Hi All
Sorry for the long winded explanation.
Need some help diagnosing a temperature problem on my 2007 audi a3 tdi 170 (BMN eng code).
The issue started when sitting stationary in traffic the temp gauge started to drop down approx 75-80 deg but would increase back to normal 90 deg and then drop again when stationary.
I have changed the following items thermostat and two coolant temp sensors G83 and G62 (one on the thermostat housing and one below the tandem pump). All parts from audi dealer.
I let the car run up tp temp (90 deg) and bled it.
I now have the following issues:
1) Bottom hose cold even with car idling for 3 hrs and a 20 min drive even after many attemps of bleeding. The car does not over heat (eng temp 90 deg and oil temp 82 deg steady).
2) With the heating on high temp and medium fan both engine temp and oil temp start to drop gradually and so does the hot air from heater. With heating off both eng temp (90 deg) and oil temp (80 deg) rise and stay steady but bottom hose still cold even after many attempts of bleeding. The car was running for 2 hours.
I have tested both new and old thermostats in a pan and both open at approx 86 deg.
I have run the car for 2 hours without the thermostat and all is fine with temperatures engine at 90 deg and oil at 80 deg steady even with the heater on but have no heat from heater.
I have run the car for 3 hours with fuse 8 out and thermostat back in and can get the thermostat to open only when oil temp gets to 87 deg even though engine temp shows steady 90 deg. The engine temp did not go over 90 deg and did not overheat.
Looks like i only get heat with thermostat in place but have fluctuating eng and oil temp and closed thermostat.
I seem to have the only car not to overheat............
Am i missing something
Sorry for the long winded explanation.
Need some help diagnosing a temperature problem on my 2007 audi a3 tdi 170 (BMN eng code).
The issue started when sitting stationary in traffic the temp gauge started to drop down approx 75-80 deg but would increase back to normal 90 deg and then drop again when stationary.
I have changed the following items thermostat and two coolant temp sensors G83 and G62 (one on the thermostat housing and one below the tandem pump). All parts from audi dealer.
I let the car run up tp temp (90 deg) and bled it.
I now have the following issues:
1) Bottom hose cold even with car idling for 3 hrs and a 20 min drive even after many attemps of bleeding. The car does not over heat (eng temp 90 deg and oil temp 82 deg steady).
2) With the heating on high temp and medium fan both engine temp and oil temp start to drop gradually and so does the hot air from heater. With heating off both eng temp (90 deg) and oil temp (80 deg) rise and stay steady but bottom hose still cold even after many attempts of bleeding. The car was running for 2 hours.
I have tested both new and old thermostats in a pan and both open at approx 86 deg.
I have run the car for 2 hours without the thermostat and all is fine with temperatures engine at 90 deg and oil at 80 deg steady even with the heater on but have no heat from heater.
I have run the car for 3 hours with fuse 8 out and thermostat back in and can get the thermostat to open only when oil temp gets to 87 deg even though engine temp shows steady 90 deg. The engine temp did not go over 90 deg and did not overheat.
Looks like i only get heat with thermostat in place but have fluctuating eng and oil temp and closed thermostat.
I seem to have the only car not to overheat............
Am i missing something
