Question about 1986 Volkswagen Golf

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Hardly any heat

Coolant clean, control cables appear to function, engine warm and temp ok per dash guage.  One odd observation..metal portion of coolant tube from core to waterpump appears rather flattened as it proceeds between engine block and base area of the distributor....was it designed this way?

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Yes your heater core could just be going out.

Posted on Dec 02, 2008

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2000 acura tl coolant fan after fluid change


New thermostat, installed, saw, new coolant made a little mess filling reservoir, (normal) checked fan fuse for some reason, and condenser fan fuse (xxx ?:), and temp guage, is slightly lower on gauge (than normal?) (disconnected xxxx? quit? a bit? to get to thermosta?.t no dash warning lights have a feeling I popped a relay.

Answer:

ok, you did a coolant service with STAT,

and it failed.

tell us what works right and wrong, symptoms only.

over heating? parked, (fan never comes on)? as it hits 225F?

under heating? ( fan stuck on , up North can cause huge cold engine)

dash gauge stuck low. (thermostat wrong heat range 180f is best. see FSM for spec. on this temp. spec..

Dash guage varies.? oddly (air in system)?

Dash gauge too high.? (Stat put in upside-down or bleed hole (jiggle) not UP side. higher side of mount , trapping air.)

Does something wrong happen only driving?

leaks?

does cap on rad hold 12-14psi pressure, hot.?

if car has fan belts, are they tight? (for sure water pump does)

Nov 19, 2013 | 1994 Honda Civic

1 Answer

My temperature guage stays in the middle, is this ok?


Yes, the temperature gauge should normally stop in the middle, between the cold and hot points on the gauge. When the engine is cold the thermostat will be closed and will keep recirculating the coolant in the engine block until it warms up sufficiently. Then the temperature of the warm coolant will cause the thermostat to open the channel to the radiator to get rid of excess heat, which should stop the coolant from over heating. So the effect of the thermostat keeps the coolant at a fairly stable temperature. When the coolant runs low, it can't transfer enough heat to the radiator and the coolant and engine then over heats. Watch for radiator leaks under your car after you have been driving it. If the coolant goes low again fairly quickly you could have a leak in a hose or the radiator itself.

Apr 19, 2013 | 2003 Mazda Protege

2 Answers

Heater only blows cod air even when engine is warm. changed thermostat. doesnt fog up ad smell like haeter core.


Your car's heater is a life saver in cold weather. Before attempting to repair your car heater, you should understand how your heater system works. First, on this page is an explanation of how the car heater system functions, further down the page are some pointers on heater system trouble-shooting. To warm the passenger cabin of your car, the heating system makes use of excess heat from the engine internal combustion process. A car's engine, in fact, when in operation produces so much excess heat that if the excess heat is not removed, it would destroy the engine. It is your car's cooling system that removes that dangerous excess heat. Some of the excess heat is released through the exhaust. Most of the excess heat is absorbed by a circulating liquid coolant, which is a mix of water and antifreeze. The heated liquid coolant is carried from the engine through hoses to the radiator, which transfers the heat from the coolant to the outside air. That heat transfer lowers the temperature of the liquid coolant, which is then circulated back to the engine to absorb excess heat again. Whereas the radiator is located at the car front grill, the unit that transfers heat to the passenger cabin is located inside the dashboard. This unit is something of a mini-radiator and is referred to as the heater core. Heated liquid coolant circulates through tubes in the heater core and a heater fan blowing across those tubes, as well as through little fins encasing the tubes, directs warm air through heating vents into the passenger cabin. Because your car's heating system works off of its cooling system, heating system malfunctions are often caused by problems in the cooling system. The heater core in your car is similar to the radiator in the front of your car; in fact it looks like a small radiator. The difference is the heater is mounted inside the car and air is blown through the fins of the core. The heater hoses transfer engine coolant from the engine to the heater core, this allows the heat from the engine coolant to be utilized and warm the passenger compartment. When a heater stops functioning determine what type of failure has occurred to execute a repair. We have listed the most common problems below:
heater_core.jpg
Heater Core
Troubleshooting Procedure
  • Step 1: Check Engine Coolant Level - Most cars have coolant reservoirs with opaque white plastic tanks and measuring lines allowing you to see if the coolant is at the recommended level. Coolant expands when heated, and for that reason, most coolant reservoirs have a Full-Cold and a Full-Hot line. If there is too little coolant in the reservoir, you should be alerted to the possibility that there could be a leak somewhere in your car's cooling system. Remove the reservoir cap and add coolant to the Full-Cold line, if a very short time after you refill the coolant reservoir the coolant level is low, there is a leak in your car's cooling system. Engine coolant is used to heat the heater core and if the vehicle is low on coolant the heater core will stop working. The heater cannot produce heat due to the lack of heat from the engine coolant. Even if the engine is not over heating the coolant level can still be low. Inspect the engine coolant level in the coolant reservoir tank; coolant level should be between the hot and cold marks. Always check the coolant level when the vehicle is cold, preferably over night. Check for engine coolant leaks and repair as needed, then refill with coolant and recheck the system.
    radiator_cap.jpg
    Radiator Cap
  • Step 2: Inspect Heater Control Valve - The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced. After the repair has been made refill the coolant level and recheck system.
    heater_control_valve.jpg
    Heater Control Valve
  • Step 3: Check Vacuum Feed - Most heater systems are operated by engine vacuum. This vacuum is used to actuate servos to move the temperature adjustment doors inside the heater plenum. If engine vacuum is not present the heater will not operate properly. To test for this condition remove the vacuum feed line from one of the vacuum servos. With the vacuum feed line removed insert a vacuum test gauge. If no vacuum is present, open the hood and inspect all small vacuum lines from the engine to the firewall and repair as needed. If a hissing noise is present under the dash when the engine is running a vacuum leak exists and must be repaired to restore heater function.
  • Trouble Shoot Heater/Air Conditioner Blower Motor. An electrical motor is used to push air through the heater and air conditioner system. If this electric motor fails it will not force air through the system. Ground a test light lead to a good ground source, like a metal brace under the dash, seat mount bolt or under hood brace. Turn the key to the on position; check the fuse in the heater or blower motor fuse panel with a test light. Then lightly touch the service port at the top of the fuse on both sides. If the test light illuminates on both sides of the fuse, the fuse is ok and working properly. If the fuse lights the test light on one side it is blown and needs to be replaced. fuse_panel.jpg
    Power Distribution Center
    If you are unsure of the location of the heater fuse consult a repair manual. If the fuse condition is ok, position the blower speed to the highest setting. Connect the ground end of the test light to a known ground source. Then probe both ground and power feed wires of the fan motor. The test light should illuminate on only one of the wires (fan motor failed). If the test light illuminates on both wires the ground source has shorted. If neither of the wires illuminate the power source is shorted. To trouble shoot this style of problem a wiring schematic is needed.

