![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Registered User
![]() Join Date: Nov 2008
Location: Ridgecrest, CA.
Posts: 193
|
![]()
Go my A/c charged up...new hoses..and works great..well it did for a day..now it still blows ice cold..but just on lowand medium speed...
My A/C system is all stock 1968..with the R12 in it.. My question is...Does the High Speed on the Fan Switch have a separate resistor? I looked up some a/c parts in my Classic Parts Catalog and I see a A/C Blower Motor Relay and a Heater A/C blower speed resisitor..could either one of these cause hi speed to go out? I asked the guy who did my a/c for me and I t hink he wants me to bring it in for him to fix for more money..and to be quite honest i'm beginning to be tapped money wise....i'd like to fix myself if i can...Any help would be appreciated here.. thx kevin |
![]() |
![]() |
![]() |
#2 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
|
Re: A/C Question on 68 c10
Heres a diagram. Hope it helps.
__________________
john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
![]() |
![]() |
![]() |
#3 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
|
![]()
Past experance with mine is fan switch will burn up, plastic connection on fan switch will melt and wires want make contact. Check the switch and connections. I redid the spade connections and all has been fine for several years now.
![]()
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
![]() |
![]() |
![]() |
#4 | |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,006
|
Re: A/C Question on 68 c10
Quote:
![]()
__________________
1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
|
![]() |
![]() |
![]() |
#5 | |
Registered User
![]() Join Date: Nov 2008
Location: Ridgecrest, CA.
Posts: 193
|
![]() Quote:
installed a belt...turned ok..then i took to a/c shop...he added freon and oil...and ran it and tested for leaks said all was good..cost me 240 bux...he said "freon aint cheap" ahahhaha oh well..i got a/c now...soon will have high speed i hope |
|
![]() |
![]() |
![]() |
#6 |
Registered User
Join Date: Oct 2001
Location: Grapevine, Tx.
Posts: 2,142
|
Re: A/C Question on 68 c10
socalkevin68
Check the ground wire from the relay on the firewall. It is very short It is located up high between the glove box and passenger side wall. There is a short ground wire that is supposed to go one of the shroud bolts that come through the firewall Easy test is to attach a short piece of wire while it is on high from the relay to ground. A lot of folks do not get the ground re-attached correctly while working on the heater coil. The symptoms are Low= Low Medium= Medium High = Very Slow __________________
__________________
John Hutchison Grapevine,Texas 68 1/2 t swb 68 Mustang 69 Jaguar 71 1/2 t swb 88 Supra CompTs6m 93 Escort GT 2005 Corolla XRS |
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
|
Re: A/C Question on 68 c10
Like others have said, there is a good chance the switch plug is melted from all the current running around back there. Resistors work by turning energy into heat. That heat eventually melts wires.
What I found is that EVERY AC control fan switch plug I found in junk yards was melted so be prepared to purchase a re-pop from LMC or similar. Then go to NAPA and order a handfull of part number 725147. This is the gold colored wire end that fits in the the switch plug. I keep a little pocket in my connector box full of them because they are used on lots of wires in this vintage of GM vehicle. Those wire ends, new plug, some yellow, light blue, and dark blue wire and an afternoon of time and you can rehab all those circuts. You should be good to go for another 42 years. I don't work for LMC or NAPA
__________________
'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
![]() |
![]() |
![]() |
Bookmarks |
|
|