Category Archives: Heat & Air Conditioning

How to change car air conditioning valve core (Schrader valve)

Valve core replacement toolI recently purchased a used car. The only problem it had was that the air conditioning did not work – it would only blow warm air. After recharging the A/C system (see that blog post here: mike-thomson.com/blog/?p=1240), I could see that the Schrader valve core on the air conditioning low side port was leaking very badly. This blog post describes how to replace the Schrader valve core without losing your A/C system charge in the process. My car is a 1998 Saturn SL2, but this repair can be used as a reference for most vehicles. Continue reading How to change car air conditioning valve core (Schrader valve)

How to recharge car air conditioning and find leaks

R-134a rechargeAfter purchasing a used 1998 Saturn SL2, I needed to recharge the air conditioning system with R134a refrigerant because the A/C would only blow warm air. This blog post describes how to recharge your vehicle’s air conditioner, and the instructions here are general enough that they will apply to practically all vehicle makes and models. If you find yourself needing to replace your A/C system’s valve core (Schrader valve), then see my other blog post describing how to do that: mike-thomson.com/blog/?p=1234. Continue reading How to recharge car air conditioning and find leaks