Question about 1995 Toyota MR2

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The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Posted on Jan 13, 2009


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Dan how do I bleed 2004 Kia coolant car temp is good but sometime at idle heater starts to blow cool hit throttle gets great heat

I agree with your logic. Attached vid addresses bleeding. Sounds like at low rpms, not enough flow to transfer the heat. So bubble or maybe a partially obstructed core. There are a couple of vids on clearing a core... GOod luck, let us know if you figure it out.

Jan 11, 2015 | 2004 Kia Sorento

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How does the heater hoses connect to the engine

The Heater core is located behind the glove box inside the cab on the 1989 F150 and most years. Simply pull down the glove box and force the plastic wall on right side in a little to drop it all down and expose the back of the firewall. There the heater sits to be undone by pulling it out after unhooking the clips of the heater hoses on the other side, in the engine compartment.
You can use these clips again perhaps but many people prefer the screwdown band clamps. Heater cores are about $65. this year of 2015. They do go out generally when the truck is over 130K miles. You will notice the smell and leak of radiator coolant inside the cab floor when they go bad. A person could bypass the two hoses inside the engine compartment firewall in front of the globe box area, with another tube pipe to clamp together and continue the flow of radiator water while have no heat or connection. However, the job is easy enough to complete in an hour or so.
As far as how the heater hoses connect to the engine, you will find them going to the front side of the engine block on both sides.
They do not necessarily need to be exchanged out when replacing the heater core for getting warmth back into the interior of the cab.
...Have fun, Stay warm!

"A man who cuts his own firewood gets warmed twice." CA

Jul 27, 2014 | 1991 Ford F150

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My 1998 pontiac firebird service engine light came on and my OBD11 scanner produced 2 trouble codes PO125 ( insufficient coolant temperature for closed loop fuel control.the 3800V6 engine over heating and...

service the engine.. change oil ,filter plugs etc

did you clear the faults before each read
Diagnose Buick 3800 Engine
unusual code that

P0125 is the OBD-II generic code for the engine computer, or Engine Control Module (ECM), not detecting enough heat in the cooling system before the fuel management system can take control. The ECM has a predetermined value after you start your vehicle to expect a certain coolant temperature

P0125 OBD II Trouble Code Insufficient Coolant Temperature for Closed Loop...

ecm runs the engine cooling fans

3800V6 engine over heating and heater produces cold air
try these

EGR vale not working
inlet manifold gasket leaking
water pump fins corroded
soft radiator hoses
try a new radiator cap

internal heating
heater control tap stuck
directional actuator flaps stuck

Apr 16, 2017 | Cars & Trucks

1 Answer

Chevy s-10 2003 overheating and no heat in the cab

indicates no0t enough coolant in the system probably from an air lock that has not been bled out properly
overheating can be from head gaskets /cracked head or problem viscous fan hub

Jul 20, 2017 | Cars & Trucks

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The heater does not blow hot air, Is there a simple fix for this problem? The heater worked fine last season. This year all I get is warm air.

There are several potential issues to consider. First, check your antifreeze level--making sure you don't open the radiator cap when hot, of course. Your cab heater uses engine antifreeze for a heat source, and when the level is low, there may not be enough fluid to reach the heater core. This is the most common reason for poor heat output in the cab.

If that checks out, it is also possible that you have clogged or collapsed hoses leading to the heater core, or that the heater core (located in the cab) is clogged. This can occur when antifreeze has not been changed often enough, when internal engine rust had built up, or especially when a "radiator seal" product has been added to the antifreeze.

It is also possible that nothing is wrong with the heater core but that the various controls, ductwork, or dampers for your truck have become jammed or broken and that the system is allowing a mix of cold air with the hot air--in spite of your setting asking for all hot air. Since many modern cars now have electronic controls for the heat, this can be difficult to judge without disassembly.

Nov 25, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Have replaced radiator. Have bled cooling system.

blend doors recalibrate,the stop point connected to the actuator breaks.

Nov 29, 2009 | 2001 Jeep Grand Cherokee

1 Answer

My 1986 toyota mr2 keeps heating up past 210. i put a new thermastat in and nothing.

Be sure that the fan is moving enough air across the radiator and be sure the radiator is clear of any debris. If it is and you're sure the system is full of coolant, have the radiator rodded out or replaced. This is most likely the issue. Hope this helps, good luck!

Sep 02, 2009 | 1986 Toyota MR2

2 Answers

1994 Honda Civic LX\overheating within 2 mile drive

Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

Aug 23, 2009 | 1998 Honda Civic

1 Answer

I get all cold air / no heat when using defrost and all heaters

It is possible that you may have an air lock in the system. You need to drain the rad again and remove the upper most heater hose from the heater core and raise the hose up high . Fill the rad until coolant comes out of the heater core pipe. Carefully reattach the heater hose. Fill the rad slowly allowing trapped air to escape.This may take a while. Once the rad is full put a catch basin on the floor under the rad filler neck.Start the car and let it run to operating temperature.Allow the expanding coolant fall into the basin.Once you see circulation in the rad you can slowly top the rad off.once you do this replace the rad cap and fill the reservoir bottle 3/4 ways to the top. Shut the car off and let it cool off filling the bottle as necessary.Hopefully this will cure your problem. Good luck :-)

Dec 13, 2008 | 1994 GMC Sierra

2 Answers

Over heating

Overheating on the SW20 (Mr2) is usually down to one of the following:

Air lock:From a badly bled coolant system (Easy fix)
Thrmostat failure:Preventing the coolant getting to the front radiator(Easy fix)
Water pump failure:(Water pump can be fubar(Not so easy a fix but not too expensive for the mechanically minded)
Head gasget:It can go,when it does it blows all the coolant out of the radiator(Expensive to fix and not easy at all)
Radiator filler cap:Common fault on older cars but less than 10 bucks to fix(Not even a problem)
Heater pipe leak:They don't call them the pipes from hell without good reason.(Pain in the neck if they go,not expensive to repair but takes ages)

Hope that clears it up a bit :)

Jul 23, 2008 | 1992 Toyota MR2

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