Question about 1988 Cadillac Eldorado

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No heat from heater ,a/cond works fine fan blows on heat but no heat,no leakage from core

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Your heater core or control valve is clogged (in the engine compartment attached to the heater core) .. you can replace the control valve and pressure clean the heater core ... you can disconnect the heater hoses and force water backwards (or bothways thru the core, thats one way to clean it .. ... its a good idea to replace the heater hoses at this time ... the control valve may be vacuum operated .. if so make sure you have vacuum in the hose that delivers it (with heater on) (check vacuum hoses) ... if there is vacuum then you could have a leaky vacuum diphram in the valve (replace vavle) .. if the valve is mechanically operated make sure it is acuated when the heater controls are operated ..

Posted on Oct 05, 2009

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Sounds like the air blend door motor problem check vacuum lines to heater unit they sometimes come off or it may have 12v motor that has failed also if its cable opperated may have broken cable to blend door

Posted on Oct 05, 2009

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Try replacing your thermostate it might be stuck open

Posted on Oct 05, 2009

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Sounds like a bad heater core...but check your instrument gauge first.. does it ever get ho... if it doesn't then the thermostat is stuck open. will need new thermostat.

Posted on Oct 05, 2009

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The heater bypass valve is bad.It's located on the heater hose under the hood near the firewall.It looks like a little 3in.diameter black disc with a vacuum line attatched to it

Posted on Oct 05, 2009

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1 Answer

Why is my heater blowing cold


Most likely it is the heater control valve that shifts air from blowing across your heater core to your air conditioner core.

If your fan works and your car is fairly new..meaning your heater core isn't dirty and full of craap...then it is the climate cotrol valve.
If you are lucky, it might be a thermostat that is bad and blocking hot water from entering your heater core. Bottom line, if hot water doesn't circulate thru that little heater core, you won't get heat.
You might be able to look under the hood and grab the hot water lines that go thru the firewall and feed your heater core. If they feel cold to the touch after engine has warmed up, then you aren't getting circulating water to the heater core. If they feel nice and warm, then the heater core is fine, but your climate control valve has closed off the fan that blows across the core to disperse heat into the cabin

Feb 24, 2015 | Cars & Trucks

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We had some subzero weather while I was on vacation. My 2004 Jaguar was parked outside for several weeks. We had another very cold, icy day, and heater did not work. Fan works, rear window defroster...


What is happening here is that the faster the heater blows air through the fan, the more it cools the liquid in the heater core, and so heat output is reduced. The root of the problem is either the engine is not warming up enough, or the heater core, and/or heater core lines, are plugged up, not allowing the water to circulate properly in the heater core. Here is what I would try.

1. Top off the radiator and overflow.
2. Is the engine warming up properly? Is your temperature gauge showing normal temperatures? If it is not, then replace the thermostat.
3. If steps 1 and 2 do not solve the problem, get the vehicle in a shop, locate the heater core lines, take them apart and flush out the heater core. Look for blockages in the fittings. Do a flow test on the core. It may be clogged and need to be replaced.

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Check heater core location for leakage. If no heat is coming out when you have the temp set to hot, chances are you have a blocked heater core. If you smell antifreeze from heater fan, you may have a leak in the box that contains the heater core. Your windows may fog up too, if you keep the heater on for a bit, but this happens more often if the air coming out is warm, or hot. Hope this helps!

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1996 Saturn SL, Heater fan runs fine but no heat. Starts with a tad of heat then blows cold. Any ideas?


The plenum may be cracked, check for air blowing out where it should not, or the blender door is not opening, a cable sheath may have popped loose, or the heater core itself is clogged with leaf debris blocking air flow..

Jan 11, 2012 | 1996 Saturn SL

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I'm looking for the fuse that goes to me heater. the fan comes on but it blows cold air.


Hello
the fan priveds air circulation, not heat. If you have power to the fan, you're good in the fuse department.
As for no heat - did you check the coolant level?
Any check engine lights on?
Have you added anything to the radiator to prevent leakage? (If so the heater core could be clogged or other obstruction in the supply lines to/ from the engine cooling system.)
Best regards
Ck

Nov 14, 2011 | Cars & Trucks

1 Answer

1989 int. cutlass supreme-2.8lt- heater not blowing any hot air, fan works fine,def.,mid level, upper, lower functions work just fine when buttons pushed. When I turn the temp. control down to 60 the...


Your closing in. There is a motor that will open the heater core venting to allow it to blow into the car. Get a heater core install picture from your auto parts dealer or car dealer for specs of where and how it is driven.

Apr 17, 2011 | 1989 Oldsmobile Cutlass Supreme

1 Answer

How can i get the heater core out of my 2006 toyota corolla


Hello, the heater core is a small heat exchanger located inside the truck, similar to the radiator at the front of the truck. Coolant is circulated from the engine through the heater core and back to the engine. The heater fan blows fresh, outside air through the heater core; the air is heated and sent on to the interior of the truck. For Toyota Pick-ups/Land Cruiser/4Runner 1989-1996 check this reference repair guide...



Heater Core - REMOVAL & INSTALLATION
(see Figure 1)
  1. Drain the cooling system.
  2. Remove the heater unit assembly. Have a lot of towels handy for the leakage of coolant that may spill into your interior.
  3. Remove the fasteners securing the core to the unit, remove the plates and clamps. Pull upwards to remove the core from the unit.
To install:
  1. Inspect the core fins for any blockage. Using compressed air, clean them.
  2. Install the core into the unit placing the plates and clamps into position. Tighten the core screws.
  3. Install the heater unit into the vehicle.
  4. Fill the cooling system.
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Thanks

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1 Answer

Fan is blowing cold air only


good day, you may have some heating core issues, anti freeze leakage, have it checked. hope this helps, have a nice day

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HEATER NOT WORKING IN 2001 LEXUS RX 300


you most likely have a bad airmix servo. this happens alot on these. they are expensive to replace too.

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2002 kia sportage temp gauge runs hot while driving


Cheak to see that the coolant fan is operating with the A/C turned on. The fan has to work to help the engine stay cool and help the A/C. When you apply heat on the control it acts to reduce the coolant temp. You will have to get the coolant fan operation checked. This can be :fan motor, fan relay, temp sensor and computer. Good luck

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