do away with heater hoses?
Melting Slicks
Joined: Oct 2004
Posts: 2,662
Likes: 8
From: Knoxville Tennessee
There is no change in engine temperature whether or not there is coolant flowing thru the heater core. If the heater shutoff valve on vettes worked the way they should the flow of coolant is stopped anyway. Many of us have installed shutoffs on the heater hoses because the original shutoff doesn't work properly, or stops working, or the vaccuum line fails.
Bernie
Bernie
Melting Slicks
Joined: Oct 2004
Posts: 2,662
Likes: 8
From: Knoxville Tennessee
Whayne,
You are correct. Running your heater fan with coolant going thru the heater core will help cool the engine. But if you have to do that there is a more serious problem that needs to be addressed. I can remember when cars did not have heaters and then they were options. The only reason they were added was for creature comfort. The loop in the system to provide heated coolant to the heater was installed for that purpose only. A side benefit was exta cooling capacity for the engine. But that was when cooling systems were not adequate to do the job.
Bernie
You are correct. Running your heater fan with coolant going thru the heater core will help cool the engine. But if you have to do that there is a more serious problem that needs to be addressed. I can remember when cars did not have heaters and then they were options. The only reason they were added was for creature comfort. The loop in the system to provide heated coolant to the heater was installed for that purpose only. A side benefit was exta cooling capacity for the engine. But that was when cooling systems were not adequate to do the job.
Bernie
Instructor
Joined: Apr 2005
Posts: 101
Likes: 0
From: webster ny
water valve
I could be wrong here, but on my 79 vette, I think I have a coolant valve that is in series with one of the heater lines going to the heater core. The valve has a vacuum line on it that opens/closes the switch depending on your selection of AC or heat. Would this not stop the flow of coolant to the heater core sufficient enough to prevent having to use manual valves described in earlier posts?
By the way if anyone is familar with this valve - I can not find the vacuum line that should be connected to it - any ideas? I did find a 3 foot long section of white thin tubing, but it will not fit on to the water valve. Not sure what this tubing is for but it was near the valve, tangled with my firewall harnesses. Thanks,
Hef
By the way if anyone is familar with this valve - I can not find the vacuum line that should be connected to it - any ideas? I did find a 3 foot long section of white thin tubing, but it will not fit on to the water valve. Not sure what this tubing is for but it was near the valve, tangled with my firewall harnesses. Thanks,
Hef
Burning Brakes
Joined: Aug 2004
Posts: 971
Likes: 7
From: roanoke va
Originally Posted by BerniesVette
The loop in the system to provide heated coolant to the heater was installed for that purpose only.
Bernie
Bernie
do you think the car manufactures would still install bypass hose's on cars and trucks if it was no benifit. no they would save that money.
as i said before the bypass is to improve heat transfer. i did not say it would cause the engine to overheat. the water in the engine block is circulated thru the bypass or heater core causeing the coolant to be a more uniform temp.
Melting Slicks
Joined: Oct 2004
Posts: 2,662
Likes: 8
From: Knoxville Tennessee
Hef,
The valve you are referring to is your heater control valve or shutoff valve. It is supposed to have a vaccuum line running to it to open or close it. That vaccuum line runs from the top middle of your firewall out of a rubber plug that has either 3 or 4 holes in it for other vaccuum lines. If your vaccuum line is missing, I would suspect your valve is allowing hot coolant into your heater regardless of the position of your switch. This is the exact reason so many have installed manual shutoffs on their heater hoses. But working, properly, that is the valve that stops the flow of heated coolant to the heater.
Wills670,
My comments were made to reflect cars that did not come from the factory with bypass systems on them. I understand the reason for them on those vehicles and does make sense. Would this system help our concerns with temp issues on C3's? It would prpbably be worth trying but for my personal car with its current requirements doesn't need it. I am for improving the performance, comfort and reliability of these cars any way we can. If a bypass works, it wouldn't be that hard or expensive to install. Thanks for reminding me we are in the 21st century.
Bernie
The valve you are referring to is your heater control valve or shutoff valve. It is supposed to have a vaccuum line running to it to open or close it. That vaccuum line runs from the top middle of your firewall out of a rubber plug that has either 3 or 4 holes in it for other vaccuum lines. If your vaccuum line is missing, I would suspect your valve is allowing hot coolant into your heater regardless of the position of your switch. This is the exact reason so many have installed manual shutoffs on their heater hoses. But working, properly, that is the valve that stops the flow of heated coolant to the heater.
Wills670,
My comments were made to reflect cars that did not come from the factory with bypass systems on them. I understand the reason for them on those vehicles and does make sense. Would this system help our concerns with temp issues on C3's? It would prpbably be worth trying but for my personal car with its current requirements doesn't need it. I am for improving the performance, comfort and reliability of these cars any way we can. If a bypass works, it wouldn't be that hard or expensive to install. Thanks for reminding me we are in the 21st century.
Bernie
Instructor
Joined: Apr 2005
Posts: 101
Likes: 0
From: webster ny
cut off valve
Originally Posted by BerniesVette
Hef,
The valve you are referring to is your heater control valve or shutoff valve. It is supposed to have a vaccuum line running to it to open or close it. That vaccuum line runs from the top middle of your firewall out of a rubber plug that has either 3 or 4 holes in it for other vaccuum lines. If your vaccuum line is missing, I would suspect your valve is allowing hot coolant into your heater regardless of the position of your switch. This is the exact reason so many have installed manual shutoffs on their heater hoses. But working, properly, that is the valve that stops the flow of heated coolant to the heater.
Wills670,
My comments were made to reflect cars that did not come from the factory with bypass systems on them. I understand the reason for them on those vehicles and does make sense. Would this system help our concerns with temp issues on C3's? It would prpbably be worth trying but for my personal car with its current requirements doesn't need it. I am for improving the performance, comfort and reliability of these cars any way we can. If a bypass works, it wouldn't be that hard or expensive to install. Thanks for reminding me we are in the 21st century.
Bernie
The valve you are referring to is your heater control valve or shutoff valve. It is supposed to have a vaccuum line running to it to open or close it. That vaccuum line runs from the top middle of your firewall out of a rubber plug that has either 3 or 4 holes in it for other vaccuum lines. If your vaccuum line is missing, I would suspect your valve is allowing hot coolant into your heater regardless of the position of your switch. This is the exact reason so many have installed manual shutoffs on their heater hoses. But working, properly, that is the valve that stops the flow of heated coolant to the heater.
Wills670,
My comments were made to reflect cars that did not come from the factory with bypass systems on them. I understand the reason for them on those vehicles and does make sense. Would this system help our concerns with temp issues on C3's? It would prpbably be worth trying but for my personal car with its current requirements doesn't need it. I am for improving the performance, comfort and reliability of these cars any way we can. If a bypass works, it wouldn't be that hard or expensive to install. Thanks for reminding me we are in the 21st century.
Bernie
Kevin
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Melting Slicks
Joined: Oct 2004
Posts: 2,662
Likes: 8
From: Knoxville Tennessee
Hef,
If I remember correctly, you can leave the stock valve on as it is normally open, vaccuum pressure keeps it closed. Just install ball cocke valves on both hoses and you will be set.
Bernie
If I remember correctly, you can leave the stock valve on as it is normally open, vaccuum pressure keeps it closed. Just install ball cocke valves on both hoses and you will be set.
Bernie
