Monovalve Replacement

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Project Box
Part Number(s): 1147213007(Bosch)or 3065 (MTC)
Part Cost: $40 (Bosch) or $27 (MTC)
Best Place to buy: Autohaus
Cost to Have it done in a shop: $ ?
Difficulty Level: 2
How long it may take: 0.25 hours
Frequency: Whenever your heat is not working right (and your aux pump and water pump and thermostat is ok)
Tools needed: Philips screwdriver (a 90* one may be useful)
Special tools needed:


This is very simple to do:

1. Find this: It's a few inches away from your battery on the firewall.


2. Remove electrical connector off

3. Unscrew the four screws, lift top off a bit coolant WILL spill out (about 1 cup)

You will see that the monovalve gasket is probably broken.

4. Now just press out the old Monovalve (from the top, just press on the little silver monovalve downward) keeping everything in order. You just have to slide it out, it does take a some effort. Replace the little funny wavy gasket (yes, this is the technical term) and slide back in the new Monovalve.


That's it. Drop it back into it's housing, tighten up the four screws and reconnect the wire.