Question about 1988 Audi 90

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1988 Audi 90

Which would make more sense? Replacement or rebuild? Thanks

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  • wosmo Jun 12, 2008

    Thanks! It's not what I wanted to hear, but I needed to know. I appreciate the help!



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It would be alot cheaper to find a known good one rather than rebuild what you have. It is very expensive to rebuild one of these transmissions.

Posted on Jun 12, 2008


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1 Answer

How do i remove the heater core from a 1988 audi 90? ... my heater core blew and i was wondering if i can get to it from under the dash or if i will have to remove the entire dash to get to it?

If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Dec 27, 2010 | 1988 Audi 90

1 Answer

My 1988 audi 90 does not hold 2nd 3rd pr 4th gear. I have taken the bracket off on top and shifted with the rod and still no good. It is finding the gears just not holding them. What could it be?

There are a few reasons why that can happen, most likely the input shaft to the transmission has too much play or wobble in it from a worn out pilot bearing/bushing, the main bearing is worn out, or the synchronizer keys are damaged or worn out and no longer holding, or the shifter rod de-tents or springs are worn out. The only thing that might be repairable without removing the transmission would be worn out shifter de-tents or springs.

May 02, 2010 | 1988 Audi 90

2 Answers

Need a timing belt diagram for a 1993 audi 90 quattro please hlep

I am not sure if you have the 90 or the 90 Quattro.
Click on the below Links.
The first Link is all the Diagrams on the Timing Belt for the 90 Model.
The second link is all the Diagrams on the Timing Belt for the V8 Quattro.
Before clicking, let me know if this helped you.
For the 90 Model:

For the V8 Quattro:

Jan 31, 2010 | 1993 Audi 90

1 Answer

1988 Audi 90 overheat signal flashes on the dash

2 possible causes. The most likely is a bad multi-function temperature switch (MFTS.) This sensor is located at the front of the engine, on the lower portion of the water inlet neck (where the radiator hose enters the cylinder head.) The MFTS has a four prong connection, and points downwards. As always, check the wiring associated with this switch to make sure there are no bad wires or connections.

Other possible cause is low water level in the overflow tank.

Aug 10, 2009 | 1988 Audi 90

1 Answer

Audi 90 1988 timing problems

there wil be a mark on your camshaft, alternator, igniton coil and driveshaft and on the motor block for each one of them, set them over there and then put the timing belt on, still i would take it to a mechanic for this, because if you do this wrong you might break off a valve inside one or more of the cylinders and that would be more expensive then to have it done right the first time.

Mar 10, 2009 | 1988 Audi 90

1 Answer

Where is the thermostat located in 1993 audi 90, can i have picture

It is located on the front of the motor under the timing cover, behind the timing belt. Usually this is replaced along with the timing belt job and the water pump. If you follow the radiator hose up from the radiator on the right side it's up where it goes into/behind the cover.

Mar 10, 2009 | 1988 Audi 90

1 Answer

Can't find thermostat location on 1988 Audi 90.

Hi Lol,
I'm not an Audi specialist however if you follow the top hose from the radiator to the engine block the thermostat housing on most engines is at the end, it may have 2 nuts or bolts securing it.
I hope you are now sorted if not please come back to me and I'll try to get my head under the bonnet/hood of a 90 to find what you seek.
Please remember to rate my efforts,
Paul 'W'
Onyer~EDson(:0) {#><U.K.

Jan 19, 2009 | 1988 Audi 90

1 Answer

88 Audi dash and back up lights not working

on the clocks you have 2 buttons.i cant remember which 1 but 1 ov them turns the brightness up.

Jan 01, 2009 | 1988 Audi 90

1 Answer

1988 90 Quattro transmission

Most likely a one of the two shafts that carry the gears in the inside of the gear box has fallen down. The cause of this, is the bearing at the front of the shaft has worn out and the shaft dropped. The gears are unable to mesh anymore.

Jun 10, 2008 | 1988 Audi 90

2 Answers

1988 Audi 90 electric windows stop working

Perhaps it is a problem for an auto electrician. 30 minutes is enough time for a built up charge to dissipate, The charge/short circuit it is causing is not enough to blow the fuse however, since it works after letting the charge clear.
There is no response at all? it doesn't go half way up then stop etc?

May 25, 2008 | 1988 Audi 90

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