diff --git a/code/ATMOSPHERICS/components/unary/cold_sink.dm b/code/ATMOSPHERICS/components/unary/cold_sink.dm
index e5305876ed..9fcdad8613 100644
--- a/code/ATMOSPHERICS/components/unary/cold_sink.dm
+++ b/code/ATMOSPHERICS/components/unary/cold_sink.dm
@@ -43,6 +43,13 @@
 			node = target
 			break
 
+	//copied from pipe construction code since heaters/freezers don't use fittings and weren't doing this check - this all really really needs to be refactored someday.
+	//check that there are no incompatible pipes/machinery in our own location
+	for(var/obj/machinery/atmospherics/M in src.loc)
+		if(M != src && (M.initialize_directions & node_connect) && M.check_connect_types(M,src))	// matches at least one direction on either type of pipe & same connection type
+			node = null
+			break
+
 	update_icon()
 
 /obj/machinery/atmospherics/unary/freezer/update_icon()
diff --git a/code/ATMOSPHERICS/components/unary/heat_source.dm b/code/ATMOSPHERICS/components/unary/heat_source.dm
index db046e7974..e139f6faf3 100644
--- a/code/ATMOSPHERICS/components/unary/heat_source.dm
+++ b/code/ATMOSPHERICS/components/unary/heat_source.dm
@@ -39,11 +39,19 @@
 
 	var/node_connect = dir
 
+	//check that there is something to connect to
 	for(var/obj/machinery/atmospherics/target in get_step(src, node_connect))
 		if(target.initialize_directions & get_dir(target, src))
 			node = target
 			break
 
+	//copied from pipe construction code since heaters/freezers don't use fittings and weren't doing this check - this all really really needs to be refactored someday.
+	//check that there are no incompatible pipes/machinery in our own location
+	for(var/obj/machinery/atmospherics/M in src.loc)
+		if(M != src && (M.initialize_directions & node_connect) && M.check_connect_types(M,src))	// matches at least one direction on either type of pipe & same connection type
+			node = null
+			break
+
 	update_icon()
 
 
diff --git a/code/modules/reagents/Chemistry-Reagents.dm b/code/modules/reagents/Chemistry-Reagents.dm
index d77f7b412f..0df72664fd 100644
--- a/code/modules/reagents/Chemistry-Reagents.dm
+++ b/code/modules/reagents/Chemistry-Reagents.dm
@@ -51,7 +51,7 @@
 		return
 	if(!affects_dead && M.stat == DEAD)
 		return
-	if(overdose && (dose > overdose) && (location == CHEM_BLOOD))
+	if(overdose && (dose > overdose) && (location != CHEM_TOUCH))
 		overdose(M, alien)
 	var/removed = metabolism
 	if(ingest_met && (location == CHEM_INGEST))