Step 5- Modifying The Evaporator Canister


This modification is for A/C equipped Miata's only. If you do not have A/C, skip this step and continue on to Step 6. Depending on the thickness of your radiator you may be required to bend the upper A/C mounting tab and use the supplied Tie-Wrap setup in STEP 10. On stock radiators you can use the supplied spacer and bolt to support the upper A/C evaporator coil.

5.1 Modify The A/C Mounting Tabs

The upper mounting tab on the front passenger side may need to be bent depending on your setup for the A/C dryer tube for additional clearance.

  • Bend the upper radiator tab on the passenger side close to flat or until there is enough clearance for the A/C dryer tube as shown in Photo 5-D.  This tab bends pretty easily. 
  • Use a combination of pliers and Crescent wrenches to push it over as shown in Photos 5-A through 5-C .
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Photo 5-A: Bend the upper tab Photo 5-B: Finish the bend of the upper tab using pliers Photo 5-C: Tab should be near flat
 
Photo 5-D: Upper tab flat. Lower tab before bend    

5.2 Modify the A/C Evaporator Coil Models 90-93

The A/C dryer canister needs to be bent to allow clearance for the intercooler, take caution when bending the A/C dryer and bracket. Section 5.3 shows details using a Crescent wrench to aid bending. 

  • Remove the 10mm bolt holding the A/C tube as shown in Photo 5-E.
  • Grind or Saw Cut the A/C dryer bracket to increase bending radius as shown in Photos 5-G through 5-J. Be sure to cut both top and bottom.
  • Unscrew the bolt holding the top A/C tube as shown in Photo 5-K.
  • Use a large Crescent wrench and clamp it to the aluminum bracket as shown in Photos 5-O and 5-P. 
  • Stick a screwdriver through the hole at the end of the Crescent wrench for leverage and rotate. The bracket will bend around.
     
  • Rotate from the top and bottom as you bend in small increments until the canister has rotated a little less than 90 degrees.
     
  • Don't overdo it. Bend in small increments, making sure you don't damage anything. You might have to go back and add a little more bend after the intercooler is in place to get good clearance. You do not want the A/C unit and the intercooler to rub.
  • Saw cut the bracket as shown in Photos 5-L and 5-M for additional intercooler pipe clearance.
Photo 5-E: Remove 10mm mounting bolt holding A/C tube Photo 5-F:Saw cut into bracket Photo 5-G: Grind upper and lower area in the bracket for bending
Photo 5-H: Saw cut alternative into bracket Photo 5-I: Notch out saw cut Photo 5-J:Saw cut bottom bracket
Photo 5-K: Unscrew top A/C tube bracket Photo 5-L: Saw Cut bracket to remove it Photo 5-M: Bracket removed for pipe clearance

5.3 Modify the A/C Evaporator Coil Models 94-97

The later Miata had a different A/C evaporator coil and dryer canister configuration, but bending is similar. Take caution when bending this A/C dryer and bracket. 

  • Remove the 10mm bolt holding the A/C tube as shown in Photo 5-N.
  • Use a large Crescent wrench and clamp it to the aluminum bracket as shown in Photos 5-O and 5-P.
     
  • Stick a screwdriver through the hole at the end of the Crescent wrench for leverage and rotate. The bracket will bend around.
     
  • Rotate from the top and bottom as you bend in small increments until the canister has rotated a little less than 90 degrees.
     
  • Don't overdo it. Bend in small increments, making sure you don't damage anything. You might have to go back and add a little more bend after the intercooler is in place to get good clearance. You do not want the A/C unit and the intercooler to rub.
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Photo 5-N: Remove 10mm mounting bolt holding A/C tube Photo 5-O: Use a Crescent wrench to bend the bottom of the bracket Photo 5-P: Use a Crescent wrench to bend the top of the bracket
Photo 5-Q: A/C dryer should look similar to this photo when bent Photo 5-R: Top view of bent A/C dryer  

5.4 Modifying the A/C Evaporator Coil Upper Brackets

The condenser coil is supported using the lower support brackets in the factory position and either a mounting bolt and spacer or a Tie-Wrap setup for the upper half. In STEP 10 we will complete the upper support for the evaporator coil.

  • If the the A/C evaporator coil lower hardware was removed, reinstall in the factory position as shown in Photos 5-F and 5-S. using factory hardware.
  • Mount the evaporator coil toward the front side of the frame bracket as shown in Photo 5-S.
  • Bend the upper tabs at an increasing angle toward the engine to act as a stand-off. Bend the tab back flat as shown in Photos 5-T and 5-U to increase surface contact against the radiator. You should have approximately 1/2" or more space between the radiator and the condenser coil when complete.
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Photo 5-S: Attach the evaporator coil to the lower frame tabs Photo 5-T Bend the upper tab toward the engine Photo 5-U: Bend the tab back flat to increase surface contact
Photo 5-V: Bend the tabs to get approximately 1/2" of space    

Next - Step 6: Installing The Radiator Shroud Panels

Step 1: Removal Of Factory Parts Step 8: Installing The Power Steering Cooler
Step 2: Modifying The Radiator Brackets Step 9: Installing The Radiator
Step 3: Modifying The Radiator Cross Member Step 10: Installing The A/C Evaporator Coil To The Radiator
Step 4: Installing The I/C Mounting Support Panels Step 11: Installing The Intercooler Pipes
Step 5: Modifying The Evaporator Canister Step 12: Installing The Lower Radiator Panels
Step 6: Installing The Upper Radiator Shroud Panels Step 13: The Final Adjustments
Step 7: Installing The Intercooler Index: Introduction

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