WOT Posted February 14, 2011 Share Posted February 14, 2011 Few things have lead me to believe I may need to replace the waterpump on my VQ35DE. First I noticed my radiator doesnt seem to be evenly as hot to the touch, say I have the motor running from cold for 10 minutes, the upper rad hose is HOT, the lower rad hose is warm but not near as hot. I also noticed because I was feeling the finned area of the rad where my temp sensor probe is, that when I rev the engine to say 1500-2000rpm the finned area about 3" down from the upper rad neck goes from being able to be touched without feeling hurt, to burning hot and I have to take my hand off within 5 second of revving. Stop the revs, and the burning sensation goes away ( kinda funny ) I also noticed I dont have the greatest heat output at idle, compared to say cruising @ 2000rpm. Coolant level and overflow is fine, radiator/thermostat is new and the heatercore was flushed 2 seperate times this year. So Im curious, are these signs of a failing pump @ 119k miles? Ive only had the truck for 35 but am unsure of its previous maintenace. DO they just "wear down" overtime, or is it a part that either functions 100% or not at all Hard as hell to do? Link to comment Share on other sites More sharing options...
adamzan Posted February 14, 2011 Share Posted February 14, 2011 Does it ever overheat in the summer? My dad had similar winter symptoms and it was the rad that was clogged. Link to comment Share on other sites More sharing options...
WOT Posted February 14, 2011 Author Share Posted February 14, 2011 Was fine last summer. Rad is only about a year old though, its not oem I got it off ebay it seems quite thin, but I dont recall if I compared it to the oem one or not. I just dont like the fact how fast it seems to heat up in the fin area where my probe is right as I rev the engine, almost like the water isnt flowing all over the rad until I do so. I figured the heat would be even Link to comment Share on other sites More sharing options...
shift220 Posted February 14, 2011 Share Posted February 14, 2011 The one thing you didn't mention was the radiator cap. Might be a good idea to check it out, especially if you have an eBay one on there. I don't suspect there is anything on the waterpump that will wear and decrease performance a significant amount. They might a slight bit but then usually will go out soon after. If your not getting heat its either a thermostat problem or a clogged heater core / line. If the truck doesn't overheat, I wouldn't be to concerned. Link to comment Share on other sites More sharing options...
WOT Posted February 14, 2011 Author Share Posted February 14, 2011 Rad cap is new about 2 months ago, its a prestone unit from canadian tire, 13 pounds I believe Am I wrong to think the finned area of the rad should be evenly heated even at idle?? I just dont get why it gets so hot so quick as soon as I rev the engine Link to comment Share on other sites More sharing options...
madhornet Posted February 14, 2011 Share Posted February 14, 2011 actually that is all signs that the pump is good all u need to do is change your thermostat sounds like its sticking open a little Link to comment Share on other sites More sharing options...
WOT Posted February 14, 2011 Author Share Posted February 14, 2011 its brand new oem this year aswell, did a new thermostat, cap , upper and lower hoses aswell as a full flush just before winter Link to comment Share on other sites More sharing options...
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