Help - I have a 302 GMC six cylinder that is overheating when cruising or after negotiating multiple stoplights. I have changed fluid, put in new 160 degree thermostat (it didn't have one before) added two bottle of water wetter, left my electric fans on all the time and it still gets too warm. My fans are ahead of the radiator. I have read that they should be behind the radiator but there is not enough room as the GMC motor is longer than the Chevy six.

Any ideas out there?