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Old 02-22-2000, 06:28 AM
JRBrown JRBrown is offline
Join Date: Jan 2000
Location: Maryland. USA
Posts: 180

HVAC won't maintain a set temperature.

Ran through job 601 (Quick Test without tester) and zero faults. Works like a champ. BUT, it doesn't evaluate "quality"

Moved on to job 609 (Testing ambient, in-car and potentiometer). They all check within limits.

Checked In-car sensor for air flow pulling through. It checks okay.

I'm left with job 611 (Balancing of sensor chain). I suspect it will check okay since it simply measures the three resistors in series.

So, assuming I'm stumped to here, is it:
Amplifier (any quick checks)
Regulating Valve (only 3 yrs old) (any quick checks)
Or, what else?

Obviously I don't have the tester. I was thinking of locating the pin that sends control voltage from the amplifier to regulating valve and then run a "quality type check to see what voltages are being sent. I am aware that the amp can send out of spec voltages that can damage the reg valve.

Thoughts and help very much appreciated.

80 450 SEL
86 280 GE
81 Vovlo
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