Plugs for water pump when deleting hvac?
10-22-2018, 02:14 AM
#3
You can’t plug them. This system doesn’t have a heater control valve like most other systems, it requires a constant flow to circulate coolant throughout the engine. You need to loop them or you will get hotspots.
10-23-2018, 01:14 PM
#5
TECH Senior Member
Same sizes as the heater hoses that would have hooked to it, one end will be a bit larger than the other due to the 2 sizes of the fittings.
11-09-2018, 04:43 PM
#7
Completely false. Nothing wrong with plugging them. By looping them you actually hurt cooling. The rear chamber (engine side) is for bypass cooling (circulation while the tstat is closed). That’s why LS engines have 2 steps on the back of the Tstat. When the stat opens at temp coolant is forced through the the engine and radiator and it closes off the back of the Tstat (bypass area). You can plug the heater ports no issue. Most Tstats stock or aftermarket have a step in the back sealing ring to allow some water bypass between the 2 chambers and mr gasket has a few 3/16” holes for the same purpose.
It’s common to delete the Tstat by removing it, plugging the heater ports and installing a freeze plug in the hole
behind the Tstat while drilling a single 3/16” hole for air and small coolant transfer. This negates the tstat and thus you get maximum cooling but offers no control of the temp as the engine will find is own happy medium.
I’ve plugged my heater ports on 2 engines, run a aftermarket Tstat and never had a problem.
It’s common to delete the Tstat by removing it, plugging the heater ports and installing a freeze plug in the hole
behind the Tstat while drilling a single 3/16” hole for air and small coolant transfer. This negates the tstat and thus you get maximum cooling but offers no control of the temp as the engine will find is own happy medium.
I’ve plugged my heater ports on 2 engines, run a aftermarket Tstat and never had a problem.
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11-09-2018, 06:16 PM
#9
ModSquad
iTrader: (6)
Completely false. Nothing wrong with plugging them. By looping them you actually hurt cooling. The rear chamber (engine side) is for bypass cooling (circulation while the tstat is closed). That’s why LS engines have 2 steps on the back of the Tstat. When the stat opens at temp coolant is forced through the the engine and radiator and it closes off the back of the Tstat (bypass area). You can plug the heater ports no issue. Most Tstats stock or aftermarket have a step in the back sealing ring to allow some water bypass between the 2 chambers and mr gasket has a few 3/16” holes for the same purpose.
It’s common to delete the Tstat by removing it, plugging the heater ports and installing a freeze plug in the hole
behind the Tstat while drilling a single 3/16” hole for air and small coolant transfer. This negates the tstat and thus you get maximum cooling but offers no control of the temp as the engine will find is own happy medium.
I’ve plugged my heater ports on 2 engines, run a aftermarket Tstat and never had a problem.
It’s common to delete the Tstat by removing it, plugging the heater ports and installing a freeze plug in the hole
behind the Tstat while drilling a single 3/16” hole for air and small coolant transfer. This negates the tstat and thus you get maximum cooling but offers no control of the temp as the engine will find is own happy medium.
I’ve plugged my heater ports on 2 engines, run a aftermarket Tstat and never had a problem.
11-09-2018, 10:43 PM
#10
TECH Resident
Save your breathe. I agree 100% with you, and I’ve argued this point with these guys in the past. They just keep throwing up false info. Lots of guys plug the holes without issue. Last argument session I was told my engine would blow up if the holes were plugged. Lol!
11-09-2018, 11:42 PM
#11
Looping is perfectly fine. I drove my car 2 months looped when my heater hose sprung a leak before I repaired it (see sticky).
It causes absolutely no change in cooling ability....... I always drive around with one of these in my car in case the heater core pops or the lines start leaking, so I'm not just screwed on the side of the road. Pop it on and go.
Manufactured specifically for the LS engine.
OR
Dayco #87629....cut to fit.
.
It causes absolutely no change in cooling ability....... I always drive around with one of these in my car in case the heater core pops or the lines start leaking, so I'm not just screwed on the side of the road. Pop it on and go.
Manufactured specifically for the LS engine.
OR
Dayco #87629....cut to fit.
.
11-10-2018, 12:03 AM
#12
I've run the same engine looped and plugged ran the same temperature both ways, Obviously looped isn't going to be a problem because flow wise it's the same as running to a heater core and back. Plugged doesn't seem to be an issue either, I've run them that way and so have countless others.