Search found 4 matches

by thp
Tue Jun 11, 2019 11:45 pm
Forum: Automotive Air Conditioning Forum
Topic: Evap freezing at low fan speeds
Replies: 8
Views: 426

Re: Evap freezing at low fan speeds

Yes, US vehicle. And yes the system was originally fit with a Sanden SD7H15 as you show. A number of online parts houses show the Denso as being compatible, but who knows. I didn't buy it from a specialty AC parts shop (I didn't know about shops like this at the time...) and this is a subtle issue s...
by thp
Tue Jun 11, 2019 2:42 pm
Forum: Automotive Air Conditioning Forum
Topic: Evap freezing at low fan speeds
Replies: 8
Views: 426

Re: Evap freezing at low fan speeds

This system is not meant to cycle. The service manual claims the compressor has an internal pressure regulator, which I assumed was an internal control valve? I haven't looked closely at the compressor recently, but I seem to remember a circular nubbin that looks like one. I'm not running a Sanden, ...
by thp
Mon Jun 10, 2019 9:22 pm
Forum: Automotive Air Conditioning Forum
Topic: Evap freezing at low fan speeds
Replies: 8
Views: 426

Re: Evap freezing at low fan speeds

The charge is dead on. I verified a couple times, including when I changed the TXV. What part looks wacky? I would think the changes from turning on or off the rear AC are expected. When it's on a solenoid opens and you get the pressure drop across the rear TXV and evap added in parallel to the fron...
by thp
Sun Jun 09, 2019 12:00 pm
Forum: Automotive Air Conditioning Forum
Topic: Evap freezing at low fan speeds
Replies: 8
Views: 426

Evap freezing at low fan speeds

Year: 1993 Make: VW Model: Eurovan Engine Size: 2.5, front and rear AC Refrigerant Type: R-134A Ambient Temp: 80F System cools great. However the compressor cycles every ~10 seconds on front evaporator anti-ice switch when blower is set below full blast. Basically the low side drops too low when the...

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