Hi, so i've got a 2.8T isuzu mu, since ownership heaters worked fine, temp gauge would only sit quarter way but it didn't bother me.. everything worked well! I replaced thermostat at this point for peace of mind (figured maybe it had been removed or slightly old). So thermo is brand spanking new. 3 weeks ago I got a diesel leak from the inside cap of diesel pump, my mate and I removed intake, all water lines and everything to get to it. It worked, we fixed the leak and its great.
BUT now the damn heaters wont work haha, I've checked for pics of my lines to make sure they are in the correct order and they are from what I can see. The heaters DO work but Only when going 100kmh for 10 minutes or more.. I can drive around town all day at 50kmh and its dead cold. Temp gauge also sits at half way now (Which doesn't bother me, its no where near over heating), uses no water or anything at all. running great, just heaters.. So if I go 100kmh and then arrive back in town for example after about 10 minutes of 50kmh around town driving the heater will slowly get colder haha..
Any ideas at all?? Ive also tried bleeding the system the usual way, but it took 40 mins to get to temp at 3000rpm with choke on.. lol not even kidding! and the heaters started working after that? but it took 40 mins. please help, any help is much appreciated, ive asked everyone I normally ask for help and same answers generally which ive checked it all..
Thanks very much guys