Having problems with your Geo Spectrum ?
Have 1989 geo spectrum,fan not running,but disconnected run hot it works,pulled relay condensor fan relay gm94109148 what other parts I can ck to cause fan not to work.
The coolant temp sensor
I am having the same issue with my '89 Spectrum. However, I lost the heater fan, gauges, and dummy lights at the same time. All fuses are good. (?) Did you have any success replacing the thermostat?
Repair Help & Product Troubleshooting for Geo Spectrum
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