New Low Pressure Switch, Working Air Conditioning!

The air conditioning had not worked in several years. Around 2011, I replaced all the hoses and had the system charged with R12 which worked well for several years. Over the past few years, it would work intermittently for awhile, then failed altogether. I had tried troubleshooting it, and thought the refrigerant was leaking and possibly low. I borrowed AC gauges and checked pressures. Tracing the circuit lead me to the low pressure switch. When I shorted it, the compressor would start. The switch looked like it needed to be replaced. I purchased a new switch:

After some more troubleshooting, and some help from Delorean Midwest, the replacement switch worked!

Costs:

ItemPurchase DateVendorQuantityCost Shipping Tax Total
Low Pressure Switch6/28/2023Delorean Midwest1 $  11.57 $              –    $  11.57
O Ring6/28/2023Delorean Midwest1 $    0.29 $              –    $    0.29
 $  0.92 $  12.78

New Blower Motor

My blower motor was horrendously loud and didn’t always work on the low speed. It also has lots of corrosion in it. I bought a replacement, and finally found time to install it. I’m happy to report the new motor is quieter and works on all speeds.

Tools used:

  • Short ratcheting driver
  • 9/32 bit

Removing the old fan:


found a stray locking nut:

Corrosion:

New, installed:

Costs:

Item Purchase Date Vendor

Unit Cost

Cost

Shipping

Tax

Total

Four Seasons/Trumark 35582 Blower Motor without Wheel

10/24/2018

Amazon.com $ 33.64 $ 33.64 $ – $ 2.10 $ 35.74