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Possible the headlight/dimmer switch is bad. Should be part of the turn signal switch assembly. Try moving the switch back and forth many times to see if the connection is bad.
The average cost for a Buick Rainier air pump replacement is between $469 and $572. Labor costs are estimated between $61 and $78 while parts are priced between $408 and $494. Estimate does not include taxes and fees.
The secondary air injection pump relay is under the hood in the fuse and relay center, it is worth a try and it is very likely the pump relay is he cause. The fuse and relays and their function are shown on a sticker under the lid of the box.
RELAY RELAY RELAY. Known issue for years, there is a recall for this issue. Quick fix is to swap #43 with #46 relay or replace your own relay. I keep a spare in my glovebox. GM has just released a permanent fix for this problem, like a month ago.
This is just an idea, but if the a/c is working good, it may be the relay that changes your heater from hot to cold....give it a shot..just an idea....Please leave a good ratin, it is very important to me...
relay #41 under hood fuse box
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