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RAV-GT4
Forums Junkie

Toymods member
I supported Toymods

Location:
Rydalmere, NSW
Registered:
May 2002

No heat from heater.. ?	Sun, 19 December 2004 01:38

Installed a new thermo-fan yesterday. Had some dramas doing it, like there was a hole in the radiator created by trying to take out the dead thermo-fan. Got some radiator putty and sealed that up ok, installed the new fan, connected it up to pull heat out of the radiator (the same as the other fan does), swapped over the coolant after reconnecting up all the lines, etc. After we got over all the radiator fan drama, we did some initialising of the Power FC like running it on normal idle for 10 minutes, running it under full electrical load and at idle for 10 minutes, etc. Took it out on the road and the temp gauge seemed to be in the "normal" range for my 71°C thermostat. Gave it a bit through the gears while making corrections to the ECU's tuning (thanks to Ben at BEL Garage) and the gauge was rising... the same was happening on Ben's Laptop as he was tuning it. We decided to take it out on the M4 to try and give it some cool air through the fans. The ECU light starts blinking at me, then flashing madly and soon after the engine starts pinging it's tits off. We pull over to see if the fans were ok and everything was good, and there wasn't a leak to be seen, and the new thermo-fan was still in good shape. We turn off the Burnett St. exit and get back on the M4 the other way to head back to the Garage. On the return trip we were using the standard 3S-GTE ECU as the Power FC wouldn't let us take the car any further if it got over 100°C engine temp (it was at 125°C), and the intake air temp was at 65°C. So after the car cooled down a little (on ignition the fans were doing their job of pulling heat out of the radiator), we headed back. The car was still very hot on the way back, so I decided to turn on the heater to extract a bit of the engine heat, since it worked before the new fan was replaced. I was a bit surprised to find out that there was no heat coming from the heater! The strange thing is that (as far as I know) none of the heater connections were touched in the process of changing over the thermo fans or radiator coolant. I checked it over again last night before heading home from BEL (after letting the engine go completely cold), and there were still no leaks and everything seemed to be fine. I had the Power FC hooked in for the drive home, and I was monitoring the readout on the hand controller for the engine temp, and I had it going VERY easy on the drive home. The inj. duty was never more than about 7% and I tried keeping the revs as low as possible on the gears. For a while it was sitting at about 73-74°C (normal), but after sitting at a few sets of lights the temp went up every time the car took off, no matter how lightly I drove off. After the temp got above 80°C, I hit the heater fan and it pushed out nothing but cold air, and the temp gauge was skyrocketing. I had to pull over to let it cool down again. By the time I got home, the final temp was at 100°C. I don't know what's causing this but I need a possible fix for it ASAP. Any ideas? FYI, the radiator is still working, it's not a BHG situation and coolant does splash out of the reserve bottle when it overheats. I don't know about the radiator cap though, it seems to still be good. [Report message to a moderator]

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