Probably plugged or failed expansion valve on rear evaporator. Both front and rear are plumbed in parallel so if the front is cold, a problem with refrigerant flow at back unit almost has to be in the expansion valve.
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Generally you would need to check the level of freon in the system, and probably the expansion valve in the rear unit. You should have one hot and one cold ac line going to each evaporator.
No ,there is not another valve . One low side service port an one high side service port . An only one A/C compressor . Under the hood in the engine compartment there are A/C lines going into the firewall . These go to the front Evaparator unit . With the vehicle running an A/C on do this line's (pipes) get cold ? If yes , your problem is probably the temp. actuator . Control's how hot or cold the air coming from the vent's get . If stuck half way , hot an cold air combine to make warm air . Replacing some of these actuators can require the dash to be removed . Your best bet ,take it to a qualified repair shop .
I had same issue. I thought it was a fuel delivery problem but I then noticed that while I had it on a battery charger it started up immediately. I noticed that the speed of the starter/flywheel was significantly quicker leading to the conclusion that the battery just needs to have more cranking amps. When I told this to a mechanic friend of mine he told me that it had something to do with the computer and that I just needed a better battery, more cranking amps. I just bought a battery today might even get a bigger one
Sometimes it may take a while.Make sure he is keeping pressure on the pedal while u are loosining the bleeder screw.U can loosen all and let gravity take over for a while but it takes some time.
Inside the van, all the way to the rear, on the side, will have a nice looking panel over it, remove panel and you'll see blower motor, held on with about 6 small screw's.
often on the vans with rear air the air dor acuator goed bad and can no longer switch from hot to cold. also the swich itself will often go bad. this can be caused by sticky fingers damaging the inside of the switch. sometimes a good cleaning in warm water will fix a sticky switch
The car uses the same freon in the front as it does in the rear. If the rear a/c is working, you either have a plugged evaporator in the front unit, or perhaps a bad heater switch. Try switching the heater to hot and see if it blows even warmer air from the front vents. If so, the heater switch is working and then it sounds like a plugged evaporator or maybe a plugged orifice tube. That is a good place to start looking. Hope this helps.
Sometimes there is a valve on the right upper part of the doghouse if you are facing front. With hood popped look for a wing -nut looking valve. Test it a little and make sure its the right one before driving anywhere. Hope this helps.
Most gas injected engines run at a higher speed when started from cold....It's the cold start application working....As long as the idle speed returns to normal within a minute or two....longer when the weather is colder.....nothing to worry about
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