ArdWrknTrk Posted August 18 Share Posted August 18 My 78 Bronco has a vacuum operated shutoff in AC to turn off coolant flow to the heater core, but it doesn't redirect the coolant, its a dead stop so I always wondered what that means.... The bullnose trucks don't have this feature ??? OBS doesn't apparently... first thing I learned this week about OBS I also saw on the OBS Facebook page that this is a very common mod, in fact someone recommended this adapter to accomplish this... " people say it's good for another 5 to 10°" ....the one below would redirect coolant flow so I'm considering using the one below on the Bronco... https://www.amazon.com/dp/B000C2QSVQ/?coliid=IGZP4S810JO0X&colid=3IGQF00LDI4AO&psc=1&ref_=cm_sw_r_cp_ud_lstpd_P7BBT8310K96X74T956M With Ford trucks the heater core is always bypassing the thermostat, so you don't really get airbound or ever lose heat. If you see where it taps into the water pump, and the intake bypasses right back, you can understand. Link to comment Share on other sites More sharing options...
85lebaront2 Posted August 18 Share Posted August 18 My 78 Bronco has a vacuum operated shutoff in AC to turn off coolant flow to the heater core, but it doesn't redirect the coolant, its a dead stop so I always wondered what that means.... The bullnose trucks don't have this feature ??? OBS doesn't apparently... first thing I learned this week about OBS I also saw on the OBS Facebook page that this is a very common mod, in fact someone recommended this adapter to accomplish this... " people say it's good for another 5 to 10°" ....the one below would redirect coolant flow so I'm considering using the one below on the Bronco... https://www.amazon.com/dp/B000C2QSVQ/?coliid=IGZP4S810JO0X&colid=3IGQF00LDI4AO&psc=1&ref_=cm_sw_r_cp_ud_lstpd_P7BBT8310K96X74T956M That appears to be a very common Chrysler FWD car heater valve. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 18 Share Posted August 18 Right away Captain! I think I'm just going to install a 5/8 barbed ball valve and let the water pump dead head against it. I'm* a big fan of 'KISS' and everything I see just seems weird and bulky. Link to comment Share on other sites More sharing options...
viven44 Posted August 18 Share Posted August 18 I think I'm just going to install a 5/8 barbed ball valve and let the water pump dead head against it. I'm* a big fan of 'KISS' and everything I see just seems weird and bulky. Jim, I ordered this today for my Bronco. https://www.amazon.com/dp/B0989DJLXJ/?coliid=I3F4M217CO34UG&colid=3IGQF00LDI4AO&psc=1&ref_=cm_sw_r_cp_ud_lstpd_66YGSYCEF3ZYJGVR6203 I will see how this manual one works. Needs to be adjusted twice a year... not too bad. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 19 Share Posted August 19 Jim, I ordered this today for my Bronco. https://www.amazon.com/dp/B0989DJLXJ/?coliid=I3F4M217CO34UG&colid=3IGQF00LDI4AO&psc=1&ref_=cm_sw_r_cp_ud_lstpd_66YGSYCEF3ZYJGVR6203 I will see how this manual one works. Needs to be adjusted twice a year... not too bad. They sell this one -with hose clamps!- for $19. What's different??? Link to comment Share on other sites More sharing options...
viven44 Posted August 19 Share Posted August 19 They sell this one -with hose clamps!- for $19. What's different??? One ships from a "ZHUZHIMAO" for $6.99 and will take 2 weeks to get here and the other from Amazon for free and arrives today.. I'd rather pick the known devil Truth is I didn't shop... I just picked something and went with it.. as long as it had good reviews. By the way -- this morning I let the AC turn on immediately so the coolant block off valve was effective from the get go... it made a big improvement in perceived cooling. I think a manual valve's function may be superior as an automatic vacuum operated valve can temporarily allow coolant flow if someone messed with the controls while driving and filling up the heater core.... but if one was diligent in leaving the AC on all the time that wouldn't be an issue. I don't use the AC much unless I felt uncomfortable so a manual valve would suit me better. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 19 Share Posted August 19 One ships from a "ZHUZHIMAO" for $6.99 and will take 2 weeks to get here and the other from Amazon for free and arrives today.. I'd rather pick the known devil Truth is I didn't shop... I just picked something and went with it.. as long as it had good reviews. By the way -- this morning I let the AC turn on immediately so the coolant block off valve was effective from the get go... it made a big improvement in perceived cooling. I think a manual valve's function may be superior as an automatic vacuum operated valve can temporarily allow coolant flow if someone messed with the controls while driving and filling up the heater core.... but if one was diligent in leaving the AC on all the time that wouldn't be an issue. I don't use the AC much unless I felt uncomfortable so a manual valve would suit me better. I'm paying more than $7 for 4 stainless hose clamps and I'm in no rush. While I appreciate immediate gratification I don't necessarily need it. Link to comment Share on other sites More sharing options...
viven44 Posted August 19 Share Posted August 19 I'm paying more than $7 for 4 stainless hose clamps and I'm in no rush. While I appreciate immediate gratification I don't necessarily need it. Well I rushed it, its here... but I am busy and don't have time to get to it until next week so you did well Link to comment Share on other sites More sharing options...
viven44 Posted August 21 Share Posted August 21 I'm paying more than $7 for 4 stainless hose clamps and I'm in no rush. While I appreciate immediate gratification I don't necessarily need it.http://www.garysgaragemahal.com/uploads/6/5/8/7/65879365/laughing-25-x-25_orig.gif Installed it in series with existing factory vacuum operated valve so I can use both depending on how lazy I am in spring/fall Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted August 22 Share Posted August 22 Installed it in series with existing factory vacuum operated valve so I can use both depending on how lazy I am in spring/fall Maybe 3 minutes, and 3oz of coolant.... DONE! Link to comment Share on other sites More sharing options...
Recommended Posts