old55pete Posted August 8, 2020 Share Posted August 8, 2020 Wonder if HF has one of them air meters? Dave ---- I didn't see one online but did see this fuse buddy knockoff tester Nothing a multimeter can't do and doesn't help with the vent airflow test but still looks convenient in some situations. I have something similar to that tester and it will also show a parasidic draw, just plug it in in place of the fuse and leave it sit for a few minutes and it will show the how much of a draw that fuse has over the amount of time it was plugged in. Link to comment Share on other sites More sharing options...
Gary Lewis Posted August 8, 2020 Share Posted August 8, 2020 I have something similar to that tester and it will also show a parasidic draw, just plug it in in place of the fuse and leave it sit for a few minutes and it will show the how much of a draw that fuse has over the amount of time it was plugged in. I have the one Scott linked to, and it works nicely. Handy for testing circuits. Link to comment Share on other sites More sharing options...
BullnoseLuvr Posted August 9, 2020 Author Share Posted August 9, 2020 Wonder if HF has one of them air meters? Dave ---- I didn't see one online but did see this fuse buddy knockoff tester Nothing a multimeter can't do and doesn't help with the vent airflow test but still looks convenient in some situations. It sure beats hooking up your meter and pulling fuses to find the parasite. Mark Link to comment Share on other sites More sharing options...
BullnoseLuvr Posted August 9, 2020 Author Share Posted August 9, 2020 The relay kit came in, and there's precious little info on it, just like you said. May just have to go looking for the TSB. Any guess on dates? I just received mine too. Since I have it I might as well hook it up. Mark Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 9, 2020 Share Posted August 9, 2020 The relay kit came in, and there's precious little info on it, just like you said. May just have to go looking for the TSB. Any guess on dates? I just received mine too. Since I have it I might as well hook it up. Mark Seems like a good piece of kit. Screws, clip nuts, crimps, zip ties. A solid socket to mount, beefy wires and a genuine Bosch relay (from before they sold out) Link to comment Share on other sites More sharing options...
BullnoseLuvr Posted August 9, 2020 Author Share Posted August 9, 2020 The relay kit came in, and there's precious little info on it, just like you said. May just have to go looking for the TSB. Any guess on dates? I just received mine too. Since I have it I might as well hook it up. Mark After replacing the evap and cleaning all the crap out of the blower box and finding a dramatic improvement in airflow, the fan started vibrating. I pulled it and cleaned the crap out of the squirrel cage and reached through the fan hole into the drain well and found several inches of rich topsoil. I dug and dug and dug and finally got it all out and found the drain. Everything is clean and the drain is now open for business. I took a closer look at the old evap from the fan side and it’s 2/3 clogged. No wonder air flow was nil. Mark Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 9, 2020 Share Posted August 9, 2020 After replacing the evap and cleaning all the crap out of the blower box and finding a dramatic improvement in airflow, the fan started vibrating. I pulled it and cleaned the crap out of the squirrel cage and reached through the fan hole into the drain well and found several inches of rich topsoil. I dug and dug and dug and finally got it all out and found the drain. Everything is clean and the drain is now open for business. I took a closer look at the old evap from the fan side and it’s 2/3 clogged. No wonder air flow was nil. Mark This is why I always say "pull those rubber drains from behind the front wheels and flush the muck out with a hose" We're the enthusiasts here. The ones that care enough about our old trucks to dig in and make them right (in many cases righter) No one wants their truck to rot from the kickpanels out. And IN, where water pools on the floor behind the door seal pinch flange every time it rains. Hopefully today I'll have a chance to see all that again, after replacing it a couple of months ago. Link to comment Share on other sites More sharing options...
kramttocs Posted August 12, 2020 Share Posted August 12, 2020 So I measured my airflow with the engine at 1500 rpm, all accessories off and controls on MAX A/C with no compressor since the system isn't finished yet. These numbers are meaningless since I didn't take "before" measurments but they might be of interest to the next person who measures his truck vent airflow with an anemometer. The pics are the vents left to right in two passes, 8 pics total. I apologize for the sidewaysness but I'm just not up to rotating the pics. Mark I couldn't remember the exact details of your test so I didn't match the criteria very well. This was after a 30 minute drive home from a Lowe's run so: Idling in Park (~900 rpm) Fan on High in Vent Radio on Door open Hot side relay mod You are right in that it makes a huge difference where on the vent you measure. Since I figure all we care about is the fastest speed, I moved the anemometer around until I found the fastest speed for each vent. Driver-left: 1259 ft/min Driver-right: 1317 ft/min Passenger-left: 2115 ft/min Passenger-right: 1249 ft/min I had to get stuff unloaded as it started raining but I want to do the test again with all of the vents shut except the Passenger-left vent. So only measure that vent. We aren't really concerned with the spread but rather if the relay mods make a difference. I'll measure that vent with and without the relay mod. Mike - can you do the same? Also can you put yours in vent? Figure that will be a common setting that all users will have available if more want to post results. Link to comment Share on other sites More sharing options...
BullnoseLuvr Posted August 12, 2020 Author Share Posted August 12, 2020 I couldn't remember the exact details of your test so I didn't match the criteria very well. This was after a 30 minute drive home from a Lowe's run so: Idling in Park (~900 rpm) Fan on High in Vent Radio on Door open Hot side relay mod You are right in that it makes a huge difference where on the vent you measure. Since I figure all we care about is the fastest speed, I moved the anemometer around until I found the fastest speed for each vent. Driver-left: 1259 ft/min Driver-right: 1317 ft/min Passenger-left: 2115 ft/min Passenger-right: 1249 ft/min I had to get stuff unloaded as it started raining but I want to do the test again with all of the vents shut except the Passenger-left vent. So only measure that vent. We aren't really concerned with the spread but rather if the relay mods make a difference. I'll measure that vent with and without the relay mod. Mike - can you do the same? Also can you put yours in vent? Figure that will be a common setting that all users will have available if more want to post results. Here's our results compared. I was at idle (650 rpm) on MAX A/C with the doors closed, no relay mod. Mark DL DR PL PR TOTAL Mark 1232 1074 1584 1419 5309 Scott 1259 1317 2115 1249 5940 Link to comment Share on other sites More sharing options...
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