Question about 1991 Cadillac DeVille

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How to clean or blow out the heater core - 1991 Cadillac DeVille

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There should be 2 rubber hoses going into the firewall and into the car. If factory they will have spring clamps just like on the radiator hose. Remove both lines. Then get a hose and put it in one line and run the water until it comes out clear. Then do the same thing with the other side. Do this a couple of times. Then reconnect the 2 hoses and check the level of the radiator. Then start the car with the radiator cap off and wait a while for the thermostat to open and have the heater on so it will cycle through the whole system. Then top off as needed. Hope this helped Tim

Posted on Nov 13, 2010

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How to flush a gmc heater core


Dear Tim
Disconnect the heater hoses from the engine block.
Using some steel or plastic pipe of the right diameter to fit inside the hoses.
Clamp the pipes inside the hoses, and attach a garden hose or a compressed air hose to the pipe to blow the heater core clean. Remember, the normal pressure that the core is designed for is about 15 # per square inch, so either normal household water pressure or an air compressor can blow the core to pieces, so be REALLY gentle whilst blowing it out.
God bless your efforts.

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Car heater


not necessarily . You may need a new heater control ( tap ) so that the hot water can flow through the core of the heater. The core fins can be cleaned out with a vacuum cleaner.

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HEATER ISN'T BLOWING HOT AIR


Sounds like a restricted heater core. Remove the hoses and back-flush the heater core system with a water hose. You may want to do a complete cooling system flush while you're at it.

If you can't flush the heater core clean with a water hose, it may be time to replace.

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2001 sebring blows hot air then after approx 20 mins blows cold air. Temp gauge inside car only goes up to about 1/4 mark.. any ideas? Had coolant system flushed.


Sounds like maybe a stuck thermostat. or a blocked heater core. Just cause the system was flushed dosent mean the heater core was cleaned out.

Dec 30, 2011 | Chrysler Sebring Cars & Trucks

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Celica vvti 140 52reg heater blows cold


once engine is hot
all cabin setting set to heat
check hoses going into cabin from engine - are they hot if not check - engine thermostat.
flush cabin heater core with water from garden hose - through both core hoses one direction then the other - to clean out core.
check vacuum doors in heater core box in passenger compartment.

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88 bronco II, heater hose going to water is cold, and my heater blows cold air, is my water pump going bad? the return heater hose is warm, it was heating once in awhile now it don't heat at all just cold...


I would try flushing heater core to see if it's plugged. I don't think it's waterpump, your rig would be overheating if it was. Leaking is most common waterpump failure.

Mar 06, 2011 | 1988 Ford Bronco II

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I have a problem with the heat in my 99 4 runner. It takes a long time to heat up and reach normal operating temps, and even longer for the heater to start blowing out warm air. The worst problem is if the...


When was last flush and thermostat replaced? Also, it may sound crazy but, when I have a partially clogged heater core, which I suspect you do, I usually will disconnect the hose at the heater core, and connect a drill operated pump from hardware store (about $10) to the heater core, and circulate C.L.R through it before putting it all back together. I usually set it up to pump through the core and back into a pail or similar, and then reverse the hoses to allow flow opposite way as well, then I plug lower inlet to core, and fill with C.L.R, and let it sit overnight if I have time, just to clean out as much calcium clogged up in there as I can. Saved me replacing 2 or 3 heater cores so far, that had little or no heat at idle, prior to cleaning, but had good heat after.

Dec 22, 2009 | 1999 Toyota 4Runner

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My dodge dakota doesn't blow hot air at all. i have replaced the thermostat, water pump, fan, and fan clutch. i had problems with it over heating i've fixed that problem but now living in CO. I don't have...


May be a plugged heater core. OR Someone removed your thermostat to cure you overheating problem. Remove heater hoses , (in and out hoses) leading to and from heater core and try to blow through it. DO NOT clean out using more than 16 p.s.i. as this will burst you heater core.Also check to be sure heater flap is opering to let heated air into cab.

Nov 29, 2009 | 1998 Dodge Dakota

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Does not blow hot air (heat)


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

To attempt to clean the core, you must flush the system multiple times. If this does not work, the core cannot be cleaned and must be replaced.

Jan 16, 2009 | 1995 Jeep Grand Cherokee

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