Question about 1993 Toyota Corolla

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Starts to run hot but will drop temperature when heat is turned on

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It is normal for the temp to drop after the heat is turned on because the heater core acts as a second radiator. Your radiator, or thermostat may be bad if the car is over heating. The thermostat would not open, or be stuck closed, not letting in the cooler fluid to cool the engine block causing your temp to go up and eventually the car will overheat.

Posted on Jul 27, 2009

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Check your t stat

Posted on Jul 27, 2009

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What would cause my 95 suburban temperature gauge to fluctuate?


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Car hiccups and stalls


Although your temperature gauge may show that it works, some models have a second temperature sensor for the engine management system.
That second sensor provides info which sets curb idle and timing advance. The "Cold start" feature is a part of this. The hic-cup is something of a bucking symptom as the engine controls toggle between hot and cold run settings repeatedly as water temperature is not stable.
In the past, I found several 1984 engines having defective thermostats which are tied into "Step-up" solenoids for the curb idle. What happens is idle speed is suppose to drop when the engine is hot.
When someone adjusts the curb idle while the engine is on the "cold setting", the setting(rpm) will be too low once the engine has heated up and the part drops to a hot setting.
So to clearly define your problem, you have 2 stemming from the same defects. The "in motion" problem is caused by timing changes based on temperature and the "idle" problem is caused by improper adjustment of the curb idle solenoid because of unstable operating temperature.
What you want to do is change your thermostat. This will give you a stable temperature. Then let the engine heat up and you should notice a "click" and the engine should idle down. It may stall. Then turn the idle rpm up until the engine will not stall.
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Will not start when hot


What you describe is a "heat sink problem". Within 3 minutes, the faulty component has not had enough time to cross the threshold of failure. Residual heat will build after an engine is shutdown, and exceed heat limits that the fans and the water pump usually disperse.
Wiring diagrams are available at Autozone on the Web when your register your vehicle.
You can try several things working within the 1 hour time frame. Open the hood and see if the downtime is shorter. By opening the hood, you let heat escape. Test the circuits that are dead and see where the power drops off. You know the coil and module are dead, were the Power terminals supplying the relays tested during Downtime?
Now if you had not said there was a Power issue, this would sound like a "lean fuel" problem caused by a temperature sensor keeping the engine set too lean to fire.
Crazy as it may sound, Anti--theft systems kill circuits when battery voltage drops. A hot battery could react to "heat sinks" and throw off the anti-theft.
Would be interested with what you find.

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When engine get hot, engine stop, when engine temperature drop, motor start


I just fixed this problem o my car, and it costs no more than $20 to fix... replace your thermostat. What happens is that the car reaches a certain temperature and the coolant flows to keep the car cool, well if the thermostat doesn't open at that certain temperature, the car runs how and eventually turns off; causing you to wait until it cools down to be able to turn it back on. The fix took no more than 15 minutes and the car runs great now.

Feb 22, 2013 | 2000 Mazda Protege

1 Answer

Poor heat inside car. some heat when fan on low but when fanspeed is increased heat is lost.


Hello,
It sounds like you have an issue with the thermostat, or blockage in your cooling system.
Here's a few things you can do to check both.
How to test the thermostat in most vehicles;
Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the
engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater
temperature on high and turn the fan speed on high.
1. Listen very closely for a click sound from the engine, ( most thermostats make a click when
they open )
2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate.
3. Usually within a few minutes the radiator fan will kick.

If the thermostat appears to be working, do the following.
Turn the engine off. While it's still hot, carefully reach back behind the engine, at the firewall, you should see 2 hoses beside each other, ( around 1 inch in diameter ), feel both of these hoses. If they're both hot then the coolant is circulating fine, but if only one of them are hot, that means something is blocking the coolant from running through the heater core.
If you have blockage, the best thing you can do is have the cooling system flushed and refilled.

I hope this helps you.

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1 Answer

2001 town&country had replaced radiator but now fan stop working van is not over heating and heat is good hanve no other problem just fan s not working olease help me to find out waht could be problem


ANY TIME YOU CHANGE RADIATOR ONCE YOU GET THE NEW RADIATOR IN PLACE.FILL RADIATOR WITH ANTIFREEZE CRANK VECHICLE UNTIL THERMOSTAT OPEN. WHEN YOU TOUCH THE TOP RADIATOR HOSE.IF TOP HOSE HOT THERMOSTAT OPEN.CHECK RADIATOR COOLANT LEVEL IF DROPPED ANY.ADD COOLANT UNTIL LEVEL QUIT DROPPING. WHEN COOLANT LEVEL QUIT DROPPING YOUR COOLANT LEVEL IS CORRECT. NO MORE AIR IN COOLANT SYSTEM OR AROUND COOLANT TEMPERATURE SENSOR COOLANT FAN SHOULD TURN ON ONCE ENGINE GET TO CERTAIN COOLANT TEMPERATURE.SEE IF COOLANT TOO LOW NOT ENOUGH COOLANT REACH COOLANT TEMPERATURE SENSOR. SENSOR CANT TURN ON FANS IF ITS NOT IN HOT COOLANT. WHICH DECREASE ITS RESISTANCE WHICH CLOSE OR GROUND CIRCUIT CAUSING COOLING FANS TURN ON.

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3 Answers

Cannot get cooling fans to turn on for radiator???


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1 Answer

My 2002 xterra has started running hot..code po 217 came on..after gas cap was put on wrong..cleared code put gas cap on right then fine for 2 weeks..when idleing heat gauge rises high..as soon as i rev...


p0217 is coolant over temperature. the fan clutch may be slipping or the thermostat is bad. changing the thermostat would probably be the easiest and most inexpensive fix to determine the problem.

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3 Answers

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