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What can cause my 1990 eldorado heater to blow only cold air

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  • 129 Answers

Three things .Head gasket water pump .or t stat

Posted on Nov 29, 2012

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Posted on Jan 02, 2017

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SOURCE: 1997 audi A4 heater blowing cold air

You will have to change the heater core. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core.

Posted on Nov 13, 2008

dr_layinlow
  • 60 Answers

SOURCE: 2001 malibu-heater is blowing cold air

sounds like you have a bad temperature sensor in dash or the cable has eitehr broken or come off the heater switch under the dash!!

Posted on Dec 07, 2008

  • 68 Answers

SOURCE: Heater blows cold air

change the heater core

Posted on Dec 21, 2008

dgjtex
  • 405 Answers

SOURCE: Heater wont work in my 1990 Chevy Truck

Several things can cause this (1) low coolant (2) bad coolant valve to heater core.(3) bad damper in duct.

Posted on Dec 27, 2008

alicantecoli
  • 22156 Answers

SOURCE: Ford Expedition 2002 Front Heater blows cold air below 45 MPH

impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat

Posted on Jan 01, 2009

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1 Answer

1997 E350 Eldorado bus passenger heater blowing cold air


There is a separate heater core, like a small radiator, which needs hot water running through it, so when the air blows over it, the air gets hot. It sounds like the diverter valve which sends the hot water to this heater core is not working. It could be a problem with the valve itself, or the relay or switch that controls it, or the vacuum line or device that opens the valve when the switch or relay tells it to open.

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could be your heater core, um try checking the heater assembly in the dash, something may have broke so the heat isn't being switched over, and it is staying on cold. Regularly check the fluids in the motor and top up as needed

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1999 Cadillac eldorado overheating. Changed thermostat, still overheating now with white smoke coming from exhaust. Checked water pump belt, it is there and turning. Cold air blowing from heater, no heat.


coolant leaking into engine probably blown head gaskets. More damage will occur the more you drive it. Unfortunate and expensive repair on a northstar.

Aug 24, 2011 | 1999 Cadillac Eldorado

1 Answer

I have a 1999 Cadillac Eldorado ETC. When I turn the heater on and bring it out the bi-level vents....The driver side blows heat and the passenger side blows ice cold....even with the air cond. turned...


the temperature door inside (there is two one for each side of car) is possibly broken if you turn the blower on low turn the temp on the passenger side from full hot to full cold or vise versa and listen closely for a clicking or snapping sound if this is heard you have a broken door in side then the dash has to come out the air conditioning has to be discharged of refrigerant which has to be done by a facility with a license. if no noise is heard it could be a control head or a motor but the most likely cause is a broken door.

Dec 15, 2010 | 1999 Cadillac Eldorado

1 Answer

What could be causing my heat to only blow cold air?


maybe the heater core is plugged.
some people have been able to put compressed air into the heater hose going to the heater core dislodghing the blockage, but this has the potential of blowing the heater core apart if too much air is used.

Oct 31, 2010 | 1990 Oldsmobile Ninety Eight

1 Answer

No heat


sounds like heater core change it probably your reason.

Jan 10, 2009 | 1992 Cadillac Eldorado

1 Answer

Heater wont work in my 1990 Chevy Truck


Several things can cause this (1) low coolant (2) bad coolant valve to heater core.(3) bad damper in duct.

Dec 27, 2008 | 1990 Chevrolet K1500

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