Heater Core bypass

mpj76 · 09-05-2002, 12:48 PM

Hey,

I removed my heater core after it went out and am bypassing it using HELP! bypass caps. I'd rather just do a U-turn with a piece of hose but the inlet/outlet are different diameters. Anyone out there do something similar? What is the sensor that plugs into one of the metal coolant pipes that's connected to the uppoer intake manifold? Does it take incorrect measurements when bypass CAPS are used since flow is eliminated? Can those two pipes (all one piece) be removed and the hole in the manifold be plugged? Will it set off a check engine light or will something else get screwed up if that sensor is disconnected? Thanks.

91 LX 5.0 FHP coupe

Mach 1 · 09-05-2002, 01:01 PM

Thats the coolant temp. sensor for the computer. Leave it. There are several ways to get around your problem, but I would recomend just to replace the heater core. Its the best fix

SlowGT · 09-05-2002, 01:04 PM

If I recall, the sensor on the passenger's side of the intake is where the computer gets its temperature input from and the one on the driver's side is the sender for the temp gauge in the dash. If you block flow to the computer input, it's probably not going to be very happy about it. The ECM uses this input to determine which fuel map to use. With the flow blocked off, it'll always think that the car is still warming up. The sensor may not get hot enough for the computer to recognize that the engine is up to normal operating temperature. I plan on bypassing mine in the near future also. Let us know if you come up with any good ideas. I was thinking about relocating the sensor down into the coolant path. I'm not sure if that's possible. I haven't really spent any time looking at it since I decided to do it.

fiveohpatrol · 09-05-2002, 04:01 PM

just use a U shaped piece of tubing and tighten down the hose clamps

I was working on something on my car a couple years back and accidentally BROKE one of the tubes off of the heater core going into the firewall. It was summer so I just pulled that tube out (about a 90deg bend in it) and used it to bypass the heater core. It worked great until november and I needed to use my defrost

silver_pilate · 09-05-2002, 04:03 PM

You can buy male-male connectors with different sizes on either end. That's what I did until I decided to replace the core.

--nathan

09-05-2002, 12:48 PM	#1
mpj76 Registered Member Join Date: Sep 2002 Posts: 158	Heater Core bypass Hey, I removed my heater core after it went out and am bypassing it using HELP! bypass caps. I'd rather just do a U-turn with a piece of hose but the inlet/outlet are different diameters. Anyone out there do something similar? What is the sensor that plugs into one of the metal coolant pipes that's connected to the uppoer intake manifold? Does it take incorrect measurements when bypass CAPS are used since flow is eliminated? Can those two pipes (all one piece) be removed and the hole in the manifold be plugged? Will it set off a check engine light or will something else get screwed up if that sensor is disconnected? Thanks. 91 LX 5.0 FHP coupe

09-05-2002, 01:01 PM	#2
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	Thats the coolant temp. sensor for the computer. Leave it. There are several ways to get around your problem, but I would recomend just to replace the heater core. Its the best fix __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

09-05-2002, 01:04 PM	#3
SlowGT Registered Member Join Date: Jun 1999 Location: Columbia Co, PA Posts: 303	If I recall, the sensor on the passenger's side of the intake is where the computer gets its temperature input from and the one on the driver's side is the sender for the temp gauge in the dash. If you block flow to the computer input, it's probably not going to be very happy about it. The ECM uses this input to determine which fuel map to use. With the flow blocked off, it'll always think that the car is still warming up. The sensor may not get hot enough for the computer to recognize that the engine is up to normal operating temperature. I plan on bypassing mine in the near future also. Let us know if you come up with any good ideas. I was thinking about relocating the sensor down into the coolant path. I'm not sure if that's possible. I haven't really spent any time looking at it since I decided to do it. __________________ Old Slow GT New Slow GT--> under construction Latest Addition: 95 Cobra R, #73, bone stock, ~6100 miles.

09-05-2002, 04:01 PM	#4
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	just use a U shaped piece of tubing and tighten down the hose clamps I was working on something on my car a couple years back and accidentally BROKE one of the tubes off of the heater core going into the firewall. It was summer so I just pulled that tube out (about a 90deg bend in it) and used it to bypass the heater core. It worked great until november and I needed to use my defrost __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

09-05-2002, 04:03 PM	#5
silver_pilate DURKA DURKA!! Join Date: Sep 1997 Location: Lubbock, TX...(TX panhandle) Posts: 1,418	You can buy male-male connectors with different sizes on either end. That's what I did until I decided to replace the core. --nathan __________________ '91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back. Daily Car: '04 Infiniti G35 Sedan 6MT

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Heater Core leaking already!	429mustang	Windsor Power	2	07-30-2004 09:05 AM
Heater Core	kmauldin	Modular Madness	0	10-08-2003 07:37 AM
I need help ( heater core ) 89' 5.0	fms89	Windsor Power	7	05-30-2003 07:31 PM
heater core question	82 GT	Windsor Power	9	10-17-2002 05:38 PM
Heater Core Removal	65mustang-man	Classic Mustangs	2	09-17-2000 01:32 AM