06-20-2013, 02:14 PM
Join Date: Mar 2009
Location: Georgetown, Guyana
So many questions remain unanswered - I hesitate to ask more - what are the fans doing in the 20~50 minute period? At what point do those turn on?
One of the vehicles I owned many years ago would not turn the fan on until the temp gauge was a hair away from the red, at which point the fan would come on pull the them rapidly down to mid scale and switch off, and the cycle would then repeat - and it would only do under two circumstances - in heavy traffic, which was basically every day on my way back to work from lunch, or when used on a rally route, which entailed a fair bit of high rpm, low gear, low forward speed travel (similar to the 4WD in 4L I mentioned previously) - on the open road it ran flawlessly.
My solution was to add a manual over-ride switch - if I hit heavy traffic or when running a router - I would just flip the switch and bring the fan in.
More questions - are you running with OE replacement fan(s) - or are you using one or more generic replacements? Are the fans wired the same way, controlled (switched on/off) the same way, capable of moving the same volume of air?
For what it's worth - I'm not seeing the evidence that the vehicle is overheating - you mention 5psi - I'd expect a lot higher than that with the engine up to operating temperature, you mentioned changing the temp gauge sensor - are you using an OE sensor?
What's the possibility you're looking at a gauge that is giving you an incorrect indication because of an unmatched sensor?
Did you notice my first response suggested you might need an infrared thermometer - that - or a properly calibrated gauge is the only way you're going to know how hot your engine is getting.
98 - 1.8 Mitsubishi Pajero iO
98 - 2.0 Suzuki Grand Vitara - SQ420
05 - 2.0 Suzuki Grand Vitara - JB420
15 - 2.4 Kia Sportage