Look if it is in the heater joints and the tubes that go asia the fire wall This union is up to the pedals (brake, accelerator, cloutch) they wear round rubber packages are replaceable.
If it is a lot of roll for you on the side of the driver side engine on the fire wall you will see the two handles of the heating disconnects and unite them by means of a tube I create the measure is 5/8 with this the problem is over but you will not have heating here in Cancun is very rare that algien repairs or changes the heating is a tropical sound apart from that they are expensive.
Do not create problems apart is cheap and in 20 minutes you already canceled the heating now if you are in an area where any season is cold or ways to disburse.
Now returning to the beginning I mention the 2 gums in the unions this would have to be someone with experience because it is a little complicated; The other is that the heater there is a change, there is no other change I hope it has been helpful.