Heater

JOHNNY DEE

MEMBER
1999 HONDA CIVIC
4 CYL
FWD
AUTOMATIC
155,000 MILES

I was driving my 99 civic lx last night. My temperature guage was in the normal range straight in the middle. Now, when I has my heater on, it blew cool air, and the temperature guage started to go to hot. Then when my heater started to get hot, the temperature guage went back to normal. What is the problem?

3 Replies

DRCRANKNWRENCH

MECHANIC
3,380 POSTS

Let me ask a few things about the car and I will try to help;

The temperature gage on the dash of the car reads hot?
When is it doing this?
Turning the heater on makes the temperature3 gage read lower?
Is your heater blowing air that is not warm enough at times?
If so, when?

I will lok for your reply and get back to you ASAP.

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Saturday, November 20th, 2010 AT 5:21 PM

JOHNNY DEE

MEMBER
2 POSTS

Sometimes when I sit idle after driving, the guage would go to hot without the heater on. Then I drove my car down the road, I had my heater on and then it blew cool air instead of hot. Then when it blew cool air, I saw the guage go to hot, then after maybe a minute or so the heat began to go from cool to warm to hot, and then I saw the guage go back to the middle normal range.

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Saturday, November 20th, 2010 AT 5:43 PM

DRCRANKNWRENCH

MECHANIC
3,380 POSTS

There are a few things that could be going wrong. I would start eliminating things that are due for service anyway and on the cheaper end of the repair scale.
Start by replacing the thermostat and flush and fill the anti-freeze using a 50/50 mixture of anti-freeze to water.

The nezt thing I would look at if that does not solve the problem would be the temperature sensor.
Depending on the motor in your car, if it is a 4 cylinder I think it will be either a D-series or B-Series, the sensor for the temperature gauge is actually the temperature of the engine oil and there is a seperate sensor for the car Computer to take readings from to make adjustments.

If you have any further issue, let me know and we will go through that nexr step.

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Saturday, November 20th, 2010 AT 6:03 PM