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TEREX 860 temperature gauge not working engine warm gauge in cool area. Cab heater warm not very hot what is the proplem

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If the engine is not reaching operating temp, then the heater is never going to blow warm air. I would start with checking temp of engine, if its not warm enough (180f) I would replace the thermostat

Posted on Nov 10, 2010

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Dose not blow hot air


Start with the coolant level in the radiator.
Although the car may not ever run hot, the heater is higher than the water pump, and any air caught in the cooling system can cause the heater to stop working.
Your cooling system should be full of coolant.
Next, the thermostat of the engine could be stuck in the open position, which will not allow the heater to put out warm air.
If you car has a dash gauge that reads the engine temperature (I do not think it does), you can tell if the thermostat is stuck open by the fact the gauge stays cold, or nearly cold, all the time.
Finally, the valve under the hood that opens or closes to allow the hot coolant to flow from the engine to the heater may not be opening and closing properly. Most of these valves are vacuum controlled from the dashboard controls.
God bless your efforts.

Oct 02, 2015 | 2002 Dodge Intrepid

1 Answer

What causes hyundai Elantra 2002 tempature gauge fluctuates between normal and hot


The thermostat "seals" the cool coolant giving up (rejecting) heat in the radiator & heater core from the hot coolant absorbing heat in the running engine "block".

When the coolant in the engine reaches a specific temperature (180 ~ 195 degrees) as determined by the value selected by manufacturer or when replaced, it opens and allows the hot coolant in the engine block to be pumped out to the radiatot & heater core for cooling and the cool coolant in the radiator / heater core is pumped into the engine block - replacing the hot coolant. The thermostat senses cool coolant in the engine block and seals shut until the temperature of the coolant in the engine block rises to 180 ~ 195 degrees again. This process continues over and over for as long as needed.

You should check to make sure that the coolant level in the reservoir / radiator is sufficient by checking when cold. Do NOT remove a radiator cap when it is hot! With the cap off, start the engine and add additional coolant as the engine warms up to normal operating temperature. If coolant levels are ok, the trouble could be related to the thermostat or possibly a faulty temperature sending switch. This means that the temperature of the coolant is fine - but the switch or sensor that converts the temperature to a voltage for the gauge on yur dashboard is the problem.

If the temperature is fluctuating up and down, you should have it fixed. Good luck!

Apr 12, 2013 | 2002 Hyundai Elantra GT

1 Answer

1993 dodge caravan heater problems


There should be a vac controlled valve on the heater hose near the firewall. If that valve fails, or something happens to the vac source, the valve will not open or close. I would check that valve and make sure it is working. Both heater hoses should be hot when the engine is warmed up.

Dec 08, 2012 | Cars & Trucks

1 Answer

Heater is not getting hot and the temperature needle isn't working


First I would have said your thermostat is stuck open. But if the engine is overheating and the gauge reads cold the cooling system is probably empty. Or there may be alot of air pockets in the cooling system instead of all liquid coolant.
If the system was full and the water pump failed the heater might not work but the gauge would read hot.

Jun 25, 2012 | 2004 Chevrolet Impala

1 Answer

My 1991 volvo740 bertone coupewater temp. gauge doesn"t move at all after the engine is warmed up. The upper hose is hot. The water in the resevoir is cool as is the bottom radiator hose. There was...


The thermostat is on top of the engine, just aft of the upper radiator hose. The temperature sensor (first one, closest to the front of the engine) is the one responsible for the coolant temperature gauge. It's an NTC with two resistors in it - one for the sensor gauge, one for the ignition computer. There is a second one for the Luftmassenmesser Hidtstraht system, bottom right side under the intake manifold.

If you have a drop of anti-boil on the water pump - it is coming from the weep hole and this is indicative of failure of the internal seals on the pump and it must be replaced.

There is a possibility that the thermostat is stuck closed, which can be easily verified in cool weather by cool air coming out of the vents at normal operating temperature. Check the heater core hoses - one should be warm.

Be careful when working on the cooling system - it can scald when hot! Always work on it with the engine cool to the touch and never put cold anti boil in a hot engine.

Checking the temp sensor is easy - remove the connector and place a 68 ohm resistor across both terminals (or one to ground if it is a single spade connector). The temp gauge should read approximately 3/4 across the scale. Don't short it to ground as this could destroy the sensitive coil inside the sensor. If no reading occurs, then the gauge or wiring is broken.

Jan 07, 2011 | 1991 Volvo 740

1 Answer

Replaced water pump now car wont get hot in cab temp gauge says norm


It is quite possible that a pocket of air is now trapped in the heater core..... not exactly sure how you would get that air out manually because I don't know how hard it would be to disconnect a heater hose...... but you could try facing up a steep hill and revving the engine a few times..... it may push some or all of the air out. A vacuum pump suction applied at the fill hole may **** it out - withe the engine running at temperature. REMEMBER: never open a cooling system while the engine is hot! If the cap has been taken off BEFORE the engine is warmed you'll be fine..... but will still have to beware of the steam.....

Oct 13, 2010 | 2006 Pontiac Grand Prix

1 Answer

The radiator fan is not coming on when warm, but I still have heat and not over-heating?


Your heater blower, inside the car works to provide heat to the interior of your car, and the air is hot, right? If the cooling fan is not coming on, depending on the outside ambient temperature, you may be using your heater coil for the heater to dispell suficient heat (inside the car), combined with a low outside temperature to keep the engine at normal operating temperature negating the need for the cooling fan. OR your coolant temperature sensor is bad, and the ECU doesn't know that the engine is hot and to turn on the fan. This sensor works by changing the voltage returned to the ECU depending on the temperature of the tip, which changes the resistance to the computers inquiry. So, the computer knows the temp of the coolant. It uses this information to adjust mixture gauge etc. Most now have 2. One for the gauge, and another for the ECU. So don't go by the gauge working. Then there is the fan motor itself. This can be tested by using a testlight on the wires when the engine temperature gauge in at 3/4 to the hot side of the gauge. The other way to test is to bring a live wire to the motor. If the motor is good, the sensor is bad, if the motor is bad, well the motors bad. I hope this helps you, write back if you need additional assistance. . Please take the time to rate our free service, and my performance. Thank you for trying FixYa.com!

Apr 13, 2010 | 1989 Oldsmobile Cutlass Ciera

1 Answer

Randomly the temp gauge will rise to the ''H'' but no lights on dash, when this happens the heat will turn cold. The gauge will stay there for approx 10 seconds. gauge comes down, the heater warms right...


Many engines are equipped with a small valve located at the high point of the coolant flow. (sometimes around the thermostat housing) If there has been any repair to the cooling system that reqires the coolant to be lowered, The air must be released by opening this valve until the coolant fills the area that the air pocket occupies. You should refer to your repair manual if you are doing the work yourself or your mechanic to prevent injury from hot coolant. At any rate if your heater is going from cold to hot you can be fairly sure you are not getting coolant flow 100% of the time.

Mar 23, 2010 | 2003 Ford F150 Regular Cab

1 Answer

My heater does not get hot. the temp. is around 200. it's just a little warm.


Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

Jan 15, 2010 | 1997 Dodge Ram 1500 Club Cab

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