A/C not blowing cold air

Tiny
PITT8ULL
  • MEMBER
  • 1998 BUICK PARK AVENUE
  • 3.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 184,000 MILES
My A/C blower motor works but it only blows from the defrost vents an it only blows hot air never switches to cold, yes the coolant is full.
Monday, July 5th, 2021 AT 4:13 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Sounds like you may have two issues. The defrost issue is the mode door actuator not changing the position. This is a default when it fails so that you always have the ability to defrost the window or it could be a safety issue.

Here is a guide that will help wit this info:

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Next is a possible blend door issue. Basically this is responsible for changing the temp of the air by routing it over the heater core for heat and then diverting so it does not go over the heater core when you want A/C.

Here is a guide for this issue:

https://www.2carpros.com/articles/replace-blend-door-motor

Below you will find the process for this. There is a chance that the heat issue is a weak A/C system so we should check the pressures before we replace the actuators just to be sure it is okay.

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Let me know what questions you have and we can go from there. Thanks
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Tuesday, July 6th, 2021 AT 3:36 PM

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