Question about 1994 Toyota Tercel

1 Answer

No heat, temp gauge low, need ideas...

Hi all, I am writing this for a friend to see if I can get any ideas for her.

She has a 94 Tercel, and has been complaining that there is no heat output. If the car is allowed to sit at idle for a while, some heat will be produced. This is where it gets the car is driven, the temp gauge will drop and the heat is gone.

I have not seen this before, myself I have had cars where the heat was low, but the engine was hot, temp gauge ok, etc etc.

I have not personally checked the fluid levels, but she says it is ok and has been driving around like this for a few years. If the fluid level was low, that engine would have been dead/fried long ago.

She replaced the thermostat recently, didn't help.

Any ideas?????


Posted by on

  • Michael Brigham Nov 26, 2008

    Hi Bill, thanks for the reply....

    I had thought of that, but the water temp gauge dropping to cold threw me off....I am not familar with Toyota's either.

    Would a blocked core affect the temp sensor? Have you heard of this happening before? I am at a complete loss....not that I have a lot of experience either....

    Thanks again.....




1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 193 Answers

Sounds like a chronic case of plugged heater core. Water can flow through the tubes as long as the flow is slow. When the engine speed is raised, the flow decreases.
If you would like to contact me again about this or other problems, feel free to do so.
ASE Master Technician

Posted on Nov 26, 2008

  • mike dirt Nov 26, 2008

    Hi Michael. Thanks for writing back. No, the temperature-sending unit would not have anything to do with the problem. The problem here lies entirely with the heater core, which is just a miniature radiator, even works the same.

    What happens with cars that have age is that the tubes that are present in the heater core, can plug up over time, and cause a restriction in the flow of water. The water that flows into the heater core releases the heat that it carries. If the rpm's of the engine are low, the water flow is slow and a partially plugged heater core can handle that. As you bring up the rpm's, the flow of water is increased, and the plugged heater core can not allow the flow of water, consequently causing a stoppage of water flow through the heater core.

    Remedy; have a new heater core installed.

    Hope this helps.

    If you would like to correspond further with me on this or any other issue, please feel free to do so.


    ASE Master Technician



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

94 acura legend temp gauge goes up when cold after sitting overnite

I would check the system for leaks and low coolant and then if nothing is found replace the thermostat.

Aug 21, 2012 | Cars & Trucks

1 Answer

I have a 1997 jeep grand cherokee laredo 6 cyl. i was driving and noticed the battery gauge said the battery was dead and then i noticed the check gauges light went on. i pulled over and saw my temp gauge...

well check the coolant level. it sounds like you had a vapor lock and that would cause steam to escape and cause connections to get wet. this may have cause your battery to read dead. if you aren't low on coolant then i would start with the thermostat. that is easy to change and cheap. if you have low coolant then you may have vapor lock. to fix that you need to let the engine cool down and if you have a radiator cap remove it. look inside you should see coolant. if you don't fill up the radiator with coolant. with the cap off start the jeep and turn the heater on. let the engine warm up. watch the temp gauge and keep looking in the radiator. if you don't see coolant keep add it. at times it will bubble and burp this is normal. keep checking the temp gauge. now see if you feel heat coming out of the heater. if your feeling good heat then the system is circulating. (this mean your not in vapor lock anymore) let it keep running and keep adding coolant till it is full in the radiator. once full put the cap back on and fill the coolant tank to the full point. keep running it but keep checking the temp to be on the safe side. if the temp stay steady you should be good. hope this helps. please rate.

Jan 08, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Fans dont work and overheats 94 toyota tercel

Most systems work pretty much the same. First check the fans themselves by hot wiring them to the battery. If they work, you need to check the engine temp sensor (some vehicles use one for gauge and fans, others use a separate one for fans) relay, and of course any fuses.
You will help yourself a lot by getting either a chilton or haynes manual to show you how to do testing.

Jun 20, 2010 | 1994 Toyota Tercel

2 Answers

Heater problem

Ok, some clues, good. When the jeep has been driven for 10minutes, it should be at operating temperature. What does the temp. gauge indicate at that time? Is it on the low (cold) side, in the middle (normal) or near the hot end of the temp. gauge? Let me know the answer to the above, also check to coolant level and let me know what you find. If the coolant level is low, it can result in the engine running hot, and result in no heat. When the level is low, it won't circulate coolant through the heater core, which means you won't have heat. So let me know about the engine temp, and the coolant level, this is the easiest and simplest possibility of why you don't have heat. If this isn't the problem, do not rate my answer until I can help further after I get the above info from you.

Nov 23, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Hi I have 2001 Hyundai Santa Fe, 2.4L FWD.

dear friend-as i can gather your problem lies with the temp sendor unit.replace that and your problem should be solved.

Jul 06, 2009 | 2001 Hyundai Santa Fe

1 Answer

Not much heat from 94 ply. gr. caravan when below 15-20 degrees

probably you have low coalant add some more or there some leak in heater core in the back or front

Apr 03, 2009 | 1996 Dodge Caravan

1 Answer

The heater is not heating the car when on hot

1st check the coolant level. Low level will cause a no heat situation as you describe. What does the engine temp. gauge indicate? Is it indicating on the low side of normal, or is it in the normal range? If it indicates a low operating temp. after car warm up, the thermostat may be stuck open, which would not allow the car to fully warm up, and again, result in the no heat condition. Let me know about checking the coolant level, and temp gauge info. Curt

Apr 01, 2009 | 2002 Subaru Forester

1 Answer

Coolant temp stays low

I believe when they replaced head gasket they installed too cool of a thermostat in it. need to replace thermostat with proper one should probably have a 195 degree one in it

Nov 06, 2008 | 1998 Dodge Stratus

Not finding what you are looking for?
1994 Toyota Tercel Logo

316 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

79865 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides