diff --git a/blueprints/operational_chemistry/namelist.chem b/blueprints/operational_chemistry/namelist.chem
index 1bf645a514bf147c381cea6da73906f36ebd0a4d..bf3d5e83ce33eba4e0778209713b6c1ca36c3c6b 100644
--- a/blueprints/operational_chemistry/namelist.chem
+++ b/blueprints/operational_chemistry/namelist.chem
@@ -19,7 +19,7 @@
  gaschem_onoff                       = 1, 1,
  aerchem_onoff                       = 1, 1,
  wetscav_onoff                       = 1, 1,
- cldchem_onoff                       = 1, 1,
+ cldchem_onoff                       = 0, 0,
  vertmix_onoff                       = 1, 1,
  chem_conv_tr                        = 1, 1,
  conv_tr_wetscav                     = 1, 1,
diff --git a/blueprints/test_chemistry/namelist.chem b/blueprints/test_chemistry/namelist.chem
index 1bf645a514bf147c381cea6da73906f36ebd0a4d..bf3d5e83ce33eba4e0778209713b6c1ca36c3c6b 100644
--- a/blueprints/test_chemistry/namelist.chem
+++ b/blueprints/test_chemistry/namelist.chem
@@ -19,7 +19,7 @@
  gaschem_onoff                       = 1, 1,
  aerchem_onoff                       = 1, 1,
  wetscav_onoff                       = 1, 1,
- cldchem_onoff                       = 1, 1,
+ cldchem_onoff                       = 0, 0,
  vertmix_onoff                       = 1, 1,
  chem_conv_tr                        = 1, 1,
  conv_tr_wetscav                     = 1, 1,