Fans not coming on. P1641 P1642
#1
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Fans not coming on. P1641 P1642
So this morning I had my cooling system completely flushed. They used the machine to flush out all the dexcool crap. Used the green stuff to refill, and also replaced the thermostat with a stock one from OReilly's. Well now my heater finally works great.
But now the fans will not come on when the car gets hot. If I turn on the AC or heat/defrost, they will come on. But idling, slow traffic, the car will just keep rising and overheat. Took it to autozone and it is throwing codes 1641 and 1642. Please any help with this matter is greatly appreciated.
But now the fans will not come on when the car gets hot. If I turn on the AC or heat/defrost, they will come on. But idling, slow traffic, the car will just keep rising and overheat. Took it to autozone and it is throwing codes 1641 and 1642. Please any help with this matter is greatly appreciated.
#2
TECH Senior Member
Visit http://shbox.com He has a very detailed overheating diagnosis for the LT1. Those codes are for the relays, but probably good if they're coming on with the AC on. Gotta be something the shop did - air in the system, forgot to connect the sensors, etc.
#6
TECH Senior Member