Question about 1990 Toyota Corolla

1 Answer

1990 Corolla Cooling system problems

Hello..... Im having several problems with the cooling system in my corolla. First, It always runs cold when I am on the freeway, but in the city it stays in the normal temp range.  Also, I had the radiator replaced recently, what is the sensor that mounts to the bottom of the radiator do, and is it critical? My guess is to the fan (which never worked anyway)

Posted by on

  • Adrian Walker Dec 11, 2008

    What about the wire/sensor on the bottom of the radiator?



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Toyota Master
  • 1,861 Answers

Your temp gauge reads low on the highway, and one-half in the city?
You need to replace the thermostat. It is sticking open.
Driving at highway speeds, the blast of air that the car is cutting through enters the radiator, thusly cooling it, and the coolant inside the radiator... In town, with the lesser amount of air being forced into the radiator, (slower speeds), the coolant temperature rises. Replace the thermostat, and you will be OK.

Posted on Dec 11, 2008

  • Toyota Ed Dec 11, 2008

    That is a coolant temperature sensor. Turns the fans on when it hits a specific temperature. The fans rarely run when it is real cold, or if your thermostat is stuck open.

    Thanks for the FixYa, Much Appreciated.



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

A 6ya expert can help you resolve that 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.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Cooling fans always on with cold engine

like all cars with elect fans.
1: stuck relay
2: stuck signal controlling said relay

on older cars the controlling factor is the fan over temp switches
on newer cars the PCM controls all that.
the best way to fix cars is to get the book.
the book is called FSM. factory service manual.

or at toyotanation, dot com.
prizm = corolla.

Aug 28, 2014 | 1990 Geo Prizm

1 Answer

I need a. conditioner wiring diagram for 1990 corolla

I am sorry but we have no wiring diagrams here at fixya due to copyrighted material.

Sep 04, 2012 | 1990 Toyota Corolla

1 Answer

Toyota corolla 2003 air conditioning green light blinking and cold air not blowing

You've figured out by now the blinking light means the system has a problem. You'll need to find out if the system is low on freon or if a relay or electrical part is failing. The cooling fan could also be failing to come on, which would make the high side pressure exceed the limit and shut down the system.

Jun 24, 2012 | 2003 Toyota Corolla

1 Answer

Toyota corolla GLS 16 valve 1990 overheating

its 22 yrs old so without a look under the bonnet i couldnt say but i would suspect a head gasket or the water ports in the corroded away even more so if no antifreeze in the system .but it could be a blocked rad or a cooling fan not working a thermostat jammed in fact anything so ask the opinion of a local mechanic first before listerning to any old tom **** or harry who after one beer know a bit and after three beers know everything their is to know about motor vehicle technology

Feb 29, 2012 | 1990 Toyota Corolla

1 Answer

1990 toyota corolla wagon 1.6 liter 5 spd. overheating

you've got a possible blockage in the head or block.

Oct 03, 2009 | 1990 Toyota Corolla

2 Answers

Find and replace thermostat 2003 corolla--thank you !

Follow the lower radiator hose to the engine. Most Toyota's along this year model have the thermostat located in the engine, where the lower radiator hose connects to the engine. Changing the thermostat is pretty straight forward. Refilling is a little trickier. Search the top of the engine and find the bleeder screw for the cooling system. Open this bleeder screw, usually a 10mm, or 12mm socket will fit, and fill the cooling system with the recommended coolant. Pay attention to your mixing ratio as well.

Nov 10, 2008 | 2003 Toyota Corolla

1 Answer

91 corolla air conditioner

Are U sore, that U must use freon in your cooling system?
I think the system use R 134 gas for cooling, with a special climate compressor oil.

Jul 26, 2008 | 1991 Toyota Corolla

1 Answer

Cooling fan corolla 98

The corolla fans are pretty standard over this period. Verify that the electrical connector is identical and you should be good to go.

Jun 28, 2008 | 1998 Toyota Corolla

Not finding what you are looking for?
1990 Toyota Corolla Logo

420 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

77939 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8832 Answers

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

Answer questions

Manuals & User Guides