Question about 1990 Cadillac Fleetwood

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I can't get heat through my heater or dashboard vents. I had the thermostat and hoses replaced and lines are all hot; appears problem is vents arn't opening. Is there a switch or are these vacume controlled? Any suggestions?

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Your heater core is bad it's located under dash passenger side near blower motor behind plastic cover. Check and see if passenger floor is wet or damp if so for sure sign.

Posted on Jan 04, 2011

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1 Answer

I have a problem with cold air from heat vents.


The bypass valve may be stuck open. Try working it manually to see if it is sticking . Valves are usually vacuum or electric . If vacuum actuated, check vacuum lines for cracks or holes. If electric, make sure wiring is intact and properly connected. You may be able to disconnect acuator and manually open valve. Valve may need to be replaced also.
Hope this helps.
Bob

Dec 16, 2014 | 2004 Hyundai Elantra

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I have a problem with cold air from heat vents.


Replace the thermostat. When the engine is hot. There isn't a hose on it that you can hold for more than a couple seconds. 200+ degrees.

Dec 16, 2014 | 2004 Hyundai Elantra

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Chrysler sebring no heat


If the heater core lines are hot but the core isn't, the problem may be a clogged core.

Dec 18, 2013 | Cars & Trucks

2 Answers

No heat ,


Check the vacuum lines to make sure they are correctly connected and in good shape. If they are not, then the system wont move the dampers to allow hot air into the heat vents. A second possibility is a clogged heater core, which is not allowing hot water to circulate through it. As you say the head has been replaced, I would have someone insure every thing was reconnected correctly. It could be the hoses to the heater core are reversed!

Jan 18, 2013 | 2000 Ford Taurus

3 Answers

1998 chevy blazer After the repair shop replaced the blown intake gasket, I have no heat from the heater. I took the heater hoses off and ran water thru the heater but still no heat


Is the vehicle running at normal temperature..If its running cooler than normal,then it might be the thermostat..Feel the upper radiator hose after the vehicle hot..It should be hot to touch

Sep 05, 2011 | 1998 Chevrolet Blazer

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ONLY WARM AIR FROM HEATER, REPLACED THERMOSTAT, STILL ONLY WARM AIR. UPPER RADIATOR HOSE & HEATER CORE HOSES ARE HOT.


The next possibility, if you haven't already thiught of it, is as simple as making sure there is enough water/antifreeze solution in your radiator. If the level is too low, your hoses will get hot, but there will not be enought water to circulate into your heater core.

Dec 17, 2010 | Ford F-150 Cars & Trucks

1 Answer

Heater does not work


Seems like very little volume of water is reaching the heater core in the dashboard. Check the hoses that run from the cooling system into the firewall. One of these hoses might be bent or creased in a position that it impairs the normal flow of hot water into the dashboard.

Dec 13, 2009 | 1996 Honda Accord

1 Answer

No heat is there a fuse 2003 f250 is there a fuse for heater


i don't know realy if there is a fuse (though i doubt it) but issues with heatting may be this will help.

If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.
Remove it and install a new unit (most radiator shops will not repair a leaking heater core.
If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
  • If flushing fails to remove the blockage from the heater core, the coremust replaced.

Nov 27, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

Heater not working (no heat)


If u have issues with heatting may be this will help.

1- If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.Remove it and install a new unit (most radiator shops will not repair a leaking heater core.

1 - If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
  • If flushing fails to remove the blockage from the heater core, the coremust replaced.

Nov 19, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

Heater wont get hot


it has a valve on the heater hoses on one hose that has a vacuum line running to it check both sides of the hose on each side of the valve if its hot both sides its ok. Then check to see if both hoses are hot this will mean that the water is flowing ok if its not reverse the hoses on the heater core somehow it will flush the core out. If this is all working then its the door on you heater box not closing the air conditioning hole off . It goes through the same vents as heater

Dec 16, 2008 | 1998 Dodge Ram 1500 4WD

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