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Replaced cycling switch. What temp do you have at the vent?
1st Gen. Ram - All TopicsDiscussion for all Dodge Rams prior to 1994. This includes engine, drivetrain and non-drivetrain discussions. Anything prior to 1994 should go in here.
Have less grease would have the same effect as pulling the probe out. So the compressor would run longer before switching off.
I'm going to check my charge. Like one of the posters mentioned.
I don't know if less grease would have that effect or not. What I wonder about is the age and condition of the grease. All I did with mine was moved id in and out just a little, I really was just looking for obvious reasons it wasn't working, causing it to start working was just a side effect
Mine wouldn't shut off and the condenser froze up. Yeah, check the charge first. That is what I first thought was wrong with mine.It had a full charge but wouldn't cool.
Another thing to check is the pressure switch in the expansion valve.
so to chime in to what was already said I used propane/butane mixture. To keep the head pressures somewhat within spec to what r12 is. previously used something called Freeze 12 which was close to the r12 but I do believe it too was also a hybrid mixture.
I feel that the propane butane mix really operated much more efficiently than the freeze 12 or the 134a that I've retrofitted in the past. I guess it all comes down to your comfort level.
so to chime in to what was already said I used propane/butane mixture. To keep the head pressures somewhat within spec to what r12 is. previously used something called Freeze 12 which was close to the r12 but I do believe it too was also a hybrid mixture.
I feel that the propane butane mix really operated much more efficiently than the freeze 12 or the 134a that I've retrofitted in the past. I guess it all comes down to your comfort level.
I agree with this. The 134a freezes me, but I shiver at 75 degrees, so don't listen to me...Mark
it only has two wires. Polarity doesn’t matter, open circuit or closed circuit depending on temp setting. It’s a generic application switch.
never checked actual vent temp, just adjusted the switch until the evap stopped freezing up. Truck always feels cool. I use 134a.
Truck also has a modern condenser from an acura, and a fan shroud mod that moves alot of air even at idle. Not really a fair comparison to other, more stock first gens.
it only has two wires. Polarity doesn’t matter, open circuit or closed circuit depending on temp setting. It’s a generic application switch.
never checked actual vent temp, just adjusted the switch until the evap stopped freezing up. Truck always feels cool. I use 134a.
Truck also has a modern condenser from an acura, and a fan shroud mod that moves alot of air even at idle. Not really a fair comparison to other, more stock first gens.
That makes sense just a contact closure. Wonder what the third pin is for on the factory part? Guess I'll have to pull out my wiring diagrams.
Are you saying you have an electric fan for the condenser?
it only has two wires. Polarity doesn’t matter, open circuit or closed circuit depending on temp setting. It’s a generic application switch.
never checked actual vent temp, just adjusted the switch until the evap stopped freezing up. Truck always feels cool. I use 134a.
Truck also has a modern condenser from an acura, and a fan shroud mod that moves alot of air even at idle. Not really a fair comparison to other, more stock first gens.
Would you mind posting a pic of your condenser mount? What year and model Acura? I need to add a bigger condenser to my truck to work better with R134a.
I have no pictures of the setup. With the grille in the truck you really cant see it.
Really would not apply to a stock truck anyway. Everything from the engine forward has been modified. Part of the shroud is mounted to the engine, part is mounted to the radiator. The radiator is a custom aluminum unit. In front of that is a second gen intercooler. In front of that is the Acura TSX condenser. The only reason that I used that particular condenser is it was free from a friend of mine. Nothing about the condenser would make it an easy, or even close to being a good factory replacement part. It is very thin which helped me with stacking all that stuff in an originally non intercooled truck.
Mine was acting up so I moved it in and out out tube in the pressure line. So far it has worked for almost a year now. there is a special heat conducting grease that is used on the probe, Might be worth a try putting new grease on there before buying a new part.
Mine works fine after about 10 minutes, before then the compressor cycles about every 10 seconds. When I jumped the switch it runs fine and cools great. It's like after the electronics in the probe warm up it starts working fine. I just received the two I ordered, one from and older Chrysler which has the same three wires but a different plug on the end and the other a universal adjustable one like was mentioned here. I am picking up some thermal grease tomorrow so I will try the Chrysler one first and if it doesn't work I will try the universal one.
Mine works fine after about 10 minutes, before then the compressor cycles about every 10 seconds. When I jumped the switch it runs fine and cools great. It's like after the electronics in the probe warm up it starts working fine. I just received the two I ordered, one from and older Chrysler which has the same three wires but a different plug on the end and the other a universal adjustable one like was mentioned here. I am picking up some thermal grease tomorrow so I will try the Chrysler one first and if it doesn't work I will try the universal one.
You might want to post again, you're sitting on 666 ...Mark
Mine works fine after about 10 minutes, before then the compressor cycles about every 10 seconds. When I jumped the switch it runs fine and cools great. It's like after the electronics in the probe warm up it starts working fine. I just received the two I ordered, one from and older Chrysler which has the same three wires but a different plug on the end and the other a universal adjustable one like was mentioned here. I am picking up some thermal grease tomorrow so I will try the Chrysler one first and if it doesn't work I will try the universal one.
Interesting, let us know how it goes. Can you list the info on the two you bought.
The one I bought off Ebay for an older model Chrysler looked promising but no matter how I wired it, it was a dead short. The other one I bought off Ebay for $7.99, worked great . It is adjustable and I just made a bracket to mount it where the old one mounted, put some thermo paste I bought at Auto Zone on it, slid the sensor tube back in the hole on the hose and fired up the A/C and it was blowing at 38 to 40 degrees. I drove about 100 miles today and had no freeze up and it cooled great. The part number is UAC SW 6490C. Just cut the two outer wires and connect them to the switch. If you have any problems with freeze up you can just turn the **** to the left a little. Mine is set at just about the coldest which is to the right.
The one I bought off Ebay for an older model Chrysler looked promising but no matter how I wired it, it was a dead short. The other one I bought off Ebay for $7.99, worked great . It is adjustable and I just made a bracket to mount it where the old one mounted, put some thermo paste I bought at Auto Zone on it, slid the sensor tube back in the hole on the hose and fired up the A/C and it was blowing at 38 to 40 degrees. I drove about 100 miles today and had no freeze up and it cooled great. The part number is UAC SW 6490C. Just cut the two outer wires and connect them to the switch. If you have any problems with freeze up you can just turn the **** to the left a little. Mine is set at just about the coldest which is to the right
Thanks for posting! That's great news. I'm still wondering what the center wire function is. I do have the wiring diagrams so I'll take a look.
...Mark
