How does my vehicle’s AC system work?

The AC compressor pressurizes refrigerant gas, which moves to the condenser. The gas releases heat, condensing into a high-pressure liquid. After cooling, the liquid passes over evaporator coils to cool the air as it is blown through the vents.

What are the signs the system needs service?

Common indicators of an air conditioning system in need of service include warm and/or weak airflow through the vents, frequent on/off cycling of the system and a strange or musty odor.

Is the puddle of water under my car a sign of AC problems?

Not necessarily. Condensation typically builds up on the AC evaporator and the water is drained at the bottom of the vehicle. That’s normal, but a larger puddle combined with reduced AC performance could indicate a problem.

Does low refrigerant mean there’s a leak in the system?

In most cases the answer is yes. AC systems in older cars will experience refrigerant leakage over time, but a later-model vehicle that needs continual refrigerant recharging typically indicates a leak.

Can a new cabin air filter improve AC performance?

Yes. A very dirty or clogged cabin air filter can reduce the airflow of the AC system, reducing its cooling efficiency and making the system work harder than normal. Periodic cabin filter replacements help the AC system keep its cool.

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ACDelco GM Original Equipment 15-72735 (10308119) Heating and Air Conditioning Control Panel with Rear Window Defogger Switch

Product ID: 82555474

Details

Brand
ACDelco
Circuit Type
1-way
Connector Type
Screw
Contact Type
Normally Open
Item dimensions L x W x H
12.75 x 4.5 x
Material
Plastic

🔥Reliable heating & cooling control

⚙️Precision GM OE fit

🛡️Durable IP67 protection

Description

🔥 Upgrade your ride’s climate control — because comfort is non-negotiable!

COMPACT LIGHTWEIGHT DESIGN - At just 11.4 ounces and sleek dimensions, it fits perfectly without adding bulk to your dashboard.
BUILT TO LAST WITH IP 67 RATING - Engineered for durability and protection against dust and water, ensuring long-lasting performance.
MANUAL OPERATION WITH TOUCH CONTROL - Effortlessly manage blower fan, blend, mode, and recirculation settings with intuitive push-button control.
SEAMLESS GM RECOMMENDED REPLACEMENT - Restore your vehicle’s HVAC controls with exact OEM specifications for flawless fit and function.
INTEGRATED REAR WINDOW DEFOGGER SWITCH - Stay safe and clear-headed with built-in defogger control for enhanced visibility in any weather.

The ACDelco GM Original Equipment 15-72735 HVAC Control Panel is a GM-recommended, factory-spec replacement designed to restore full heating, cooling, and rear defogger functionality in your GM vehicle. Featuring manual push-button operation, IP67-rated durability, and precise OEM fit, it ensures reliable, long-lasting climate control performance that keeps you comfortable and safe on the road.

Specifications

ASIN	B000C9CC3M
Actuator Type	Push Button
Best Sellers Rank	#3,661,334 in Automotive ( See Top 100 in Automotive ) #851 in Automotive Replacement Air Conditioning Assemblies
Brand	ACDelco
Brand Name	ACDelco
Circuit Type	1-way
Color	Black
Compatible Devices	GM Vehicles
Compatible with Vehicle Type	General Motors vehicles
Connector Type	Screw
Contact Material	Copper
Contact Type	Normally Open
Control Method	Touch
Control Type	Basic Control
Controller Type	Vehicle HVAC Controller
Customer Reviews	4.2 out of 5 stars 13 Reviews
Global Trade Identification Number	00021625429830
International Protection Rating	IP67
Item Dimensions	12.75 x 4.5 x 4.38 inches
Item Weight	11.36 ounces
Manufacturer	ACDelco
Material Type	Plastic
Model	15-72735
Mounting Type	Panel Mount
Number of Items	1
Operation Mode	manual
Part Number	15-72735
Smart Home Compatibility	Not Smart Home Compatible
Switch Type	Push Button
Terminal	Screw
UPC	021625429830
Unit Count	1.0 Count
Warranty Description	24 Month / Unlimited Mile Limited Warranty on parts sold on or after 04/01/18. (Parts Only) Please see ACDelco.com for more details.

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