Air Conditioning
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Junior User
Joined: May 2003
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Air Conditioning
Hey, has anybody in the southwest experienced a warming of the air conditioning system at a stop light?? I run the air on max most of the time here is Vegas and it blows cold when I am driving, but as I stop for a light, the air will begin to blow noticable warmer. Noticable warmer than my expedition or other vehicles that I have driven. Does the engine produce that much heat in these V-10's?? hate the heat, love the truck.....
Pat
Pat
Elder User
Joined: May 2003
Posts: 858
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Air Conditioning
I will be interested to hear as well. It is getting hot here in Northern CA. and I have noticed the same thing. I did find the factory water valve and it only closes the hot water off when the AC is on MAX.
Logistics Pro
Joined: Jan 2002
Posts: 3,733
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Air Conditioning
Did not know that the 03s had a hot water valve, interesting...
The 99-02 design does not have any hot water valve so the AC/Heater plenum are always heated by the core.
Thers are several modifications to fix this
check out eurekaboy.com for Stan's method.
do some serching to find out who has the heater shutoff valve "kits"
some trucks have 3/4 pipe some have 7/8 and there is some frustration about what fits what.
Bottom line is you can increase the cold air by shutting down the hot water.
Remember if you jerry rig a shut off that, you will need to open the line occasionally to prevent sludge and crap in the core.
The 99-02 design does not have any hot water valve so the AC/Heater plenum are always heated by the core.
Thers are several modifications to fix this
check out eurekaboy.com for Stan's method.
do some serching to find out who has the heater shutoff valve "kits"
some trucks have 3/4 pipe some have 7/8 and there is some frustration about what fits what.
Bottom line is you can increase the cold air by shutting down the hot water.
Remember if you jerry rig a shut off that, you will need to open the line occasionally to prevent sludge and crap in the core.
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Junior User
Joined: May 2003
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Air Conditioning
Thanks Fredvon4, I knew there must be some sort of fix, but being 'short' on the mechanical end, I just need the help and the guidance. I'll check out the site and let you know the outcome here in Vegas. It's 107-degrees today and only getting hotter.
Just as I joined this site and wanted to improve and tinker with the truck, a '78 caprice station wagon ran into my side door yesterday at Wal-Mart. I'm practicing patience........
Pat
Just as I joined this site and wanted to improve and tinker with the truck, a '78 caprice station wagon ran into my side door yesterday at Wal-Mart. I'm practicing patience........
Pat
Elder User
Joined: May 2003
Posts: 858
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Air Conditioning
Vegas, Sorry to hear about your truck. These Firestones love to hold rocks and I have 3 big stone chips to show for it on a 2 week old truck!!! I put Husky mud flaps on so I hope they will help.
It got to 97 here today so I got to make a couple of observations on the AC.
1. There is a gap of 9-10 inches between the back of the condenser and the front of the radiator. There doesn't seem to be enough air being drawn over the condenser when standing still.
2. When I turned the engine off, the engine fan spun but not freeley, so the fan clutch was hooked up to some %. I don't know what temp the fan clutch engages nor the % of lock-up.
Just a couple of observations.
It got to 97 here today so I got to make a couple of observations on the AC.
1. There is a gap of 9-10 inches between the back of the condenser and the front of the radiator. There doesn't seem to be enough air being drawn over the condenser when standing still.
2. When I turned the engine off, the engine fan spun but not freeley, so the fan clutch was hooked up to some %. I don't know what temp the fan clutch engages nor the % of lock-up.
Just a couple of observations.
Logistics Pro
Joined: Jan 2002
Posts: 3,733
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Air Conditioning
Antelope V-10
If really curious how the Newer SuperDuty (99 and up) AC systems work, there is a fair amount of info on the diesel site. I have never cruised through the FAQs here, so maybe some info there also.
Most suprising to most owners is the fact that the AC system cycles on in most of the switch settings and even periodically when the "air" is OFF...interesting
Another quirk is the amount of heat the AC system has to overcome due to design of the heating system and placement of the AC condensor (or is it evaporator) in the cab.
Any way many owners (especially in the HOT states) are not happy with the amout of time it takes to cool down the cabin.
It seems the MOST effective mod is to kill the hot water to the core. (my lazy self will probably do it this summer)
If really curious how the Newer SuperDuty (99 and up) AC systems work, there is a fair amount of info on the diesel site. I have never cruised through the FAQs here, so maybe some info there also.
Most suprising to most owners is the fact that the AC system cycles on in most of the switch settings and even periodically when the "air" is OFF...interesting
Another quirk is the amount of heat the AC system has to overcome due to design of the heating system and placement of the AC condensor (or is it evaporator) in the cab.
Any way many owners (especially in the HOT states) are not happy with the amout of time it takes to cool down the cabin.
It seems the MOST effective mod is to kill the hot water to the core. (my lazy self will probably do it this summer)
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Air Conditioning
Vegas,
If you do a search on "heater control valve", you should find plenty of info on this subject. I haven't done the mod yet, but plan to in the next few weeks. My ride's a 2000 so it doesn't have any control valve. I'll be installing one to shut off the heated water flow in vent, a/c, and max a/c. Those that have done the mod indicate significant improvement in a/c performance.
Regards,
Power
If you do a search on "heater control valve", you should find plenty of info on this subject. I haven't done the mod yet, but plan to in the next few weeks. My ride's a 2000 so it doesn't have any control valve. I'll be installing one to shut off the heated water flow in vent, a/c, and max a/c. Those that have done the mod indicate significant improvement in a/c performance.
Regards,
Power
I think it's a lack of air flow accoss the coils. The valve mod will help too. It was 111 here the other day... 
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Junior User
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Air Conditioning
PW..
Thanks for the info. I'll check it out next week for sure.
V10MAN...
I was just in Phoenix this weekend with my 5th, (Roosevelt Lake). Just noticed that the only thing the Chevy's pull are small boats to the lake..... I still passed them and waved...
Man it is hot in your town, couldn't hardly keep the beer cold in the trailer.
Vegas
Thanks for the info. I'll check it out next week for sure.
V10MAN...
I was just in Phoenix this weekend with my 5th, (Roosevelt Lake). Just noticed that the only thing the Chevy's pull are small boats to the lake..... I still passed them and waved...
Man it is hot in your town, couldn't hardly keep the beer cold in the trailer.
Vegas
Senior User
Joined: Mar 2003
Posts: 466
Likes: 1
Air Conditioning
All AC units work better when the engine is reving/driving. I don't know the reason but I noticed that it happens in all the cars I have ever owned.
Also, I notice that the AC in my truck (also in Vegas) cools much better on really hot days if it isn't on the highest fan speed but the 3rd one instead. I leave it on the highest for awhile then kick it down to the 3rd setting and usually get too cold!
Also, I notice that the AC in my truck (also in Vegas) cools much better on really hot days if it isn't on the highest fan speed but the 3rd one instead. I leave it on the highest for awhile then kick it down to the 3rd setting and usually get too cold!