Forum » General Tuning Discussion » Aircon control - haltech basemap - haltech uses on/off switch and compressor output - what i/o is actually used by the oem ecu and how?

Aircon control - haltech basemap - haltech uses on/off switch and compressor output - what i/o is actually used by the oem ecu and how?

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Weird thought i had the other day (triggered by lack of knowledge around car aircon systems and a desire to know "what if...")

I have the honda k20 engine running haltech elite using the adapter loom. all good there.

It has an aircon button input, aircon compressor output setup mapped from factory wiring through to the haltech ecu. all good there.

its also got aircon pressure and aircon temp inputs not setup in the haltech and i dunno if the factory ecu uses them even.

Is it safe to

a) turn on aircon even if the car air vent fans are turned off - does aircon need airflow to stay working happily or will it ignore airflow - or will it get damaged if there is no airflow over the aircon core?

b) leave the aircon turned on for a loooong drive - say in theory you had to cover 2000km constant cruise in the band the haltech will enable the aircon compressor output in. Will having aircon run by haltech be any different to aircon run by the factory ecu?

I want to avoid doing anything that may cause either a thermal or pressure limit to be breached and cause damage.

Thankfully its coming up to winter here in NZ so I'm not too fussed about this for the next say 6 months as aircon would only ever be used to clear the windscreen for a few mins at a time.

In short - can anyone offer a solid theory about this - or results from practical experience with aftermarket ecu's and aircon systems or knowledge around car aircon systems on/off switching?

I dont want to pull the aircon - it works perfectly with the factory ecu - i just dont want to use it if its not under proper control and will happily live without if the haltech is not suitable for controlling things. If i trigger the aircon via haltech - it does work - i just want to make sure its not going to run when it shouldn't due to temp / pressure / timer issues.

its a road car not race car otherwise it would be weight saving time due to removal of the aircon system :)

Weird thought i had the other day (triggered by lack of knowledge around car aircon systems and a desire to know "what if...")

I have the honda k20 engine running haltech elite using the adapter loom. all good there.

It has an aircon button input, aircon compressor output setup mapped from factory wiring through to the haltech ecu. all good there.

its also got aircon pressure and aircon temp inputs not set up in the haltech and i dunno if the factory ECU uses them even.

Is it safe to

a) turn on aircon even if the car air vent fans are turned off - does aircon need airflow to stay working happily or will it ignore airflow - or will it get damaged if there is no airflow over the aircon core? it will be fine you should have a fan that cools the aircon radiator controlled by the ECU

b) leave the aircon turned on for a long drive - say in theory you had to cover 2000km constant cruise in the band the haltech will enable the aircon compressor output in. Will having aircon run by haltech be any different to aircon run by the factory ecu?

the air con will run long distance no issue just like factory

Thanks heaps Ross - i feel happier now wiring that bit in :) cheers