Question about 1993 Chevrolet Lumina APV

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I have to replace a hose that runs from the top of the waterpump towards the firewall. I am not sure if it is a bypass hose or a heater hose. I have a 3.1 lt eng, 1993. Could you tell me the name of the hose?

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If i'm not mistaken, the one from the top of the pump to the firewall is the heater hose, as the heater is inside the van under the glove box or in the middle of the dash usually, so the heater hose has to go through the firewall, and the bypass hose should go straight to the engine or the rad. Although i'm not 100% sure since i never dismantled a lumina heater and hose assembly, but i rarely seen it any other way on all the cars i did work with and it's also only logical.

Posted on Jul 17, 2009

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2 Answers

How do I bypass the heater core on my 1996 Mercedes c230


Randy, Locate the 2 heater hoses running into heater core,(they will be sticking out of firewall), Cut these heater hoses off by the firewall and use a ribbed brass joiner (hose joiner) of correct size for heater hose and gear clamp both ends. Its as simple as that to bypass heater core.
Show your gratitude and press the helpful button and follow me on fixya for more tips and info.

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Heater blows cold air--where is heater control flap or switch?


These cars are notorious for having blocked heater cores, causing the heater to blow cold air. That's because there is a heater core bypass hose near the firewall that allows the coolant to bypass the heater core. Eventually the heater core fills with gunk and no coolant passes through it. You'll need to disconnect the hoses from the heater core at the firewall and flush the core using a garden hose. Flush both ways till water runs clear. If you can't access the heater core fittings at the firewall, then follow the hoses from these fittings back to the engine and disconnect them at that point and flush from there. If you flush from the hoses in this manner, it is important that you clamp off the bypass hose at the firewall with a vice grip pliers.
Otherwise the flushing water will go through the bypass hose and not the heater core.

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Dec 21, 2015 | 2001 Ford Taurus

1 Answer

Hot heat at idle cool when driving


is there a chance that one of your heater hoses are clogged? or where they connect to the engine are clogged still? sounds like a clogged system. Cracked heater housing? Outside air bypassing the heater coil while driving?

Dec 13, 2013 | 2004 Pontiac Grand Prix

1 Answer

How and what to remove to replace a bypass hose on the heater system


you have two heater hoses going into the firewall of the car; these to to the heater core. follow those hoses to their attach points on the engine.
disconnect one heater hose from the firewall and connect this to the attachment point of the other hose on the engine. or just get a fitting( simply a piece of pipe from an autoparts store) to attach both hose ends ( from the firewall) together, thereby bypassing the heater core.

Aug 19, 2011 | Pontiac Bonneville Cars & Trucks

1 Answer

Water leaking from back of engine compartment toward the firewall passenger side down to side of transmission so my question is it the bypass hose? or something else


More likely the heater hose. Most run back behind the glove box. It could also be a leak in the heater core- normally that would fog the windshield on the inside.

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2 Answers

Can i bypass the heater core?


Yes. You would need to join both hoses from the firewall into a loop to circulate the water back into the engine. You will need to measure the hose sizes and make a connector. You will need to clamp the hoses to the connector.

If you use copper tubing, you should flare the ends to insure a good seal.

May 09, 2010 | 1995 Ford Escort

5 Answers

I am leaking coolant from the rear of the motor? coming from somewhere over the transmission, just pouring out but i cant get to the area to figure out what is wrong. any suggestions?


I HAD THIS SAME PROBLEM AND IT WAS THE BYPASS HOSE THAT GOES INTO THE BACK OF THE WATERPUMP.IT IS AMETAL HOSE AND IS USUALLY ADEALER PART FOR ABOUT $70.00 THERE IS ALSO A O RING THAT COULD BE LEAKING.YOU NEED TO TAKE OFF THE INTAKE MANIFOLD TO GET TO IT.IT IS APRETTY EASY FIX TAKES ABOUT 2 HOURS.

Apr 02, 2010 | 1991 Mitsubishi Montero

1 Answer

Trying to flush the system and bought a prestone flush and fill kit. It as asking me to find the hose that comes from the fire wall to the top of the engine but I am not sure which hose that is


should have 2 hoses side by side running into your firewall they go to the heater core ,trace them out see where they lead to,I think 1 may goto your waterpump

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2 Answers

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Find the 2 hoses that go into firewall, for heater core, remove them & join together with a piece of copper pipe or similar & top up your coolant, you should be o.k.

Jan 09, 2009 | 2001 GMC Jimmy

1 Answer

Where are the heater core hook ups


The heater core is located on the passenger side of the vehicle. If this has been bypass the core is surely leaking. The heater core pipes should be visible from un der the hood, passenger side of vehicle towards the firewall. keep me posted, and keep an eye on that heater core, there is reason for the prior owner not to have heat.

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