Toyota Sienna Forum - siennachat.com banner

a/c problem

17K views 15 replies 10 participants last post by  rhall8068  
#1 ·
I have a 2000 Sienna XLE. AC isn't working. Light comes on but compressor isn't running. I'd like to crosswire the clutch relay recepticle to verify that the clutch and compressor are working and recharge the system but I can't find the compressor clutch relay. I've seen multiple threads about a MC CLT relay in the engine compartment fusebox but it's not there on this year vehicle. The owner's manual indicates that there are two fuseholders under the steering column dash, but I can't identify anything that I recognize as a fusebox or relay.

There have also been some threads that refer to "manual a/c" versus "climate control" or something to that effect. Although I'm not familiar with those terms, I assume there are different wiring schematics associated with the different systems. I don't want to put a lot of extraneous information here, but will also mention that the sensor on the high pressure AC line is a three-wire sensor. Some threads have suggested that crosswiring the compressor clutch relay recepticle is OK for a two wire pressure sensor system, but not OK for a three wire sensor.

Locating the compressor clutch relay so I can turn on the compressor and recharge the system is my first and main objective. Thanks for any help you can give me.
 
Discussion starter · #3 ·
Thanks JC. Unfortunately I don't have a manifold gauge set to check pressure on the high pressure side. (I can use my hose and gauge that recharges R134 into the low pressure side to check the pressure there.) I've already assumed that the most likely problem is low refrigerant. But to recharge the system I need the compressor running. The compressor doesn't run if the refrigerant is low. That sensor-detected cutoff protects the compressor. So I want to bypass the sensor and make the compressor run so I recharge the system. I'll do this with refrigerant that has an indicator dye to help identify any leak. This strategy also reassures me that the compressor and clutch are actually working by taking the sensor out of the picture. Yes, you sure wouldn't want the compressor to run for any significant length of time without refrigerant, but the only way I have to recharge the refrigerant is to have the compressor running.
 
Discussion starter · #5 ·
Thanks JC. Anybody know the electrical setup for the 2000 Sienna airconditioner? I'm looking for the air conditioning compressor clutch relay. In some models it's located in the engine compartment fusebox. Not in the 2000. Appreciate any help from those of you who are familiar with the air conditioning system in this model/year. Thanks.
 
Discussion starter · #7 ·
JC, do you know where the compressor clutch relay is located on your Sienna? Do you know how to override the sensor to make the compressor run when the refrigerant is low?
(In your last post, are you talking about sending me a link to buy the shop manual? I'm hoping to find someone who knows the answers to these two questions without buying the shop manual but I appreciate your help.)