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1976 chevy k10 350cdi base model no ac.will not warm up upper radiator hose gets hot heater lines both get hot but lower hose stays cold. changed thermostat filled till full ran air out of system no c

1976 chevy k10 350cdi base model no ac.will not warm up upper radiator hose gets hot heater lines both get hot but lower hose stays cold. changed thermostat filled till full ran air out of system no change.still blows luke warm heat. system presurizies cap checks out no clue what to try now?????

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  • Cars & Trucks Expert
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Put a new radiator in, you can get them on ebay shipped to you for under 100 bucks, thats with shipping brand new! better safe than sorry, and always check mixture of antifreeze, i am in wisconsin so i run straight antifreeze, i never worry about anything freezing up and i been doing this for years... if you are in a warm state, then mix as recomended

Posted on Mar 02, 2015

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  • Cars & Trucks Master
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It sounds like you have a blockage in the system and by the description it sounds as if it is the heater core. The best advise I have is to pull the heater hoses off of the heater core and blow backwards into the core. Next would be to make sure the hoses both heat up, the top and the bottom.

Posted on Dec 06, 2014

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Posted on Jan 02, 2017

JMMARRERO59
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SOURCE: 1998 Dodge Durango no heat when using heater.

BLEND DOOR STUCK OR BROKEN. NEEDS TO REMOVE DASH AND HEATER/EVAP CORE BOS TO REPAIR REPLACE.

Posted on Jan 08, 2009

  • 3 Answers

SOURCE: 04 civic heater blows cold air at idle

you should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.

Posted on Jan 18, 2009

  • 108 Answers

SOURCE: Air, no heat '98 Astro. No leaks, engine

It sounds to me that you may have 2 problems. 1). Air Lock in the Heater Core. 2). Inactive Heat Damper in the Plenum.

But since you state that the Heater Hoses do not get warm that is indicative of an Air Lock in the Heater Core. This is a relatively simple fix. It is best performed COLD but requires a method of pressurizing the Cooling System. All reputable Auto Parts stores Sell and/or Rent Pumps that temporarily replace the Radiator Pressure Cap for Leak tests and curing Air Lock. The Collant Level must be filled FULL then pressurized and then loosening the Highest Heater Hose at the Firewall so that Air and a Small Amount of Coolant escapes. Once all the Air has escaped tighten the Heater Hose Clamp, remove the Pressure Pump, Restore the Collant Level to FULL, re-install the Pressure Cap and Start the Engine. As it Warms up you should be able to feel coolant running through the Heater Hoses and they should become warm.

Posted on Dec 07, 2009

  • 30 Answers

SOURCE: Heater blows only luke warm air.

check control swicth

Posted on Feb 12, 2010

  • 65 Answers

SOURCE: Ok, g35 coupe 06,52k miles Had

Heres a couple of things you can check. Start your car and remove the radiator cap,(before it gets hot mind you) when it reaches norm operating temp, look inside radiator to see if water is circulating. If its not moving, its a bad water pump. Also, youre hoses should never collapse, if they collapse when they get hot maybe you need new hoses? Finally, if those dont work, flush out your radiator. Open the bottom cockpit and use a garden hose and let it flush out the system while the car is running, about 10 mins should do the trick. If the radiator looks clean inside then it doesnt need flushed.

Posted on Jan 04, 2011

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The heater on my 98 ford expidition blows hot air at first and then blows only Luke's warm. If I shut heat off and turn back on it will blow hot and then turn Luke warm why


-Sounds like the system is clogged or the on off valve is not open
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-Check the valve and flush the system. It should be good to go.

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Mai

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1 Answer

1976 chevy k10 350cdi base model no ac.will not warm up upper radiator hose gets hot heater lines both get hot but lower hose stays cold. changed thermostat filled till full ran air out of system no...


Check to see if the lever activated by the temperature control cable is actually moving when you move the control. Maybe a stuck valve in the heating system.

Dec 05, 2014 | Cars & Trucks

1 Answer

Heaters running cold at 90 degrees


If the engine is running at a normal temperature I would suspect the thermostat.
Normally from a cold start the coolant should only circulate through the bypass hose, the heater matrix, and back through the engine, As the engine warms up and the thermostat begins to open the coolant is directed through the main radiator - at this point you will be able to feel the upper and lower radiator hoses warming up.
If the thermostat is faulty and permanently open you will be able to feel the upper and lower radiator hoses warming up very soon after starting the engine and at the same time as you feel the heater hoses begin to warm. This causes most of the heat to be radiated away and so the heater will never warm up.
Unfortunately the thermostat is hidden underneath the water pump on a passat and requires the cooling system to be drained before it can be changed. It may also require the power steering pump to be removed to get access to the thermostat cover.

Feb 01, 2014 | 2001 Volkswagen Passat

1 Answer

2003 windstar blows luke warm air not hot


Temp gauge should read about 1/2 way if the vehicle engine is at proper operating temp. If it is lower it is why you have luke warm heat. If the temp is ok get the climate control system scanned for faults.

Dec 19, 2013 | 2003 Ford Windstar

1 Answer

98 grand cherokee little heat.heater hoses hot top rad warm bottom is cold collant barely luke warm


While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.

Nov 14, 2013 | 1998 Jeep Grand Cherokee

2 Answers

Heater doesn't get hot on 96 chevy truck. Blows good, just cold. Replaced thermostat, flushed radiator. Any ideas?


Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Dec 06, 2012 | Cars & Trucks

2 Answers

Engine overheat and no heat


Maybe your radiator is clogged.

Mar 12, 2017 | 2001 Nissan Sentra

1 Answer

95 jeep cherokee heat


Both of the hoses at the heater core should be hot. If one is cold the heater core is plugged. You can think of it this way. If the thermostat was stuck closed and you checked the upper and lower radiator hoses with the engine hot the upper hose would be hot and the lower hose would be cool because there is no flow. If you check the hoses with a properly working t-stat both hoses will be hot when the t-stat is open and coolant is flowing. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

Jan 21, 2012 | Jeep Cherokee Cars & Trucks

1 Answer

My heat does not work properly


sounds like you have an air lock in the system, look for a bleed screw on hose or pipe.
when vehicle is cold remove coolant resevoir cap and fill with the bleed screw loose until coolant comes out of screw.Then tighten screw refit cap and run engine.
if unable to find bleed screw raise the front of vehicle as much as possible and top up coolant.

Jan 03, 2012 | Cars & Trucks

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