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The website heatertreater.net has good information on blend door troubleshooting and they also sell components that will fix these issues. Check out their website and see if your heater problems are the same as they describe for your Ram, and also the Sebring.
The upper hose goes to the thermostat housing, and the water pump is under the timing belt cover.
Upstream between the engine and firewall. P0300 - P0305 = misfires on cylinders 1, 3, & 5. Along with replacing the O2 sensors, you might clean or replace the Variable Valve Timing oil control valve filters.
I agree with ProfessorG. Replace the thermostat and gasket with Toyota OEM parts. call a dealership for the part numbers, and check ebay.com for better prices!
Actually 1983 K5 Blazer. 300,000 miles I'd guess, 6.2l diesel, 700r4 auto transmission, Motor is military take out and Trans was rebuilt some 12 years ago by the place I purchased it from. drain and fill twice in last 4 years on transmission fluid with one quart of Lucas fluid conditioner added, recent oil change, tv cable adjusted today after repair on throttle cable connector at db2 injection pump due to excess play. The vibration has been ongoing for a few years so I replaced the TC lockup wire connector at trans due to bare connector wires touching earlier this Summer, and replaced the brake light switch also. The vibration is present after a short drive when I am at a stop light with the brake peddle depressed, but if I momentarily shift to neutral then back to 3rd the vibration goes away. A mechanic adjusted the tv cable this last summer and stated that he thought the tc is staying locked up, and also recommended a new throttle valve cable. Any thoughts on the cause and solution would be appreciated!
Sounds like the EVAP system. First remove the gas cap and clean the filler neck where the cap gasket seals. Next carefully remove rubber o-ring gasket from gas cap and clean the o-ring and sealing area on cap. reinstall the o-ring on the cap, and put the gas cap back on the rav 4. The check engine light should go away after a few days of driving if the leak was at the fuel cap. If the o-ring looks messed up, clean the filler neck and replace the gas cap with a new one.
daycoproductsllc.com website has very good videos on diagnosing drive belt chirp and squeal, and they also have a free worn belt checker tool for free.
An exhaust manifold leak can cause burned exhaust valves, improper fuel trim as the leak introduces extra oxygen that is picked up by the oxygen sensor, and slow warm-up time which also causes high fuel consumption, which will also cause your catalytic converter to fail prematurely, and the exhaust fumes can easily enter the vehicle cabin through the heating system and cause the passengers to get carbon monoxide poisoning, etc,etc. Have the leak fixed pronto!
Check for the leak at the oil pressure sensor also.
The vehicle is actually a 1983 K-5 full size civilian diesel Blazer with a take-out 1984 military 6.2l J code diesel engine with original military DB-2 injector pump that has a slight fuel leak at the throttle shaft, "new timing chain, and head gaskets installed during engine swap two years ago", 4X4, 700R4 trans. The engine acts like the timing is increasing during the surge with more engine rattle, and speed. The truck has a slight vibration at idle in both park and drive gear, white smoke from passenger side exhaust for 10 seconds after startup but no smoke from drivers side, and #4 cylinder has lower compression (250 psi) than the others(around 300 psi). Other than that, it runs very good for a normally aspirated diesel engine. I cleaned all 8 injectors manually DIY. When I turn the engine over by hand I can hear a clicking sound coming from the passenger side of the engine. Since the injector timing is regulated by the fuel pressure inside the injector pump, the throttle shaft leak might be the cause is my guess. All help is appreciated!