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Operating Temp when Towing

8489 Views 25 Replies 14 Participants Last post by  Rossco
Operating Temperature
I have just purchased a new Touareg V6 180. Have done 4500km now. I recently towed our caravan which is not big 15' to South Australia a one day 800km trip approx. it was a warm day 37c degrees plus. I noticed the temperature gauge that always sat at 90 degrees continually fluctuated between 90 and 105 (still in the normal range but at the high end). I have never experienced this with my other tow vehicles (Land Rover discovery & Nissan Pathfinder). I was towing at 100kph. The car was fantastic and did the job with ease, but I have a question re the temp gauge movement. Is this normal? Have other owners who tow experienced this. The manual does say the vehicles operating temp will be effected by outside ambient temperatures. Advice from the technical people at the VW dealership say this is normal, but as I have said I have not owned a vehicle that has had the temp gauge continually go up and down like this? I would appreciate feedback from others who may have experienced this. As I purchased the Touareg primarily for a tow vehicle and will probably being towing when the ambient temperature will be 35c plus often, I would like some assurance all is ok?
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After reading through the this thread I decided to add my experience. I own two Tregs (T1 and T2), both have towed several trailers. Neither have experienced the coolant temp gauge moving beyond their "fixed" or "normal" maximum. As others have said, yes the actual temp does change, but these gauges generally don't report it unless something is afoot.

My T2 currently tows an over 6k lbs, 32' in length, travel trailer. We have loaded the Treg to near max GVWR in summer heat above 100 fahrenheit and not had the temp gauge budge. Naturally no reflection of reality, but if mine did move I would suspect something being wrong....because it isn't made to do what yours (OP) is doing. Sounds like you may have a partially sticking thermostat or a bad sensor...or...?
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