The water pump latch relay has a sticking solenoid, sometimes it works and sometimes it won't so I ordered a new one.
Purchases lr35 relay off Amazon, lasted one month. I returned free for refund. Got napa Echlin ar284 twice the price. Still plastic,and had to tape square cover down,as it was coming off rear plate. I hear the original metal vw brand relay is like 65dollars?
So far ok with Echlin
This is the one I used.
https://www.newark.com/finder/20-21-9-012-0000/contactor-spst-no-12vdc-din-rail/dp/08X7043
Mark
Mark that's the same one that was in my coach and I ordered the same one from the same supplier only the Canadian site.
If your model takes the VW bug latching headlight relay, there is an old post with all the x-refs on it. Here is one that will work: NEW HEADLIGHT RELAY 111-941-583EC FOR VW BEETLE, KAMANN GHIA, THING,... (https://www.ebay.com/itm/NEW-HEADLIGHT-RELAY-111-941-583EC-FOR-VW-BEETLE-KAMANN-GHIA-THING-TRANSPORTER-/222099903229)
Or the real thing and no where near $65. Only $28 plus $3.85 shipping. The is the metal German OE: NOS VW OE Headlight Dimmer Relay w/attachment clip, 111-941-583, Made in... (https://www.ebay.com/itm/NOS-VW-OE-Headlight-Dimmer-Relay-w-attachment-clip-111-941-583-Made-in-Germany/383800379249?hash=item595c490771:g:ZMEAAOSwMp9fpr2W)
This is about what I paid years ago.
Pierce