i would suggest putting a new thermistat in. it only takes about 30 minutes to do and the part is cheap
An AW4 transmission from a 1991 Jeep Cherokee will not fit into a 1988 Jeep Cherokee. The transmissions in the varying years do not appear to be compatible with one another.
The HeaterTreater is an after market kit that solves heater and AC for the Jeep Grand Cherokee and Laredo. It is much cheaper than the dealership fix and is easy to install. For diagnosis and info, check out www.heatertreater.net or search eBay for "heatertreater".
Yes you can
The transmission oil line from a 1991 model of a Jeep Cherokee will fit a 1988 model of a Jeep Cherokee because the transmission oil line fits all Cherokee models that were made between 1987 and 1996.
What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?
Blend door probably broke inside the HVAC box.
If a Jeep Grand Cherokee's air conditioner is not blowing any air it could mean that the blower motor has went out. Also the AC controls could be bad.
Mine Does
It was an option
One of the reasons a 2000 Jeep Cherokee heater would randomly blow cold air and then hot air and then cold might be that there is a problem with the hot/cold duct. The air or a vent might be inadvertently blowing periodically.
There are several things that can cause heater problems in your 1998 Jeep Grain Cherokee. The most common cause of heater problems is low fluid in your cooling system.
About $600