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Dorito · 08-30-2022, **(Subject: HVAC AIR COND MICRO RELAY Clicking behind dash. )**

I have a 2016 Peterbilt 389. I’ve replaced the relay. I changed the temperature blender actuator. I put a new belt. I replaced the o rings on the compressor lines.And now a new AC compressor. I also replaced both AC filters and made sure evaporator core was clean. STILL CLICKING!!! Any help would be greatly appreciated! It’s driving me nuts! Lol

Nilao · 08-31-2022, **(Subject: HVAC AIR COND MICRO RELAY Clicking behind dash. )**

That relay is most likely controlled by the body controller. It may need a software update, or it could be sensing some other issue causing it to cycle the relay....you need a shop to hook up ESA and fing out what is causing that issue.

Pete365_Tampa · 09-06-2022, **(Subject: HVAC AIR COND MICRO RELAY Clicking behind dash. )**

(08-30-2022 )Dorito Wrote: I have a 2016 Peterbilt 389. I’ve replaced the relay. I changed the temperature blender actuator. I put a new belt. I replaced the o rings on the compressor lines.And now a new AC compressor. I also replaced both AC filters and made sure evaporator core was clean. STILL CLICKING!!! Any help would be greatly appreciated! It’s driving me nuts! Lol

I have a similar issue with this relay...Did you get this resolved?

tree98 · 09-06-2022, **(Subject: HVAC AIR COND MICRO RELAY Clicking behind dash. )**

I had a relay clicking behind the dash in my western star. It turned out to we a bundle of wires rubbing against the starter finally rubbed through and would intermittently ground out.

Dorito · 07-12-2023, **(Subject: HVAC AIR COND MICRO RELAY Clicking behind dash. )**

(09-06-2022 )Pete365_Tampa Wrote:
(08-30-2022 )Dorito Wrote: I have a 2016 Peterbilt 389. I’ve replaced the relay. I changed the temperature blender actuator. I put a new belt. I replaced the o rings on the compressor lines.And now a new AC compressor. I also replaced both AC filters and made sure evaporator core was clean. STILL CLICKING!!! Any help would be greatly appreciated! It’s driving me nuts! Lol

I have a similar issue with this relay...Did you get this resolved?

Dorito · 07-12-2023, **(Subject: HVAC AIR COND MICRO RELAY Clicking behind dash. )**

(07-12-2023 )Dorito Wrote:
(09-06-2022 )Pete365_Tampa Wrote:
(08-30-2022 )Dorito Wrote: I have a 2016 Peterbilt 389. I’ve replaced the relay. I changed the temperature blender actuator. I put a new belt. I replaced the o rings on the compressor lines.And now a new AC compressor. I also replaced both AC filters and made sure evaporator core was clean. STILL CLICKING!!! Any help would be greatly appreciated! It’s driving me nuts! Lol

I have a similar issue with this relay...Did you get this resolved?