The 89 wagon sounds like:
Restricted passages in the radiator core.
The 90, sounds like a head just starting to crack. I bought my 92 knowing it had 7 heads put on it.
I took on the project for a mere 100 bucks, I got a junk yard head for $50.00 and had it reconditioned for $75.00 I ran it, saw it got cooler as I moved, but got hot if I went over 60MPH. The head cracked.
I got a 2.0 head and ported it for the injectors to fit from the 2.2 intake, I checked and checked. I found that the bottom half of the radiator was fully blocked by copper stop leak!
I hope this helps?
Refinish King