What do I do now?

[Stresst]

Finally dropped my truck back off so he can evaluate the a/c system. FYI when its cool (below 80) the a/c blows cold (around 40 degrees) but anything above that it blows around 60 which is not cool enough. He checked everything and said he put in 4 more ounces and said no leaks. But why is not cold? The only thing he can think off is the evaporator. I thought everything minus the compressor been replaced........

What the eff do I do?

 

[Stresst]

Anyone? Im about to blow this truck up!

 

[SunlitComet]

Anyone? I'm about to blow this truck up!

Becuase internal evaperator is still dependent on how much heat is extracted from the condenser outside. You are not going to get 40 degress inside when it is over 80 outside. Also make sure your engine is not overheating and ensure your fan clutch is in good shape. In addition r-134a is not as efficient as the original r-12.

 

[ChiTahoe]

Adding a pusher fan also helps a lot if you want to go that route.

 

[Stresst]

Becuase internal evaperator is still dependent on how much heat is extracted from the condenser outside. You are not going to get 40 degress inside when it is over 80 outside. Also make sure your engine is not overheating and ensure your fan clutch is in good shape. In addition r-134a is not as efficient as the original r-12.

No this truck actually runs very cool. The temp guage is on the line which is directly in th middle of 110 and 210 degrees. Which is 165 degrees. I was going to change the thermostat to see what happened but it seems there is a 160 in there already. In bumper to bumper traffic it only goes up to the middle of the temp guage. But it come's rite back down.

So I really dont know what's going on unless there is that much differance between the R-12 and R-134.?????? Im really baffled, I need more air.

Will a pusher fan really be better if its already running cool?

 

[SunlitComet]

1. Why do you need a low temp thermostat?

2. Even though air in force goes thru the tranny cooler, condenser and then radiator I was concerned about conductive heat in case any body wondered.

3. A pusher fan would go in front of the condenser pushing more air thru it under force. It would make a improvement but can not calculate how much exactly.

4. If your engine runs that cold than chances are your fan clutch is always running with a loose grip on the engine therefore not pulling a lot of air thru the condenser.

5. Are your front end heat exchange systems clean of debris as well?

6. Does your fan clutch have a tight grip on the engine when starting from cold engine causing loud fan noise then loosen up after a short time? If not your clutch may be broken. Which certainly isn't helping.

 

[Stresst]

1. Why do you need a low temp thermostat?

I guess it was in there when I bought it, cause I never changed it. I was actually thinking about putting a lower one in, not realizing it was already there. Very embarassing I had the truck over 5,6 years and never realized.....

2. Even though air in force goes thru the tranny cooler, condenser and then radiator I was concerned about conductive heat in case any body wondered.

3. A pusher fan would go in front of the condenser pushing more air thru it under force. It would make a improvement but can not calculate how much exactly.

Where do I begin? What do I need to buy? Have a part number? I would think you couldnt put a fan in between the grill and condensor pulling air. I would assume when driving it may over heat. But hey im no mechanic

4. If your engine runs that cold than chances are your fan clutch is always running with a loose grip on the engine therefore not pulling a lot of air thru the condenser.

How do I know if the fan clutch is shot?

5. Are your front end heat exchange systems clean of debris as well?

What do you mean by front end heat exchange systems? If you mean condensor and radiator, the condensor is a month old and the radiator is about 18 months old.

6. Does your fan clutch have a tight grip on the engine when starting from cold engine causing loud fan noise then loosen up after a short time? If not your clutch may be broken. Which certainly isn't helping.

Something I do notice when its very hot out the fan is loud when I accelerate. Reminds me of a low sounding flex fan.

BTW thanks for taking the time to help me out.....

 

[SunlitComet]

Unless you have a supercharger or something just use a 195 degree stock thermostat. if the fan howls when hot then it appears to be working fine and should sound the same on a cold engine start. It would quiet itself after a few minutes of idling or less at higher engine speed when starting cold.


For a pusher fan measure the available space you have in front of the condenser and find a pusher fan that will fit. They may or may not come with mounting hardware or a power control kit. Might have to by them separately. How much flat unobstructed space do you have in front of the condenser? will go from there.

As far as your t-stat goes it does not seem to be hurting your air conditioning but it sure is hell got to be hurting emissions and fuel mileage so i would change it back to the original requirement.

 

[Stresst]

I hear you about the thermostat and gas mileage but there is no way I can change it until I solve this a/c issue. Imagine the engine running at 35 degrees higher! I can't! LOL

---------- Post added at 09:53 PM ---------- Previous post was at 09:50 PM ----------

BTW I know the tranny cooler is in front of the condensor. Can the new puller overlap the tranny cooler? Or does it have to sit flat on the condensor?

I was looking on summit and ebay for pullers, how many CFM does it have to pull? I would assume anything is a plus but I would rather does this once. As far as wiring this, do I put it on a thermostat or manual switch tapped off of accesory power so I dont wind up with a dead battery?

 

[SunlitComet]

choose from a reputable manufacturer, then size, then get the best airflow the offer in that size. Unless you can seal the gaps from the mounting surface of fan and the radiators you may have to just put in on the condenser along the tranny exchanger or put one on each unit for maximum airflow but I would not recommend doing a twofer because if the tranny fluid drops below a certain temperature it effects shifting operations in an attempt to heat it up again. I would just switch to a total efan setup at that point. Tie a power relay to be triggered by the a/c clutch circuit. If it will help at all one on the condenser would be just fine. Could always add more circuitry to have it as a back up cooling fan for non a/c use later.