I've got a 1997 Suburban and would love a complete list of items to troubleshoot a heater that doesn't work. What I've checked/done so far: blower motor is OK can switch from defrost/feet/face there's coolant in the system - had to replace some hose, and there was a broken 45 degree heater hose connector that I replaced. There's still a small coolant leak past that - probably on the hose that goes to the rear heater (I can't seem to find a replacement online for that) both front/rear blows cold the vacuum hose from the heater valve is pulling a vacuum, but not sure how to test the valve itself How can I check the heater valve, and what else should I check to rule in/out problems with the heating system?

How do I diagnose heater problems on a 1997 Chevy Suburban?

I’ve got a 1997 Suburban and would love a complete list of items to troubleshoot a heater that doesn’t work.

What I’ve checked/done so far:

blower motor is OK
can switch from defrost/feet/face
there’s coolant in the system – had to replace some hose, and there was a broken 45 degree heater hose connector that I replaced. There’s still a small coolant leak past that – probably on the hose that goes to the rear heater (I can’t seem to find a replacement online for that)
both front/rear blows cold
the vacuum hose from the heater valve is pulling a vacuum, but not sure how to test the valve itself

How can I check the heater valve, and what else should I check to rule in/out problems with the heating system?

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