Jan 12, 2011 | 2001 Chevrolet S-10

1 Answer

2001 ford escort zx2 has no heat. Blower OK, AC fine. I did notice the temp guage fluctuates quite a bit. When I select full hot, will get warm (NOT hot) air for about 30 sec. then it blows cold. Could...


It is much more likely you are low on coolant or you have an air bubble trapped in the cooling system. You should bleed the cooling system to get any trapped air out and make sure it is full of coolant.

Dec 14, 2010 | 2001 Ford Escort ZX2

1 Answer

Heating system not working blowing cold air


First check to make sure the coolant level is full
When driving does your temp guage show the care heating up to operating temp? If not then you probably have a thermostat that is stuck open which makes it very hard for the engine to get warm.
A possible technique to fix on a temp basis is to fasten a piece of carboard accross the lower 1/3 of the front of the radiator. This will block some of the air passing thru and help raise the engine temp. You vcan increase or decrease the amount of blockage as needed. If the engine is heatingup properly but you are not getting heat from the vents then you are not getting the heated coolant into the heatewr core. The heater core may be blocked or the controls that let the coolant circulate into the heater core are not working. Hope this helps, .

Feb 20, 2010 | Ford Focus Cars & Trucks

3 Answers

My heater just stopped working on my 94 chevy truck. what should i be looking for


the hot water line from the engine goes through a valve that is controled by the temp control on your dash,older ones were cable control, the newer ones are usually vacuum controled,look for a vacuum leak at valve or dash control

Jan 31, 2010 | 1994 Chevrolet C1500

1 Answer

Problem with the heating in Daewoo Lanos


A couple of things..First, if you are having to top off coolant levels "every so often", this indicates that you are loosing coolant. That in itself could be a seperate issue, not necessarily related to your heat, so keep an eye on that, it should be addressed. Secondly, it sounds like either the coolant being circulated in your heater core is not reaching the proper temperature, or there is a blend door that is not properly functioning, allowing cooler air to be blended with your heated air before coming out of the vent. If its the heated coolant causing the problem, there are 2 things to check. #1 make sure the car is reaching the proper operating temperature. You can check your guage, or have a mechanic check the temp. If it is not reaching the correct operating temperature, you will likely have to change your thermostat to correct. #2 you have a valve that allows the coolant to circulate thru the heater core, if it is not opening all the way, this could be the source of the problem. This valve is either in the engine compartment on the inlet hose to your heater core, (near the firewall), or on the inside of the fire wall...may have to stand on your head under the dash. This valve is typically operated by a cable that attaches to the valve and the other end goes to your temperature control lever. Good Luck, hope this is helpful.

Nov 09, 2009 | 1999 Daewoo Lanos

1 Answer

Radiator cooling fan not turning on


I would follow the wiring from the fan to the engine. There should be a temperature switch that controls an electrical circuit based on engine metal and coolant temperature. It controls the cooling fan, temp light or guage, fuel mixture, emission controls, and ECU functions. It is usually brass or stainless steel and is threaded to go into the engine block.

Jul 09, 2009 | 1992 Acura Integra Hatchback

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