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1990 G-20 Htr core frt bypassed, what is correct routing of

Htr core frt bypassed, what is correct routing of H2O flow? Are there supopesed to be T-fittings and a vacuum controled shut off valve?

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There should be 3 places where the hoses connect on the Tee, see what ones are looped -one into the other, the heater core goes on these 2 in & out, the other goes to the rear air if equipped, such as in a conversion van.

Posted on Mar 10, 2010

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1 Answer

How can I bypass the heater core


not sure if this is what you are after but try this link..
Step 3: Connect the Hoses Together. Use a hose connector or hose coupler to attach the two ends of hose together. That way, the anti-freeze that would be routed through theheater core will instead just go through a short loop of tubing.

How to Bypass a Car Heater Core ' DoItYourself.com

www.doityourself.com/stry/how-to-bypass-a-car-heater-core How can bypass the heater core Google Search

Dec 15, 2016 | Cars & Trucks

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We're the shut off valve on heater core 2004 chevy


Keep looking - there isn't a shut-off valve for the heater core. Water flows through the all the time. The only time you get heat is when you set the controls for it and then cabin air is routed through the core. All other times it bypasses it. If you have a leaking heater core, in most cases you can remove the heater hoses at the firewall and using a hose adapter available at any hardware store with a couple clamps, you can make a bypass loop of the core until you can get it replaced. Of course you have no cabin heat until you repair or replace the core. It is not recommended to stub off the ends of the heater hoses because on some vehicles, that loop provides other cooling functions such as cylinder heads, etc. That is why looping it is the safer choice.

Dec 06, 2016 | Cars & Trucks

1 Answer

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There isn't a shut-off valve for the heater core. Water flows through the all the time. The only time you get heat is when you set the controls for it and then cabin air is routed through the core. All other times it bypasses it. If you have a leaking heater core, in most cases you can remove the heater hoses at the firewall and using a hose adapter available at any hardware store with a couple clamps, you can make a bypass loop of the core until you can get it replaced. Of course you have no cabin heat until you repair or replace the core. It is not recommended to stub off the ends of the heater hoses because on some vehicles, that loop provides other cooling functions such as cylinder heads, etc. That is why looping it is the safer choice.

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My heater doesn't work on my 2000 Intrigue. The blower works and it doesn't overheat. What could be the problem


There are two reasons that could be the cause. The most common is that the blend door in the heater control box is non-operational and is not routing the air from the blower through the heater core. The other possibility is that the heater core is clogged and not getting coolant flow. Actually, a third (more remote) possibility is that if the car is used, a previous owner may have bypassed the heater core if it was leaking. You would have to check the heater hoses under the hood to make sure they are being routed through the firewall and not connect to each other, bypassing the heater core.

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1 Answer

Where is the heater control valve located?


If you are trying to locate some kind of water valve that routes the hot water to or away from the heater core, no such animal exists anymore. Hot water is always routed thru the heater core whether or not you are using the heater. The blend box under the dashboard has flappers that move to route air either thru the heater core, the A/C evaporator, or thru a bypass that routes around both. The blend box allows you to set temperature by adjusting the flappers. It also controls where the air goes; defroster vents, floor vents, or dash vents. If you are not getting heat, the problem is most likely that the blend box flapper is not operating correctly. This could be due to a sticky linkage, a bad vacuum motor, or a faulty control head. You could also have a clogged heater core, or a thermostat that is stuck open all the time. If you are getting heat and don't want it, the blend box flapper is also the most likely cause.

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1 Answer

I have a 1999 Kia sportage and the heat does not work but there is no leak in the core. Is there a bypass valve or something that stops the antifreeze from flowing to it or is the core just clogged up?


My PDF manual shows a coolant bypass pipe. I will try to look for it on my engine, later. If you can remove the hoses that go to and from the heater core, you could try to flow water through them. They may be hard to get at where they go to the core, but try to follow them to where they go in the engine compartment and remove them there. I also know of a situation many years ago in which the coolant lines were reversed going into the core. Once the system went empty during some repair, the core would not refill as there was trapped air, in the core, and the coolant would just flow in through the top pipe and run out the bottom, without flowing through much of the core.

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Bypass - no, it would be like a short for the cooling system, a sure way to overheat the engine. But you can just close it completely by adding another valve on the hose and closing it.

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Is there a bypass on the heater core


Hello bijtj.
There are no bypass hoses on the heater core. Flow of coolant out of the engine and into the core and back to the engine is flowing at all times. The heat inside your car is adjusted by means of a door inside the heater box.
If your intent is to bypass the core because it is leaking you would need to pull the hoses off at the firewall and install a joiner.

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4 Answers

When you bypass the heater core the path for the water to go through the core is gone. Correct?, you have connected to engine water line out to the engine water input? thus bypassing the heater core........


No, you just won't have water flow through the heater core, Coolant flows through the engine through the lower radiator hose as the water pump sucks it out of the radiator and pushes it through the engine. It then flows out the top radiator hose when the thermostat opens. It then flows into the radiator to cool off.

Is your heater core leaking?

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