HEI Problem or AC Problem? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

treefrog · 10-10-2002, 04:48 PM

I converted to HEI, timing was right it seemed. The same weekend, I changed to a POA valve update kit, keeping the R 12.
The AC is fine, The HEI seems fine. BUT, there is a hesitation on the highway approximately every 7 - 10 seconds, when I'm running with the ac on, that is not there with the ac off. I am slowly turning this truck from a really neat driver into an ulcer. What did I do this time? Any help would be appreciated. TF

Gordo · 10-10-2002, 04:51 PM

I'm thinkin ac overcharged, have you checked the pressures?

Vince M · 10-10-2002, 05:03 PM

The POA update kit cycles the compressor on and off based on pressure. This will create a load on the motor while driving but since mine isn't hooked up yet I can't tell you if what your feeling while driving is normal. Hopefully by next week. Waiting on a replacement hose.

10-10-2002, 04:48 PM	#1
treefrog Registered User Join Date: May 2002 Location: Knoxville, TN USA Posts: 189	HEI Problem or AC Problem? I converted to HEI, timing was right it seemed. The same weekend, I changed to a POA valve update kit, keeping the R 12. The AC is fine, The HEI seems fine. BUT, there is a hesitation on the highway approximately every 7 - 10 seconds, when I'm running with the ac on, that is not there with the ac off. I am slowly turning this truck from a really neat driver into an ulcer. What did I do this time? Any help would be appreciated. TF

10-10-2002, 04:51 PM	#2
Gordo Registered User Join Date: Jan 2001 Location: Killingworth, CT. USA Posts: 3,378	I'm thinkin ac overcharged, have you checked the pressures? __________________ 1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist.

10-10-2002, 05:03 PM	#3
Vince M Senior Member Join Date: Apr 2000 Location: Orlando, FL Posts: 1,076	The POA update kit cycles the compressor on and off based on pressure. This will create a load on the motor while driving but since mine isn't hooked up yet I can't tell you if what your feeling while driving is normal. Hopefully by next week. Waiting on a replacement hose. __________________ ............................................................ 68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements.

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