heater core bypass?

[ECONORAM]

I'm not sure if my heater hose mod is what you have in mind, but here goes. I bought a Four Seasons valve from Autozone a couple years ago and spliced it into my heater hoses. With it I can let coolant circulate as normal, or I can return coolant directly back to the system and bypass the heater. It's actually a factory Jeep part, vacuum actuated. I did it to improve my air conditioner performance, not to speed warm ups.

[brent777]

Originally Posted by ECONORAM

I'm not sure if my heater hose mod is what you have in mind, but here goes. I bought a Four Seasons valve from Autozone a couple years ago and spliced it into my heater hoses. With it I can let coolant circulate as normal, or I can return coolant directly back to the system and bypass the heater. It's actually a factory Jeep part, vacuum actuated. I did it to improve my air conditioner performance, not to speed warm ups.

thats sweet man that sounds great thanks

[ECONORAM]

Four Seasons 74809. Here's a thread at DodgeTalk from my install notes... DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums

[t vago]

Sounds similar to what I did with my truck. I used a Four Seasons 74777, though.

All of the heater valves I've come across will allow some seepage past the valve itself. I suspect this is intentional, so as force all of the coolant to stay at a uniform mixture. For bypassing the heater core, the seepage isn't enough to really affect discharge air temperatures coming out of the HVAC housing.

However, for fully shutting off coolant flow, such as with my HAI setup, these valves are not quite adequate.

[brent777]

Originally Posted by t vago

Sounds similar to what I did with my truck. I used a Four Seasons 74777, though.

All of the heater valves I've come across will allow some seepage past the valve itself. I suspect this is intentional, so as force all of the coolant to stay at a uniform mixture. For bypassing the heater core, the seepage isn't enough to really affect discharge air temperatures coming out of the HVAC housing.

However, for fully shutting off coolant flow, such as with my HAI setup, these valves are not quite adequate.

how much quicker sis your truck warm up?

[oil pan 4]

What ever you do, do not block or disable any coolat bypasses.
If you want to bypass the heater core, go for it, wont hurt anything.

[brent777]

Originally Posted by oil pan 4

What ever you do, do not block or disable any coolat bypasses.
If you want to bypass the heater core, go for it, wont hurt anything.

Oh why can't I? I did bypass the TB one time and it didn't hurt anything but I didn't see a inprovement so ya. But will it hurt anything if I bypass the heater core????

[oil pan 4]

Originally Posted by brent777

Oh why can't I? I did bypass the TB one time and it didn't hurt anything but I didn't see a inprovement so ya. But will it hurt anything if I bypass the heater core????

You may bypass the heater core, TB or anything.

The idea is to keep coolant circulating.

The vehicles that have the heater core valve, most of the time its a 3 way valve so even if coolant isnt going through the heater core its still circulating.

[brent777]

Originally Posted by oil pan 4

You may bypass the heater core, TB or anything.

The idea is to keep coolant circulating.

The vehicles that have the heater core valve, most of the time its a 3 way valve so even if coolant isnt going through the heater core its still circulating.

oh okay and when i do the bypass it will be a 3way valve thanks for the input :

[t vago]

Originally Posted by brent777

how much quicker sis your truck warm up?

It's hard to say how much warmer my truck would warm up with the bypass, as I've never really tested it. I installed my heater core bypass to make my A/C put out colder air.

For some engines, one can get away with using a two-way valve. However, that presumes a good understanding of one's engine internals. For instance, on my truck's engine, there's already an internal bypass between the heater supply port and the heater return port.