Question about 1991 Honda Accord

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My heater went from hot to cold

The water level on my 91 accord got really low due to a crack. When the car starting getting hot I stopped and realized water was really low I filled it up and for about 6 miles every thing seemed normal and then all of a sudden the Heater went from hot to cold and temp. guage started rising. What would cause that. Note that I had not change the radiator fluid since I got the car in Oct.93. Might the sludge in the bottom of the radiator clogged the thermostat or what

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  • crownbuilder Jan 31, 2009

    Ok well I changed the radiator and the thermostat the but now the car is still getting hot, but if I put the car on a decline the temperture will go to normal. Could this be the waterpump or something else

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Either you have a air pocket in the cooling system or the engine got to hot and hurt the head gasket .while engine is cold check level if low fill up slowly if full start car with radiator cap off is coolant spews out of radiator then look to the head gasket remember coolant should me cold!!

Posted on Jan 30, 2009

  • mike loshbough
    mike loshbough Feb 01, 2009

    the water pump is drivin by the timing belt and fin are metal is pump was bad it would over heat on a decline.do you have heat on decline.if you do and heat is fine low coolant still. or a air pocket?try putting car on decline rev engine to 2000 rpms for 3 minutes.if heat is good slow to idle with a rag CAREFULLY AND SLOWLY TAKE OFF RADIATOR CAP.SEE IF COOLANT IS LOW ON FLAT SURFACE.THE SHOULD TAKE OUT AIR POCKET.

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Posted on Jan 02, 2017

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1 Answer

Why does heater blow lukewarm air that turns cold?


An air bound heater core can cause this. A thermostat issue would cause it to overheat quickly (stuck shut) or cause the engine to take a long time to get up to normal operating temperature (stuck open).

Try this after the car has sat over night and is COLD.:

Top off the coolant RESERVOIR to the COLD MARK with a 50/50 mix of coolant and water when the engine and coolant are COLD. Replace the reservoir cap.

NEVER open the radiator cap when hot!!

Open RADIATOR cap - WHEN COLD - and top off radiator with the same 50/50 mix of coolant and water to just under the inner lip of the filler neck.

Start engine, turn heat to HOT and FAN to HIGH.

Watch the coolant level in the radiator. Maintain the level of coolant as close as possible to just under the filler neck lip. It is expected to fluctuate up and down as the thermostat opens to flood the radiator - and be pulled into the engine block. The more variation in the high and low indicates a fair amount of coolant has been lost. After the engine has gotten hot, you should feel hot air coming from the heater. Check the radiator level once more, top off and replace the radiator cap.

If still no heat, there may be a clog or restriction in the heater core hose. A cooling system flush should fix this, but can cost a few bucks at a Jiffy Lube or similar.

If you're losing coolant - that could be an indication of a leak (see puddles where you park?) due to a bad hose clamp or hole in a hose ($) or a bad gasket ($$$) or cracked engine block ($$$$). Look for white "smoke" (steam really) in the exhaust after the engine has warmed up to indicate that the coolant is entering a piston due to a gasket or block issue.

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If the thermostat where stuck open you would notice that the temp gauge would read low. If the water pump was not working correctly the vehicle would be overheating.

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