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<blockquote data-quote="LARRY70GS" data-source="post: 374238" data-attributes="member: 726">First, go over to <a href="https://www.v8buick.com/index.php">V8buick.com</a> and join.&nbsp; That site is the best for your car hands down.You need to buy a Chassis Manual for your car.&nbsp; They are widely available.&nbsp; You can usually find them on E bay for cheap.[URL unfurl=&quot;true&quot;]https://www.ebay.com/itm/Genuine-OEM-1972-Buick-Chassis-Service-Manual-All-Series-Original-Authorized/133604940872?hash=item1f1b799c48:g:d40AAOSwwMJf1Y6E[/URL]There is only one high speed relay located on the firewall, behind the air cleaner.&nbsp; If that relay was bad, you would only have lower blower speeds, but not max blower speed.&nbsp; The blower resistor screws into the A/C housing in the engine compartment.&nbsp; The blower motor is under the fender.&nbsp; To replace it, you'll need to remove the fender, not an easy job.&nbsp; Trouble shoot everything else before you do that.</blockquote>

[QUOTE="LARRY70GS, post: 374238, member: 726"] First, go over to [URL="https://www.v8buick.com/index.php"]V8buick.com[/URL] and join. That site is the best for your car hands down. You need to buy a Chassis Manual for your car. They are widely available. You can usually find them on E bay for cheap. [URL unfurl="true"]https://www.ebay.com/itm/Genuine-OEM-1972-Buick-Chassis-Service-Manual-All-Series-Original-Authorized/133604940872?hash=item1f1b799c48:g:d40AAOSwwMJf1Y6E[/URL] There is only one high speed relay located on the firewall, behind the air cleaner. If that relay was bad, you would only have lower blower speeds, but not max blower speed. The blower resistor screws into the A/C housing in the engine compartment. The blower motor is under the fender. To replace it, you'll need to remove the fender, not an easy job. Trouble shoot everything else before you do that. [/QUOTE]

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