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A/C Issues
Posted: Sun Jul 08, 2018 11:44 am
by wolfdemon268
Re: A/C Issues
Posted: Mon Jul 09, 2018 7:49 am
by jonnymopar
Check the pressure switches on the refrigerant lines. When the system is charged, the pressure switches should read dead short across the terminals. If they don't, either the system is too low on refrigerant, or the switch itself is bad.
If you don't have a multimeter to check them with, you could also try removing the connector and manually shorting across the wires. This will "tell" the computer that the pressures are correct.
You mentioned that your radiator fan won't kick on. Are you saying that it won't kick on when you manually short the compressor clutch relay?
Re: A/C Issues
Posted: Mon Jul 09, 2018 8:35 am
by occasional demons
IIRC, the fan(s) are not tied to the compressor relay. The PCM uses the high pressure switch as a signal to turn them on. The high pressure switch tells the PCM that the condenser is heating up, and needs cooled. This reduces fan run time in the winter when the defrost is on, or totally eliminates it when the car is moving fast enough.
Fuel economy....
Re: A/C Issues
Posted: Mon Jul 09, 2018 11:13 am
by wolfdemon268
Well ivbe checked for voltage at the connector for the lps and the only way i can get a reading is if i ground the black terminal to the battery, and even then its ony .35v. thats with the connector unplugged from the expansion block and no matter what i do i cannot get the hps connector to plug in all the way, its like theres something blocling it but i have looked and there isnt.
Re: A/C Issues
Posted: Mon Jul 09, 2018 11:20 am
by wolfdemon268
and do II gens have an evaporator temp sensor?
Re: A/C Issues
Posted: Wed Jul 11, 2018 5:25 pm
by wolfdemon268
Cmon guys I'm really at a loss here
Re: A/C Issues
Posted: Thu Jul 12, 2018 7:27 am
by occasional demons
wolfdemon268 wrote: ↑Mon Jul 09, 2018 11:13 am
no matter what i do i cannot get the hps connector to plug in all the way, its like theres something blocling it but i have looked and there isnt.
Until you get the high temp/pressure connector to seat, I doubt it is going to function.
Re: A/C Issues
Posted: Thu Jul 12, 2018 11:26 pm
by wolfdemon268
What about the voltage issue? I only read voltage when I ground straight to battery
Re: A/C Issues
Posted: Fri Jul 13, 2018 8:37 am
by occasional demons
My guess is there is no voltage applied. IIRC,the other end of the wire goes to the PCM, which senses ground, and lets the A/C function. If it doesn't sense ground, it prevents the compressor from running.
They don't wire it up like old school. Everything is a "circuit sense" through the PCM. We has technology, no need for simple wiring.
Re: A/C Issues
Posted: Sun Jul 15, 2018 12:22 pm
by wolfdemon268
So that could still be the system isn't filled properly? And or those sensors are bad?
Re: A/C Issues
Posted: Sun Jul 15, 2018 12:24 pm
by wolfdemon268
Also when I short straight across the connectors nothing happens
Re: A/C Issues
Posted: Thu Jul 19, 2018 11:20 am
by wolfdemon268
Still nothing with the ac
Re: A/C Issues
Posted: Sun Jul 29, 2018 10:35 am
by wolfdemon268
Ok so here's an update, I've got voltage on the ac sense wire coming out of the pcm it also looks like there's voltage at the high pressure cut out switch but not at the low pressure cut out switch. So where do I go from here