2001 Dodge Ram Replaced evaporator, now only defrost.

2001 DODGE RAM
205,000 MILES • 5.9L • V8 • 4WD • AUTOMATIC
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DAVIDJ7479
  • MEMBER
  • 25 POSTS
I had to replace my evaporator (and heater core) this weekend. Air nice and cold, but only defrost. It worked fine before I pulled the heater box.

I have vacuum going into the firewall (right past the check valve).

Without starting I disconnected the vacuum line after the check valve, heard vac for a second and stopped, bypased check valve, no difference.

The I disconnected the vacuum block connector under the dash, started the truck, had strong vac for 2 seconds and died down to nothing.

Pinched line maybe?

Assuming I pinched the hose somewhere, where could I run a new hose so I don't have to pull out the hole box, again? What size hose?

Thanks for your input.
Jul 1, 2014 at 2:07 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
That's exactly what it sounds like, a pinched hose. You can run one anywhere through the firewall. Exact hose size, good question. Chrysler uses some rubber hose, some plastic... Take a section with you to the store to match it.
Jul 1, 2014 at 6:12 PM
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