Bench testing a HT6?

daman on Sat July 09, 2011 8:20 PM

Want to test this comp before install was told it's a good one(used)rigged up a test manifold so i can bench check with vacuum pump and or shop air(PSI),anybody see a problem with testing using air pressure? sometimes they hold with vacuum but leak under pressure(just had it happen),thinking of 100 psi submerged in water, tested a known bad one and showed seam leak @100.

thoughts?

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

GM Tech on Sat July 09, 2011 10:26 PM

I use refrigerant and a sniffer- and/or dye to bench check with.

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

daman on Sun July 10, 2011 10:43 AM

Right but any problems tech you see with doing this?

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

GM Tech on Sun July 10, 2011 10:54 AM

Just that you won't find a slow leak...

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

daman on Sun July 10, 2011 12:13 PM

Ahh i dunno the one i already tested had to be a slow leak, @ 100psi there were only a bubble or two every few mins. but proved good under vac.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

daman on Sun July 10, 2011 12:19 PM

I guess my point is i'm wondering if pressurizing the pump would "damage" it in any way,,IMO i don't think so as these pumps operate under 200-300PSI normally on the high side.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

bohica2xo on Sun July 10, 2011 12:22 PM

You might find a leak that way, but you could still have a bad compressor. It could have 1/8" deep gouges in cylinder walls, and still pass your test. The reed valves could leak, and still pass your test.

Try this instead:

Compressor testing

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

daman on Sun July 10, 2011 2:00 PM

Thanks yea i seen that wright up.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

Automotive Air Conditioning Information Forum (Archives)