Running hot

[David Vanden]

There seem to be varying opinions on whether that fuel pump is acceptable
or not.  I have got it idling at about 900 so it seems to be working.  I
replaced the radiator fan sending unit just recently so that is not the
problem.

I am replacing the coolant temperature sensor.  It rests on the side of the
engine right at/before the coolant hose inlet on the bottom side.  It is
directly above the location of the thermostat.

I am wondering if the fan is indeed  only functioning in high speed because
it is so loud and obnoxious.  But since the radiator  fan sender is less
than a year old and the fan did that since I put it in as did the old one,
I don't think that is the culprit.

It does seem like the fan comes on too often.  I am hoping that getting the
radiator cleaned will help.

On Mon, Jun 1, 2015 at 8:41 PM, Huw Powell <audi at humanspeakers.com> wrote:

> You might want to test your radiator fan sender doohickey (if that's what
> you mean by "new temperature sensor then you're all set).
>
> It's a two-speed fan, and "high" is pretty loud.  "Low" is not so bad, but
> if the sender is partly bad you might have high only.  That makes it
> louder, and also a bit hotter before it comes on.
>
> The fan should almost never come on while you are moving, but idling on an
> 80F+ day it will cycle on and off every couple of minutes.
>
> I'm wary of your concept of "superior", since you already put the wrong
> fuel pump in your car...
>
> On 6/1/2015 8:23 PM, David Vanden wrote:
>
>> It hasn't overheated.  I refuse to drive it until I at least get the
>> radiator cleaned and install the new temperature sensor.  I removed the
>> radiator from the car.  It seems to have a lot of gook inside.
>>
>> I just liked the idea of a superior radiator because I get annoyed with
>> it not running cooler and with the cooling fan coming on so frequently.
>> I figured if there was a way to quiet the cooling fan and not be so
>> reliant on it it would be cool
>>
>> On Mon, Jun 1, 2015 at 8:01 PM, Huw Powell <audi at humanspeakers.com
>> <mailto:audi at humanspeakers.com>> wrote:
>>
>>     This Nissen's:
>>
>>
>> http://www.partsgeek.com/catalog/1987/audi/4000_quattro/cooling_system/radiator.html
>>
>>     is what people have been using "forever".  Direct fit, but does
>>     require a "universal" corrugated top hose since for some reason the
>>     hose nipple is a couple of inches further from the engine.
>>
>>     I cut two original hoses and joined them with a stainless steel
>>     barbed fitting, but that's not necessary, it was just fun to do.
>>     And cheaper.
>>
>>     I don't know if people have used the other radiator shown there.
>>
>>     Has your car overheated yet?
>>
>>     - Huw
>>
>>
>>     On 6/1/2015 6:26 PM, David Vanden wrote:
>>
>>         This question may be perhaps rhetorical but did anyone install a
>>         Flex A
>>         Lite universal fit radiator, see significant improvement, and do
>>         so without
>>         spending a lot of money on mounting hardware?
>>
>>         On Sun, May 31, 2015 at 11:57 PM, Andrew Buc <abuc at andrewbuc.com
>>         <mailto:abuc at andrewbuc.com>> wrote:
>>
>>             Your 4kq is old enough that the odds are pretty good it
>>             needs a new
>>             radiator. I had the radiator on my ’87 4kq replaced 2 or 3
>>             years ago. In my
>>             case, the issue was coolant loss, not overheating (I started
>>             carrying jugs
>>             of coolant in the trunk and topping up as needed), but still.
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