pickuptrck

My new-ish (to me) can run in mydriveway for 10 minutes & never overheat. When I pull it out on the road, I'm just underredline temps within 2 minutes while under 1/8 throttle (mostly 25 MPH roads @ 2nd gear on base). When I let off the gas, it'll take about 10 seconds of coasting, and it comes down about 3 needles worth, still too high.I just replaced the water pump (new gaskets & Blue RTV all around), new 180 degree thermostat, new serpentine belt & new fan controllerto try and solve it, but no luck, same problems.

The new fan controller never turns on (I turn it on manually with the override switch) & the radiator is SLIGHTLY warm to the touch whent the gauge shows overheat temps, but it's never hot. Theupper hoseis normal temp, the lower hose is warm at best. The rear water pump gasket will leak slightly when it overheats, but it's all new, I assume it's just giving slightly to relieve pressure. It doen't drip when Idling - only after driving.

Have I blown my headgaskets?? The gasket surface I can see looks near new. WHere do I start and what do I need?

Thanks for the help.

tmajikman

Have you got the car heated up and then checked for any cool spots ont he radiator... Shut the car off first before you check. You may need a new radiator if it is not flowing very well.

AdderMk2

rad is probably no good, and did you get the correct water pump, i.e, is it turning in the appropriate direction

koesterca1

Sometimes lower radiator hoses collapse under load.When you let off the gas the hose opens back up and lets the cooler fluid back into the engine.

mustangsally93

^^^^ I have never heard that.

LTnone

When you say it can idle for 10 min and be fine.... is that when it's already warm?