pifo1964

Hi
I´m wondering if when I turn on the AC, the secondary fan, like the primary, MUST turn on.
It is a 93 with electronic AC which works very well, either cold or warm.
As the car doesn´t has temperature issues, the secodary fan never turns on, but I know the electric motor works because i forced a trouble code disconnecting the MAF sensor and saw the two fans working together.
If the fan must turn on with the AC, where can i look to find the problem?
thanks in advance

pifo1964

Anyone?

s carter

I took a look in the 93 service manual and it tells the secondary fan is controlled by the ECM and is activated when. the following occur

A/C sends high pressure signal
when any ECM diagnostic code is set
ECT above 234deg F
engine oil temp. 235deg F

this is a revision post

pifo1964

thanks!
yes, i mean that fan, the one on passengers side.
225 psi on A/C head, is an issue?
what is ECT?
Sorry, but i´m new with Corvettes and english it´s not mt language, therefore at the moment i´m not familiar with certain terms and abbreviations.

s carter

E-C-T = Engine Coolant Temp

pifo1964

it´s logical, i should have reasoned a little more....
thanks!

s carter

stand by one second I have a revision on previous temps and stuff temps are out updating now


Secondary fan will run when

ECM has trouble codes (DTCs)14,15,52, or 62 (DTC= diagnostic trouble code)

ECT above 234deg. F

Engine above 235deg F

A/C high pressure switch signal from A/C fan switch

the earlier numbers bugged me and rite now I don't see were they came from, these numbers are post lunch not pre breakfast

pifo1964

thanks again
so, for what i understood, if everything works as it should, the secondary fan should not turn on by simply connecting A/C?

s carter

that's the way I read it too

not until car starts getting hot and a/c gets a higher pressure than it likes