check the thermostat see if there is one, if there is it may be stuck open.
low engine coolant level, your heater core is at the very top, so if its not full to the very top it wont work. add coolant and bleed system.
Check voltage and plug on your fuel pump relay. Also check the relay (while the engine is running) for heat. Might be a bad ground???
1998 rav4 engine wont idle and clacking noise from under timing belt cover
check all the fuses.
an engine if running usually heats up, are you talking heat in car? need new thermostat
No it wont, only the 2.2l engine's transmission will work with the 2.2l and same goes with the other engine.
no it wont hurt the jimmy
1998 chevy blazer wont start good spark and good fuel presure
You need to make sure that you have transmission fluid. And its level is proper.
Do you mean the check engine light does not come on when you turn the ignition on? Possibly the bulb is burnt out.
1997 ford moterhome E350 with a V10 Triton engine My AC will not switch over to heat
time for a major tune up