heater hoses
heater hoses I'm in the process of running heater hoses. I read that a "H" pipe should be put in before the heater vavle so that there is always coolant moving around the t-stat when heater vavle is closed. What is everybody else doing, "H" pipe or no "H" pipe? Issues with or without "H" pipe? Thanks
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
No H pipe in my setup. I drive it everyday and have 11,000+ miles so far. The only thing I have noticed is that the heater does not throw as much heat out as when I had the 305 SBC.
Hi mjls1, how i your camaro coming?
I did not use a H pipe either and never had any problem with my setup. I think I remember seeing the thread where someone was having the problem you described and he cured it with a H pipe. He had the problem because of the HVAC unit he was using.
I did not use a H pipe either and never had any problem with my setup. I think I remember seeing the thread where someone was having the problem you described and he cured it with a H pipe. He had the problem because of the HVAC unit he was using.
Hi schitzo, I think he had installed a classic auto air unit. I'm using the same a/c set up. Just not sure if I needed "H" pipe or not. I recently got the car running . Started right up. I could not of done it without this board! Now to decide what color to paint it...
Staging Lane
Joined: Nov 2005
Posts: 63
Likes: 0
From: Latrobe PA
You only need a tee if you have a heater control valve. The valve will shut off the coolant flow through the heater core when the air is on. These are very common pieces in older chevy's even up into the 90's. On the LS1 the t-stat will not get coolant flow over it without heater core flow so a small tee can be used in the heater hoses to allow the coolant to circulate over the stat. I would just not use a heater control valve unless you are running hot with the air on, then the valve ann help a little.
Andy
Andy
TECH Resident
Joined: May 2004
Posts: 792
Likes: 2
From: SoCal
This subject was brought up once before, and I questioned whether the heater valve was a bypass type (keeps coolant flowing back to the water pump when in the closed position). Someone anwered by saying "look at the heater valve." Well, I don't have a late model (98-02) heater valve to see if it is a bypass type. Anyone?
I know the stock thermostat has 4 holes in the diverter to presumably keep some coolant flowing in order for the thermostat to see when the water gets hot. The diverter also is on a spring to presumably bypass incidental high pressure water under higher RPM's when the thermostat is still closed.
Andy1
I know the stock thermostat has 4 holes in the diverter to presumably keep some coolant flowing in order for the thermostat to see when the water gets hot. The diverter also is on a spring to presumably bypass incidental high pressure water under higher RPM's when the thermostat is still closed.
Andy1
Trending Topics
Originally Posted by LS1RS89
You only need a tee if you have a heater control valve. The valve will shut off the coolant flow through the heater core when the air is on. These are very common pieces in older chevy's even up into the 90's. On the LS1 the t-stat will not get coolant flow over it without heater core flow so a small tee can be used in the heater hoses to allow the coolant to circulate over the stat. I would just not use a heater control valve unless you are running hot with the air on, then the valve ann help a little.
Andy
Andy
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Staging Lane
Joined: Nov 2005
Posts: 63
Likes: 0
From: Latrobe PA
Originally Posted by mjls1
It has the heater control valve and shuts the coolant off to the heater core. I talked to the manufacturer a while back and they said they had no known issues with this problem. But I have read that some are having touble with running hot as soon as shutting the valve. The heater hoses are 5/8". My next question is if I use a "H" pipe, what diameter pipe should be used for the center (cross over) pipe? Smaller like 1/2" or same size 5/8"? Thanks
Andy
