Question about 1995 Pontiac Grand Am

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I put coolant in radiator and I get a/c but my heat doesn't work. I think my heater hose was bypassed by the previous owner. How do I fix the problem?

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You should be able to look down in between the motor and the firewall and see if the heater hoses are attached to the heater core. Most of the time when they are bypassed it is because the heater core has started to leak. Instead of replacing the heater core (not a fun or easy job) they just bypass it so they won't leak coolant. So, if it is bypassed your probably looking at replacing the heater core in order to get heat.

Posted on Nov 09, 2010

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Posted on Jan 02, 2017

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Heater will not blow hot air


First of all the engine has to be running (and warmed up) - On a cold morning this could take several minutes.

Secondly, after allowing for the engine to warm up and with the knob turned to heat and the blower turned on, place your hand over other vents in the car, such as the air conditioning vent and the defroster vent. Still no heat??

Possible problem: Check the radiator to make sure you're not low on water (coolant). If the coolant level is OK, the most likely problem would be that your thermostat may be stuck open (very common). In most cars the thermostat is (usually) located under (inside) the water inlet somewhere on top of the motor, where the upper radiator hose connects to the top of the engine, You will need tools (a socket wrench & possibly a screwdriver) to access this. In putting it back together you are also likely to need a new thermostat gasket and possibly some gasket sealer. The counterperson at your local auto parts store can likely give you some additional pointers on this & perhaps even recommend someone who can do it for you cheap.

Another possible problem (if you bought the car used from someone) is that the heater core may have gone bad and developed a leak, Rather than fix it, a previous owner may have disconnected the heater hose (under the hood) and bypassed it. - this is not likely, but just something else to check. If this turns out to be the problem, have your checkbook ready...

Hope this helps.

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2002 Subaru Forrester no water in radiator and passenger side floor wet


Donna, your mechanic is both right and wrong. The heater for pretty much all cars comes from the hot coolant running through a heat exchanger (core) under your dash. This is the same coolant that runs through your radiator. Yours sprung a leak in the heater core under the dash - ergo, coolant in the pax floor and none in your radiator. Using a hose to bypass the heater core is a cheap way to avoid a very expensive repair. The downside is that you will have no heat for the car or to blow warm air on the windshield to remove "fog" - a safety issue. This is also a dumb idea if you live where winters are frigid. In summertime, what your mechanic suggested is a reasonable, temporary fix. In the wintertime, not so much.

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99 ford mustang 6 cylinder. Recently i had to add antifreeze to my car couldn't find the radiator drain to take some of the water out so i loosened the lower coolant hose to drain some out after...


replace any soft hoses.
collapsed hoses cause water flow constriction
.that increases temp fast

to bleed air out of the system . if no air bleeder as such
with heater on full .-engine running
loosen the bypass pipe for the closed thermostat till only coolant flows no air bubbles
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LOOKING AT HEATER CORE TOP HOSE COOLANT FLOW IN BACK OUT THROUGH THE BOTTOM HEATER CORE HOSE CHECK WATER PUMP BYPASS HOSE SEE IF IT GETS HOT.IF NOT COULD BE BLOCKAGE AT BYPASS HOSE FROM WATER PUMP OR WATER COULD BE FAULTY GETTING TOO WEAK PUMP COOLANT THROUGH SYSTEM.IF COOLANT GETTING HOT GOING TO HEATER CORE THE HEATER CORE AND COOLANT SYSTEM NEED FLUSHING OUT.

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1 Answer

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Too much blockage in heater hoses or heater core.
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Replace with straight-through hose fittings.
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Once the heater starts working, put Tees back in place. You need bypass protection or the engine will overheat.

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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........


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Is your heater core leaking?

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