OK, did some more researching and found out that I had the radiator fan motor burn out on me. Replaced it today and now I have normal operating temperatures until I turn the A/C on. If I am sitting at idle without it on, I have normal temps. When I turn the A/C on, the temp gauge goes from normal to about 25% hotter until I start to move, then it cools back down to normal. I also am smelling the coolant while sitting. Checked to see if there were any leaks anywhere and all I have is condensation from the a/c under the car. my guess now is its either the switch or the thermostat itself going bad. Anyone have any other suggestions??

 

Are both fans coming on when you turn the a/c on?

 

yes they are.

 

Hmmm, I'd check the thermostat like you said and also, check for ANY small leaks. The hoses tend to get cut after time and start causing problems.

 

I had the same problem with my 420a back in the day...i had to replace the theromstat...then a week after that i had a pool of coolant under my car cause my radiator blew up....those plastic radiators tend to crack real easily...maybe you should inspect that as well.... just my .02

 

im having the same problem but i kind of melted one of my fans with the down pipe..... so im just waiting to replace that fan ...

 

Thanks for the info, just to let you know I have a fluidyne radiator and its only a little over a year old. So far I've drained the coolant and re-filled, checked all the hoses again and they are fine, One thing I did notice is that now obviously both fans are on when I turn on the a/c but it doesnt kick on to once it hits operating temps and the a/c is off. I've checked all the fuses, in the engine bay and under the drivers side dash, and none are busted. I know there should be a sensor someplace but I cant find it anywhere to check for it being faulty. Can anyone point me in the right direction?? Also I am just curious but would the heat from an unheat wrapped DP being so close to the thermostat housing on the 420A, cause any issues with the thermostat reading higher than normal temps?? I have never had that problem before but its just a thought. Thanks for the help everyone

 

Well, I think I found the culprit....so far I have changed out the radiator fan motor, checked fuses and bought a new engine coolant sensor and thermostat all to find this....




The hunt is on for a water neck now.

 

hector, if you cant find one i'll make a trip to the salvage yard for ya again. lmk

 

I appreciate that Brandon but I was able to order 2 from satan for $16. Trust me, we most likely will do a junkyard run soon LOL