Temp problem...

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Mar 15, 2004 | 04:01 PM

A4FF98

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Joined: Dec 2002

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Temp problem...

Recently I have noticed that my car takes a long time to heat up. Before it warmed up relatively quickly and stayed between the C and H. But now whenever it starts to warm up, and I push the car to higher RPMs (3-5) the needle drops back down. And I would be out doing some errands for a couple hours and it would still not give a consistant reading.
If anyone knows whats up I would really appreciate the feedback.

Thanks

Mar 15, 2004 | 04:04 PM

njskier (A4i)

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Does your heat work inside the car?

If not, it's probably your thermostat.

Mar 15, 2004 | 04:04 PM

~~ModifiedA4~~

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you need a new coolant temp sensor. happened to me.

<center><img src="http://pictureposter.audiworld.com/143/bad-temp-sensor.jpg"></center><p>your gas milage will suffer.

its an easy fix, and its cheap.

(in the pic see the oil temp vs the coolant temp? my needle would bounce around as you descibed as well)

Mar 15, 2004 | 04:11 PM

~~ModifiedA4~~

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here's how you replace it....by the way...

<ul><li><a href="https://www.audiworld.com/tech/eng47.shtml">https://www.audiworld.com/tech/eng47.shtml</a</li></ul>

Mar 15, 2004 | 04:20 PM

AudiMick

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Joined: May 2002

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From: Redmond WA

The temp sensors generally work or not....

.. more likely its a thermostat.

Mar 15, 2004 | 04:25 PM

DAP@EPL

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Joined: Jun 2000

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Agreed.

My thermostat was sticking open and my car would take forever to heat up. And temperature would drop down slightly while cruising and only come back up if I drove the car hard.

I had the thermostat replaced and it has been fine since.

-Dave Pramanik

Mar 15, 2004 | 04:35 PM

~~ModifiedA4~~

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ehhh....mine bounced, literally, whenever i got on the gas.

its not digital (on or off), not at all.

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Mar 15, 2004 | 05:38 PM

DAP@EPL

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Joined: Jun 2000

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If the needle is moving erratically, I'd say temp sensor as well. However...

if the gauge is moving smoothly but just taking a long time to warm up and dropping down to the cold side on easy driving, thermostat is the more likely cuprit.

Regardless, the temp sensor is a cheap and easy to replace part so probably start with that and if it fails to solve the problem, move on to the thermostat.

-Dave Pramanik