As of lately, like maybe today, I noticed the ac condensor fans are not coming on with the ac. Checked all the temp switches on the thermostat housing and all are plugged in.
Any thoughts?
Wayne
Any thoughts?
Wayne
Condensor Fans
- Thread starter SPD TRP
- Start date
Apply 12v to the fans and make sure they still work. Check the temperature switchs for corosion. I seem to recall that they don't come on immediately after the AC is kicked on, if they're temperature dependent you might not be hitting the correct temperature. Also check your radiator and make sure it's filled to the brim, air pockets could mess with the temperature senders.
Do what he said first. There is a dual pressure switch that should close electrically when the fan needs to come on. If it is defective, a new one is the only fix. Aside from fabrication.
Nick M said:
Acccording to the TRSM--- the dual pressure switch--1 and 2 should be open less than 30 psi or above 384 psi.
Before I got this post, I got my TRSM and made sure the fans are indeed working by going to each relay and "jumping" across it to emulate the relay indeed doing what it is supposed to do. They all were working properly.
So I went further upstream to the dual pressure switch---unplugged it and checked for an open, it was open but the engine was off with the key on and a/c on.
So again further up the circuit I went---jumped this switch and wouldn't you know the fans kicked on. In the morning I will jump this swich again and see if the fans come on with the motor running and a/c on.
Thanks
Wayne
my "fan" (note: I have ONE) Is this normal? Am i supposed to have two? Seems to turn on and off peridocally while driving, like it won't be on, then I stop at a drive thru, and I hear it kick on, then about a minute or two later, it turns off...is this normal??
johnathan1 said:
I have heard that some of the ealier models only had one condensor fan.
Mine has two small condensor fans and one large fan in front of the radiator because is was an automatic. It is my understanding that these fans help cool the freon when stopped at a light or in moderate traffic.
Wayne
N
NDBoost
Guest
if you take the wire for the ac condensor fan sensor and connect it to a chassis ground. Anytime the car is in Keyon position the fans will run.
IE: a continous running Electric fan
IE: a continous running Electric fan
wait a minute...i am talking about the little fan that is next to the huge belt-driven fan...the one attached to the top right corner of the radiator, my condensor (in front of the radiator, right?) has no fans on it at all.
N
NDBoost
Guest
IIRC 89+ had the dual AC Condensor fans & the lower AC fan between the IC and Radiator.
pret 89 had just a single AC Condesnor fan didnt they? Either way if you take the wire off of the thermostat housing and ground it out you will get all electric fans to turn on the entire time the car is on Keyon position.
pret 89 had just a single AC Condesnor fan didnt they? Either way if you take the wire off of the thermostat housing and ground it out you will get all electric fans to turn on the entire time the car is on Keyon position.
3rdtimearound said:
I made a mistake--its not the dual pressure switch but the high pressure switch that controls the condensor fans.
Me said:
Dual pressure switch is the power to the compressor, not the fans. The other switch inline with it is the high pressure switch.
'89 N/A. no fan out in front of radiator. 2 little electric that only work when a/c 'high side' pressure gets up to a certain point. Usually not on when cruising at hwy speeds, as enough air passing by cools the condensor.
On the passenger side of engine compartment, along the frame, out from the oil filter, are 2 sensors in the small 'high side' line.
One (closest to firewall) is normally open, then closes when pressure comes up, to complete the fan circuit, thus allowing the fans relays to operate the fans. . If this switch goes bad, you can put a jumper in the connector to by-pass it. The fans will always be on when the a/c is on. Better that than not on.
The other one (closest to radiator) is a 'high pressure safety' switch. It is normally closed. It will cut the power to the compressor if the line pressure goes too high. This is to help save the compressor. It operates (opens) at approx. 325 psi.
Those little fans pull a LOT of air. I put a switch in the dash, in place of one of the coin holders, to turn them on when I want. The switch grounds the 2 relays.:biglaugh:
On the passenger side of engine compartment, along the frame, out from the oil filter, are 2 sensors in the small 'high side' line.
One (closest to firewall) is normally open, then closes when pressure comes up, to complete the fan circuit, thus allowing the fans relays to operate the fans. . If this switch goes bad, you can put a jumper in the connector to by-pass it. The fans will always be on when the a/c is on. Better that than not on.
The other one (closest to radiator) is a 'high pressure safety' switch. It is normally closed. It will cut the power to the compressor if the line pressure goes too high. This is to help save the compressor. It operates (opens) at approx. 325 psi.
Those little fans pull a LOT of air. I put a switch in the dash, in place of one of the coin holders, to turn them on when I want. The switch grounds the 2 relays.:biglaugh:
mrnickleye said:
My fans stay on with the high pressure swicth jumped as long as the key is on wether or not the a/c is on or not.
Wayne