where is the a/c relay located at on a 94 850. my air stoped working the other day. i jumped the low pressure switch out still nothing. the fuze is still good. but the compresser is not coming on or the blower motor. please help me

 

So I have this right the blower and the compressor doesn't come on?

The relay only controls the compressor.
The blower is on a different circuit.

Might be a bad A/C module.

 

ok the blower is working but the compresser is still not kicking in.

 

Do you have power to the low pressure switch?

 

Start trouble-shooting your AC compressor problem right here...

https://volvoforums.com/m_30486/tm.htm

 

no power at the pressure switch

 

Do you have ECC or MCC?

 

how would i tell if it was manual or Electronic?

 

Ecc is electronic climate control. The temp dial has Numbers on it. Also it will have AUT on the temp, and fan switch.

 

ok then it is mcc. i really need to know where this relay is please

 

It will be in either of the 2 places. The Main relay box under the hood or you will have to remove the fuse box cover and look under there.
Here is a link for a site that has a wiring diagram you can look at to help you back track from the low pressure switch and find the problem.
http://www.volvotechinfo.com/WD123/

 

ok it was not the relay. i changed both of them. the compresser is still not coming on. if i jump the comp to the batt. the clutch will ingauge. what elsa to look at?

 

and it has mcc

 

and i have like 8.7v at the pressure switch

 

Do you have any codes in the engine control module?

 

no i dont have any codes in the ecm

 

HMMM check and follow the wiring diagram.
It is hard to tell you much more without seeing the car.

I have run out of Ideas.

All that I have posted comes from all that I have seen wrong.