slightly running hot - intermittent
03-29-2007, 11:54 AM
#1
AudiWorld Super User
Thread Starter
slightly running hot - intermittent
I changed the TB/water pump/thermo on my car around xmas time. Since then, I've driven about 3,000 miles and the temp gauge will randomly go up to 1:00 position and then slowly come back down.
It never goes past that point and I can't find a real pattern. It's done it at anywhere between 20 degrees and 65 degrees (outside temp).
Admittedly, I haven't done any troubleshooting but should probably get this sorted out before summer is here and I'm in traffic with the A/C running. I immediately replaced the fan clutch when this first happened because it didn't have any resistance, but that didn't make a difference.
I can't believe that I have an airlock with all the miles I've driven but maybe I should re-bleed the system? I also doubt that the thermostat would randomly act "defective" but I'm open for suggestions.
I have verified that the electric fan is coming on and I'm sure that is what causes the temp to rapidly come back down when it hits the high point. I can watch the needle go from 1:00 to 11:00 in about 30 seconds.
A guy on the A4 forum changed his TB and has had the exact same problem but hasn't figured it out yet. I verfied that we have different thermostats.
Any ideas?
Bob
It never goes past that point and I can't find a real pattern. It's done it at anywhere between 20 degrees and 65 degrees (outside temp).
Admittedly, I haven't done any troubleshooting but should probably get this sorted out before summer is here and I'm in traffic with the A/C running. I immediately replaced the fan clutch when this first happened because it didn't have any resistance, but that didn't make a difference.
I can't believe that I have an airlock with all the miles I've driven but maybe I should re-bleed the system? I also doubt that the thermostat would randomly act "defective" but I'm open for suggestions.
I have verified that the electric fan is coming on and I'm sure that is what causes the temp to rapidly come back down when it hits the high point. I can watch the needle go from 1:00 to 11:00 in about 30 seconds.
A guy on the A4 forum changed his TB and has had the exact same problem but hasn't figured it out yet. I verfied that we have different thermostats.
Any ideas?
Bob
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03-30-2007, 05:31 AM
#10
AudiWorld Super User
Thread Starter
you know, that's the first thing I would have replaced if I hadn't just done the TB job
seems odd that this started just after I had my hands on it. Never touched the temp sensor though but maybe it's a weird cooincidence.