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**425HP409** · 09-14-2013, 01:01 AM

There are two styles of AC expansion valve bulbs, one type has a coil at the end like Napa #207307, and one that has a long fat type bulb like Napa #207300. I have found that the large bulb type works best. The installation of the bulb is critical, it must be attached to the evaporator outlet pipe securely. You must clean the outlet pipe down to bare metal, clamp the bulb to the outlet pipe with hose clamps, then wrap securely with AC tape, making sure that no outside air can get to the bulb.
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09-14-2013, 01:01 AM	#6
425HP409 425hp409 Join Date: Oct 2008 Location: Prosper Texas Posts: 841	Re: A/C expansion valve ? There are two styles of AC expansion valve bulbs, one type has a coil at the end like Napa #207307, and one that has a long fat type bulb like Napa #207300. I have found that the large bulb type works best. The installation of the bulb is critical, it must be attached to the evaporator outlet pipe securely. You must clean the outlet pipe down to bare metal, clamp the bulb to the outlet pipe with hose clamps, then wrap securely with AC tape, making sure that no outside air can get to the bulb. Posted via Mobile Device __________________ Charles 68 SWB, Dad bought new, now 396 & factory ac 64 Impala SS, 409 425HP, 4 speed AC 64 Bel Air Wagon, 400 Small Block 57 Bel Air all original 283 w/Factory Air 77 GMC Sprint, 454/425HP 67 Olds 442, all original 90 ZR1 Corvette