Okay, well I've done almost everything I can think of...
I replaced the Thermostat, replaced the coolant sensor twice, and flushed the system. The car still says it's overheating. I put a Digital Termal meter in the coolant flow and it'd get up to about 235-220f degrees. When I flushed the system not all of the coolant came out, and the reservoir wasn't draining down so I shot a little air into the overflow hose on the reservoir, and that cleared it out. I pulled off the coolant bleeder hose that goes into the heating coils, and there was still some coolant in there. I put in the Prestone Superflush, and some water ran the car for 10-15minutes. The car got up to the last bar on the heat guage even though the thermal meter said it was running between 234-220f. We blew all the flush stuff out and I'm not sure what to do? When I originally checked to see if the coolant system was bleed correctly with the car warmed up the cooland was dribbling very slowly out of the bleeder hole. When I had the bleeder hole open last night it was squirting pretty good.

Could it be the water pump?
How is the fluid supposed to come out of the bleeder hose?
Does anyone have the correct part number for a (early)1999 Audi A4 1.8t coolant sensor?

What do you think it is or should I try next?

Thank You
Stas

 

I was not pleased with Audi's use of plastic for the wp impeller. Impeller warpage could reduce flow.

 

you made not mention of the fans

 

Fans run fine...

 

The Water Pump Impeller is the original.

 

If the water pump is original, I assume you haven't done the timing belt yet? If it's any consolation, you really should do the timing belt on that car NOW. So while you're taking everything apart, check the radiator for stoppage (you'll have it out of the car), and replace the water pump.

 

Probably got a bad rad or the waterpump is a goner. The rad on our 00 30v was leaking and causing the car the run 10 degrees hotter at 52k. So , they can go early. I don't think the components in the Audi cooling systems are very robust. At 60k, I basically rebuilt everything involved with it, hoses, rad, w-pump, sensors.

 

I have about 5k miles before I need to do the second timing belt, but I was hoping to get rid of the pile of junk before that came.

The car is at 113k miles right now... I just want to get it so I can make it to the toyota dealership and get a Tacoma...

What temp should my 1.8t A4 run at?

 

if you're looking at the temp in vag.com, it should be 90C with a little room for fluctuation.

 

Well I went to the dealer and picked up a water pump... He gave me a great little hint to makeing sure it was the water pump...

Take off the thermostat housing, put your finger in there and press on the fan blades while turning the pulley for the water pump. If you can hold the blades still with your fingers then your WP is eff'd

I HAD NO IDEA WHAT I WAS GETTING MYSELF INTO...
113k on the car and I replaced the old timing belt at 83k I guess it's time to put on another Timing belt...

All of this stuff just to sell the car as soon as I'm done with it!
ARG!