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Hot to change heater core accord 99 - 1999 Honda Accord

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Posted on Dec 30, 2010

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1 Answer

My Pontiac montana 99 blows cold air,no hot and smell antifrize

likely leaky heater core. May try pellets that GM offers to seal small leaks. Contact dealer or good auto parts store. Rad pellets

Dec 10, 2014 | 1999 Pontiac Montana

1 Answer


A blend door is a plastic door inside the air ducting that moves between the heater core and the AC core to provide the desired ait temp at the outlet, either hot, cod or a "blend" of the two air streams passing over the heater core and AC core..

Feb 18, 2012 | 1997 Honda Accord

1 Answer

My 1995 honda heater is blowing cold wont blow hot.i changed the heater control valve.what am i to do.

try back flushing your heater core find the 2 hoses to the heater and start the motor let it run for a bit feel the hoses 1 should get hot and 1 should be a little cooler the 1 that gets hot is the inlet and the cooler 1 is the outlet remove them after the motor has cooled down and use a garden hose to back flush the core flush water through the outlet you dont need to use high pressure if you do there is a chance the core can crack and leak.

Dec 30, 2010 | 1995 Honda Accord

1 Answer

I changed my heater core in my 99 chevy silverado what a job it still doesnt blow hot air what did i do wrong


Dec 19, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

99 Cavalier. Changed head gasket, heater core, thermostat. Rad flushed. In summer, a/c would freeze up. Now interior heater is only blowing luke warm. Have seen several mechanics, no fix yet.

It sounds like the blend door is jammed, but I would think a mechanic would have checked that. Can you see the door actuator move when you switch between hot and cold?
It could also be the heater water control, which is incorporated into the hose. With the car hot and heater on, feel the temperature of the hoses as they attach to the core at the engine firewall. If the hoses aren't hot, the heater control in the hose has failed closed. Let me know if you have more questions.

Sep 23, 2010 | Chevrolet Cavalier Cars & Trucks

1 Answer

The heat in my honda accord blow warm air.not hot

sounds like you have one of two problems first check at heater core lines going into heater core see if they are hot if only one is warm then it could be the thermostat but honda's have issues with hot water valve cable jamming up this valve is located behind engine near firewall on one of the heater core hoses.

Jan 03, 2010 | 1993 Honda Accord

2 Answers

My 99 Blazer won't blow hot air. The Heater core

The problem was a vacuum line leak. Replaced the line.

Dec 30, 2009 | 1999 Chevrolet Blazer

1 Answer

Heater blow cold air in my 1994 Honda Accord (4

Yes clogged heater core may be the answer in your case .

Dec 11, 2009 | 1994 Honda Accord

1 Answer

Weak heat from my 91 honda accord

SInce your car is approaching 20 yrs of age, it's not surprising that the heater core could be clogged. I assume you have checked for a half-shut inline heater valve (if there is one.) HEre's how to test for the clogged core:

locate two rubber hoses going into firewall and clamped to two pipes protruding therefrom. These are your hoses to the heater core and the spouts running in and out of it. Disconnect the two hoses at some place convenient if not at firewall. Then run water hose into one of these tubes. If you have any backflow, or restriction, then you need a heater core.

If this is not a clogged core, BE SURE your hot/cold cable is pulling it's door or valve to the full hot position. Trace it under dash.

Jan 27, 2009 | 1991 Honda Accord

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