suspect open ground circuit back to motor switch?
check to see if there is a resistor on the blower motor. it should be located either beside or underneath the blower motor.. if that is bad it wont let you select different fan speed settings and if it goes completely out the blower will not work at all.
When engine is hot is the top radiator hose hot also ?
If not install new 195 degree thermostat. Is the blower air hot now ?
If not the heat door may not be opening, or you could have a blown heat gasket.
1st thing to do is change the thermostat. It is either missing, or stuck open (you provide good info). This is why the car is not running at operating temp and why you have little heat. The no blower for settings 1-4 probably means a bad switch.
Check blower fuse, relay and power at blower motor harness terminal. Check for proper grounding at dashboard and body as well. Yo good lucku can run a hot wire to the blower motor and touch it to the connector spade to check if blower itself is OK. There are other components in the system, but this is a good start! Don't forget...fuses blow because there is a problem elsewhere. If you replace one and it blows again, there is something else wrong!
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