Question about 1996 Ford Explorer

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The engine overheats and shows hot but when the heater is on full blast the temperature corrects.What can it be and what is the fix? maddock@hotmail.com

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By turning on the heater the blower motor is actually helping cool circulating coolant which returns to radiator. your problem is , low coolant, radiator cooling fans not working, bad waterpump, or thermostat. make sure the radiator and reservoir tanks are full.

Posted on Apr 04, 2011

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Why does my 2003 Silverado HD engine get hot when i'm backing up,even a small load on my trailer


Let me ask a question just so I that I make sure I understand.. The engine gets hot when you are backing up and only when you have a trailer hooked up .. Am I understanding this correctly? If it only does that when you have a trailer hooked up, then my suspicion is that it has something to do with how your truck is wired for a trailer and I would have someone check it out. Now if it overheats in reverse anytime you drive it .. Has your coolant levels been low anytime recently? When it starts to get hot try running your heater at full blast to see if it starts to bring the temperature back down. If it does then it is not going to be anything with the wiring. Have you noticed any moisture at all on the passenger side floorboard in the cab of the truck? Has your temperature needle actually hit the red area on the gauge at all that you can think since the last time your truck was serviced? If it has you probably need a new thermostat because once it has overheated the thermostat often no longer opens and closes properly and at the times that it needs to and sometimes they eventually get suck and many times running the heater at full blast will get it unstuck but either way running the heater full blast helps to draw the heat away from the engine helping to cool it down

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Have a 92 Nissan sentra and the heater only blows cold air


let the engine warm up to operating temperature. turn on the heat full blast. feel the two hoses going to the firewall to the heater core; if they are both hot, then your problem is in the heater box or heater controls. if one hose is significantly cooler than the other, then you have a clogged heater core and you can replace it or try and backflush it.

Mar 06, 2013 | Nissan Cars & Trucks

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1997 lexus es 300 over heats, i turn the heater on full blast and temp. goes down


Check the basics first start with water and oil levels make sure they are where they need to be. If that doesn't work try replacing the thermostat

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I have a 1999 sierra 1500 4 w drive truck and my heat core blows only gold air. can anybody tell me what is the problem?


Before assuming the heater core is blown check the following.

1. Check coolant level while engine is cold.
2. Leave the radiator cap off and let the engine run. See if you can see the coolant circulate
when the engine is brought up to temperature.
3. Check the temperature gauge inside and note if the engine temp is correct.
4 Does the engine overheat?
5. Feel the heater hoses and check if they get hot.
6. Can you smell antifreeze inside the cab?

Start here and let me know.

Oct 31, 2011 | 1999 GMC Sierra

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ENGINE OVERHEATS REPLACED THERMISTAT AND TEMP. SWITCH. CHECKED FANS AND WORKING PROPERLY AND BLED COOLANT SYSTEM WITH BLEEDER SCREW. WHEN HEATER IS TURNED ON FULL BLAST TEMP. WILL RETURN TO NORMAL BUT TEMP...


sounds like a head gasket replacement is needed here . the 2.7 is notorious for head gasket problems around the 125,000 mile mark if regular servicing has been neglected. ..good luck..if you have the bigger engine after correcting this issue regular service will give longer durability

Sep 24, 2011 | 2000 Chrysler Concorde

1 Answer

I have a 2000 Mercury Cougar and the gauge inside tells me that the engine is over heating, no heat is coming from the heater when I turn it on, the fan for the engine is running at full blast, the engine...


Hi,

The overheating and lack of cabin heat both point to a failed engine thermostat which would be stuck closed. At the warm up stage, the coolant stays in the engine block to bring the engine to efficient operating temperature, then it opens and circulates the coolant through the radiator and heat core. If the thermostat is stuck closed, the engine will overheat, and coolant will never reach the heater core, and you will not get cabin heat.

Blinking oil light at idle which goes away during driving could be a low oil level, but may also be a drop in oil pressue. You could have a clogged oil fliter (at best) pickup tube, or a failing oil pump.

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2 Answers

Heater temperature does not stay hot


1st thing to check is the coolant level. I've seen cars w/ no heat, or very little quite a few times caused by low level in cooling system--not low enough to overheat the engine, but enough that circulation of coolant to heater core is affected (no or little hot coolant circulation to heater core=no or little heat),
Is the engine temp gauge in the normal range? If it's in the low range, engine not reaching operating temp. it could be caused by a thermostat stuck in the open position (or no thermostat, sometimes people remove them when their car overheats, and this should not be done).
Here's how the system works: the heater 'box' contains a heater core (a mini radiator) w/ a fan and hoses connecting the heater core to the engine cooling system. Hot engine coolant is circulated thru the heater core. When u activate the heat switch on the dash, a flap door opens to expose the heater box to the passenger compartment. The fan switch on the dash activates the fan, which blows air thru the core, which heats the air.
So, if it's not the coolant level at the radiator, the fan is obviously working, the engine is reaching operating temperature, I would say it must be the flap door that opens, isn't opening fully, or isn't staying open. It could be the dash switch is defective (not supplying current to open flap door) or less likely the flap door is binding somehow. Hope it's as simple as correcting coolant level, if not, the dash switch control should be checked

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2001 Kia Optima over heating


I figured this out and fixed it on my 2001 Optima. Mine was an electrical problem, not an overheating problem. The problem shows up when there is a heavier than normal load on the electrical system. For most of us, this is when the air conditioner is running full-blast on a hot summer day. However, it was also occuring when I ran the heater full blast. The heater running full-blast should have lowered the temperature, not raise it. So I tested the coolant temp while the gauge was showing it overheating. The coolant temp was not increasing, but the gauge showed that it was. It is caused by a bad ground connection. Another test you can do to see if your problem is the same as mine is this. As soon as the engine is showing overheating, pull over, park the car and turn off the engine. Immediately start the engine again and see what the temp gauge shows. If it still shows hot, you'll know you've really got overheating coolant. If it goes back to normal range, you'll know it's just a bad ground connection. Turning off the engine eliminates the resistance in the electrical system that has beeen building up and causing an erroneous high temp reading.

To fix: Either find and clean ground connections throughout the vehicle until it fixes it, or do what I did. A mechanic at the Kia dealer showed me this. I ran a new wire from an empty bolt-hole on the top of the engine to a bolt into the frame behind the engine. I only added a 6 inch wire and a new bolt into the top of the engine. The bolt into the frame was already there, so I just removed it, put the wire under it, and replaced the bolt. It created a redundant ground that prevented the build-up of resistance that caused the erroneous temp reading. It was a 5 minute fix and it has never done it again. Kia knows about this problem and they put out a post to their shops on how to fix it.

Jul 18, 2008 | 2001 Kia Optima

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