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Originally Posted by mkinnear
Hope it's not too late to reply; had same problem with 98 Regal, I replaced $250 dash control module that contains all the heat / ac controls and also the $20 temp control relay located under the dash, both parts did not correct the problem. Took car to Buick dealer; they determined ignition switch was the problem, it had an intermittent short. They replaced switch for $300 and car is working fine.
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Jerrygoodwrench. Had the same exact problem and found the ign switch to be the problem..Changed it myself but is was no fun what-so-ever. The new switch was 116.00 at the dealer.. Good luck.