Tbi ac

[Schurkey]

Edited because I'm still working on my first cup of coffee, which means that not only can I not see colors yet, but my thought processes aren't appropriately engaged.

 

[tsr2185]

Have you put a R134a specific cycling switch?

System was already converted to 134 before i got it. Switch was never changed, but I know it cuts out at 20psi. When I take off the high and low side fitting protectors I can swear I hear a small release of pressure. I'm wondering of the valves are slowly leaking because it was properly charged last summer.

 

[tsr2185]

Thanks guys. I got another 12oz can today hopefully that should do the trick. Supposed to 90f around lunch and gonna try it then.

 

[PlayingWithTBI]

Supposed to 90f around lunch and gonna try it then.

It's getting about time, it was 84° at 8:00 here.

 

[tsr2185]

So ambient was 88, humidity was 60ish. Before charge was 20/150ish. After a full 12oz can it was 30/190. Vent temp was 60ish. Apparently I have a slow leak and may need at least another half can. 60f I can live with lol but I know it ain't perfect. Compressor stayed running and sounded like it ran more quietly than before. Chart says my pressure are way lower. And vent temp is way higher than expected. ‍

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[tsr2185]

Driving down hwy gets about to 56f vent temp. Sitting in 90+ weather for about 20 min in school line the coolant temp climbed from normally 190 to about 210 and pretty much stopped blowing cold all together until I got back to driving. Assuming this is still normal undercharged situation?

 

[PlayingWithTBI]

Sitting in 90+ weather for about 20 min in school line the coolant temp climbed from normally 190 to about 210 and pretty much stopped blowing cold all together until I got back to driving. Assuming this is still normal undercharged situation?

Or, your engine fan isn't pulling enough air through the condenser. I upgraded mine to the 11 blade fan which helped quite a bit. Maybe add a pusher fan? Are you running a parallel flow condenser? That'll help too.

 

[tsr2185]

Or, your engine fan isn't pulling enough air through the condenser. I upgraded mine to the 11 blade fan which helped quite a bit. Maybe add a pusher fan? Are you running a parallel flow condenser? That'll help too.

I saw a thread about the 11 blade fan. I bought a cheaper condensor from rock auto last summer. Not sure style it is, just remember it being a UAC about around 80$

What's a pusher fan?

 

[L31MaxExpress]

I saw a thread about the 11 blade fan. I bought a cheaper condensor from rock auto last summer. Not sure style it is, just remember it being a UAC about around 80$

What's a pusher fan?

Its an electric fan that mounts behind the grille and pushes air into the condenser. My 99 Tahoe came with one from the factory.

 

[tsr2185]

Or, your engine fan isn't pulling enough air through the condenser. I upgraded mine to the 11 blade fan which helped quite a bit. Maybe add a pusher fan? Are you running a parallel flow condenser? That'll help too.

Looked back in email and it is a UAC parallel condensor...

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