Can I bypass the heater core? - Infamous Nissan

horse · 06-14-2021, 08:33 AM

1990 nissan hardbody 2.4 ka. Ive got coolant dripping out of that little drainage weiner on the passenger side. Its summer and Im not gonna worry bout the heater until November. Can I bypass it? Also can a bum heater core cause a truck to run over half the gauge? Or overheat? Its also dripping out the bottom vents on the passenger side of the truck. If I can what size piping would i need? Or how have yall done it? I really really REALLY do not want to pull this dash apart in this heat. Thank you in advance! Oh and an update! trucks still running good and That hose popped off a second time but i caught it just in time! I moved the clamp up further and it hasnt givin me any trouble! But the heater core took a shit on me now lol

LugNut1990 · 06-14-2021, 11:27 AM

Yes, you can bypass it at the firewall.

Have A/C? If so are you certain it is coolant leaking, and not just condensate from the evaporator?

horse · 06-14-2021, 04:45 PM

I wish it was boss but it's green

cadillacdude1975 · 06-14-2021, 08:24 PM

Bypassing it will not hurt anything.

LugNut1990 · 06-14-2021, 09:31 PM

Slight exception: An old-school action, if overheating slowly due to a bad radiator/water pump/t-stat, is to turn to full heat + fan + outside air, and open the windows. No fun in the summer, during a 500 mile drive (I wonder how I know; different vehicle).

horse · 06-14-2021, 09:38 PM

Well its bypassed. and my temps are holding steady on half sometimes less, sometimes a little over it kinda fluctuates, but its not threatening to overheat like it was. it wasnt the easiest thing to get those hoses off. I threw a coolant coupler in between and its holding just fine. Ill worry about changing that core later. Thats a problem for winter Horse! lol I also had a fun time with the bleeder screw I dropped the god forsaken thing down in the engine bay and had to go hunting for it it fell and stuck on a lip on the block between the oil filter and the alternator I had to fish it out with a pencil, a fridge magnet, and some hot glue lol.

06-14-2021, 08:33 AM	#1
horse Join Date: May 2021 Location: ky Posts: 36 Vehicle: 1990 nissan d21 Thanks: 0 Thanked 15 Times in 9 Posts	Can I bypass the heater core? 1990 nissan hardbody 2.4 ka. Ive got coolant dripping out of that little drainage weiner on the passenger side. Its summer and Im not gonna worry bout the heater until November. Can I bypass it? Also can a bum heater core cause a truck to run over half the gauge? Or overheat? Its also dripping out the bottom vents on the passenger side of the truck. If I can what size piping would i need? Or how have yall done it? I really really REALLY do not want to pull this dash apart in this heat. Thank you in advance! Oh and an update! trucks still running good and That hose popped off a second time but i caught it just in time! I moved the clamp up further and it hasnt givin me any trouble! But the heater core took a shit on me now lol __________________ 1990 "Pinky Pete", Colorado rims, led headlight, nothin' fancy

06-14-2021, 11:27 AM	#2
LugNut1990 Join Date: Jul 2015 Location: N.E. Kansas Posts: 911 Vehicle: 1990 Nissan Hardbody Thanks: 0 Thanked 138 Times in 119 Posts	Yes, you can bypass it at the firewall. Have A/C? If so are you certain it is coolant leaking, and not just condensate from the evaporator? __________________ Original owner 1990 Nissan Hardbody, Aztec Red Standard cab, 4x4, KA24E, 5-speed Intentionally near-stock Mods: Second OEM horn, stereo/speakers/sub, mud and snow tires, HD trailer hitch (cat 3+), liquid bed liner, G1W dashcam Definitely not for sale!

06-14-2021, 04:45 PM	#3
horse Join Date: May 2021 Location: ky Posts: 36 Vehicle: 1990 nissan d21 Thanks: 0 Thanked 15 Times in 9 Posts	I wish it was boss but it's green __________________ 1990 "Pinky Pete", Colorado rims, led headlight, nothin' fancy

06-14-2021, 09:31 PM	#5
LugNut1990 Join Date: Jul 2015 Location: N.E. Kansas Posts: 911 Vehicle: 1990 Nissan Hardbody Thanks: 0 Thanked 138 Times in 119 Posts	Slight exception: An old-school action, if overheating slowly due to a bad radiator/water pump/t-stat, is to turn to full heat + fan + outside air, and open the windows. No fun in the summer, during a 500 mile drive (I wonder how I know; different vehicle). __________________ Original owner 1990 Nissan Hardbody, Aztec Red Standard cab, 4x4, KA24E, 5-speed Intentionally near-stock Mods: Second OEM horn, stereo/speakers/sub, mud and snow tires, HD trailer hitch (cat 3+), liquid bed liner, G1W dashcam Definitely not for sale!

06-14-2021, 09:38 PM	#6
horse Join Date: May 2021 Location: ky Posts: 36 Vehicle: 1990 nissan d21 Thanks: 0 Thanked 15 Times in 9 Posts	Well its bypassed. and my temps are holding steady on half sometimes less, sometimes a little over it kinda fluctuates, but its not threatening to overheat like it was. it wasnt the easiest thing to get those hoses off. I threw a coolant coupler in between and its holding just fine. Ill worry about changing that core later. Thats a problem for winter Horse! lol I also had a fun time with the bleeder screw I dropped the god forsaken thing down in the engine bay and had to go hunting for it it fell and stuck on a lip on the block between the oil filter and the alternator I had to fish it out with a pencil, a fridge magnet, and some hot glue lol. __________________ 1990 "Pinky Pete", Colorado rims, led headlight, nothin' fancy

06-14-2021, 08:24 PM	#4
cadillacdude1975 The Gear Jammer Join Date: Apr 2013 Location: Chattanooga, TN Age: 50 Posts: 10,678 Vehicle: 87 VG33 Pathfinder SE 4x4 & 87 D21 SE Thanks: 457 Thanked 1,400 Times in 1,265 Posts	Bypassing it will not hurt anything.

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